CN114894435B - Device and method for visualizing fluid in branch-type channel under ocean condition - Google Patents
Device and method for visualizing fluid in branch-type channel under ocean condition Download PDFInfo
- Publication number
- CN114894435B CN114894435B CN202210497664.8A CN202210497664A CN114894435B CN 114894435 B CN114894435 B CN 114894435B CN 202210497664 A CN202210497664 A CN 202210497664A CN 114894435 B CN114894435 B CN 114894435B
- Authority
- CN
- China
- Prior art keywords
- experimental
- branch
- storage tank
- ocean
- liquid storage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
- G01K13/02—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow
- G01K13/026—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow of moving liquids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Indicating Or Recording The Presence, Absence, Or Direction Of Movement (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The invention discloses a fluid flow mixing visualization experimental device in a branch channel under ocean conditions, which comprises: the system comprises an ocean condition simulation platform, a visual experiment section, an optical measurement system, a three-dimensional positioning rack, a liquid supply system, a temperature control system and an experiment parameter on-line monitoring system; the optical measurement system comprises a laser generator, a CCD camera, a lens component and a remote computer; the liquid supply system is used for realizing the circulation of working media and is matched with the temperature control system and the experimental parameter on-line monitoring system to realize the required experimental working conditions; the CCD camera of the optical measurement system is fixed on the ocean condition simulation platform in parallel with the visual experimental section through the three-dimensional positioning rack and moves synchronously with the ocean condition simulation platform. The invention also discloses a visualized experimental method for fluid flow mixing in the branch-shaped channel under the ocean condition, which can visually obtain the characteristic of fluid flow mixing in the branch-shaped channel under the ocean condition in real time.
Description
Technical Field
The invention relates to the field of experimental research on ocean nuclear power and fluid flow mixing characteristics in branch-type channels, in particular to a visual experimental device and method for fluid flow mixing in branch-type channels under ocean conditions.
Background
The ocean nuclear power platform is used as the organic combination and innovation application of ocean engineering and nuclear power engineering, can provide reliable energy guarantee for building strong offshore force, and can meet the requirements of ocean oil gas exploitation and energy supply of remote islands. The branch-shaped channel is used as a common pipeline structure in the ocean nuclear power platform, and when different branch pipes are used for conveying liquids with different temperatures, cold and hot fluids are mixed in the branch-shaped channel, and a flow field and a temperature field fluctuate. The ocean nuclear power platform is affected by ocean conditions, the ocean nuclear power platform swings, fluctuates and the like, the fluid flow in the branch-shaped channel is mixed to generate additional inertia force, the fluctuation of an internal flow field and a temperature field is further enhanced, and then the internal flow field and the temperature field are transmitted to the pipe wall, so that the pipe wall is subjected to the effects of thermal stress, impact stress and pressure stress, fatigue damage accidents can be caused on the pipe wall of the branch-shaped channel due to the long-term stress effect, and the safe operation of the ocean nuclear power platform is threatened. Therefore, it is necessary to conduct experimental investigation of the mixing characteristics of fluid flow in a branched channel under marine conditions.
At present, experimental researches on fluid flow mixing in branch channels have been carried out at home and abroad. The flow in a branch channel, which is typically composed of a main pipe and a branch pipe, is measured by an optical instrument. However, the influence of the ocean conditions on the fluid flow mixing in the branch-shaped channel is not considered, and the space-time evolution characteristics of the flow field and the temperature field in the branch-shaped channel under the ocean conditions cannot be obtained.
The prior patents CN106248673, CN109696295 and CN112881386 provide a bubble dynamics visualization experiment device and method suitable for dynamic movement conditions, wherein an experiment device main body is a visualized narrow-channel experiment piece, and a single or two high-speed cameras are used for shooting bubble dynamics behaviors under the dynamic movement conditions. The method relates to the technical field of bubble dynamics research under dynamic motion conditions, and can only study the generation, separation and other phenomena of bubbles, and is difficult to study characteristic parameters such as the speed, temperature, spatial structure and the like of the bubbles. And simultaneously, a single or two high-speed cameras are adopted for shooting, so that the dynamic behavior of bubbles in a two-dimensional space can be studied only.
The prior patent CN109473187B provides a visual experiment system and method for mixing two fluids and heat transfer characteristics under ocean conditions, the main body of the experiment device is a visual semi-ellipsoidal two-dimensional slice structure, two fluids which are mutually insoluble are adopted as a melt simulator, the mixing process of the two fluids under the ocean conditions is shot by a high-speed camera fixed on the ground, and the heat transfer characteristics of the two fluids under the ocean conditions are obtained by a thermocouple. The invention relates to the technical field of research on stirring characteristics of a layered melting pool of a lower end enclosure of a pressure vessel after a severe accident of a nuclear power plant under ocean conditions, wherein an experimental device main body is of a semi-ellipsoidal two-dimensional slice structure, two mutually-immiscible fluids are stirred and mixed in a closed semi-ellipsoidal cavity, a high-speed camera is fixed on the ground, the stirring process of the two fluids under the ocean conditions cannot be monitored in real time, meanwhile, the temperature is sampled by a thermocouple, and the spatial distribution of a temperature field cannot be obtained.
In summary, the existing documents and patents are limited by the one-dimensional flow field and temperature field measuring method, two-dimensional and three-dimensional effective information of the flow field and the temperature field after fluid mixing in the branch-shaped channel cannot be obtained, the two-dimensional and three-dimensional effective information is limited by the position relation between the optical measuring equipment and the experimental device, and the influence rule of ocean conditions on the flow mixing characteristics in the branch-shaped channel cannot be accurately obtained in real time. Meanwhile, the existing branch-type channel visual experimental device is unreasonable in pipeline optimization, and the high efficiency and safety of the experiment cannot be guaranteed.
The invention relates to the field of experimental research on fluid flow mixing characteristics in marine nuclear power and branch channels, in particular to a device and a method for visualizing fluid flow mixing in a branch channel under marine conditions. And the simulation of various complex ocean motions is realized through the ocean condition simulation platform. The three-dimensional positioning rack is designed, the requirements of movement of the CCD camera in the three-dimensional direction and rotation of the CCD camera in the circumferential direction are met, adjustment of the position and the size of a measurement area in the overall situation of the visual experimental section is achieved, and real-time performance and accuracy of measurement are guaranteed. Four CCD cameras are arranged in a cross shape, are symmetrically arranged on two sides of a visual experimental section, and can accurately obtain two-dimensional and three-dimensional flow field and temperature field information after fluid in a branch channel is mixed under the ocean condition in real time by utilizing an optical measurement technology. Meanwhile, through the cooperation of the liquid feeding system and the temperature control system, the switching between a cold state experiment and a hot state experiment can be realized, the experiment flow is simplified, the experiment efficiency is improved, and the experiment safety is ensured.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a visual experimental device and a visual experimental method for fluid flow mixing in a branch-shaped channel under the ocean condition, which can visually study the characteristic of fluid flow mixing in the branch-shaped channel under the ocean condition in real time.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the utility model provides a branch type in-channel fluid flow mixes visual experimental apparatus under ocean condition which characterized in that experimental apparatus includes: the system comprises an ocean condition simulation platform, a visual experiment section, an optical measurement system, a three-dimensional positioning rack, a liquid supply system, a temperature control system and an experiment parameter on-line monitoring system; the optical measurement system comprises a laser generator, a CCD camera, a lens component and a remote computer; the liquid supply system is used for realizing the circulation of working media and is matched with the temperature control system and the experimental parameter on-line monitoring system to realize the required experimental working conditions; the key components of the optical measurement system are fixed on the ocean condition simulation platform in parallel with the visual experimental section through the three-dimensional positioning rack, synchronously move with the ocean condition simulation platform, synchronously shoot trace particle images in the branch-type channel under the ocean condition in real time, and obtain the evolution characteristics of the flow field and the temperature field in the branch-type channel under the ocean condition in time and space.
The ocean condition simulation platform consists of a platform table top, a servo control system and a driving shaft; reserving a square through area on the platform surface so as to facilitate the laser to illuminate the visual experimental section, wherein the size of the through area is larger than that of the visual experimental section; the driving shaft is rotationally connected with the platform surface, and the servo control system can control the driving shaft to move so as to drive the platform surface to move and rotate in the three-dimensional direction, so that the simulation of ocean conditions is realized; the ocean condition simulation platform can realize six-degree-of-freedom independent movement and independent degree-of-freedom compound movement and can be in a long-time static state at a specified angle.
The visual experiment section comprises at least one branch structure formed by connecting two pipelines, is arranged above a through area of the ocean simulation platform through a pipeline fixing frame, is parallel to the center line of the ocean simulation platform and is parallel to a three-dimensional positioning rack; the cross section of the pipeline can be rectangular, circular or elliptical, and the pipeline is made of light-transmitting and plastic materials.
The tracer particles of the optical measurement system are used for displaying flow field and temperature field information of fluid flow mixing in the branch-type channel; the laser generator is fixed on the ground and does not move along with the ocean condition simulation platform and is used for generating a sheet light source; the lens components are connected through a pipeline and fixed on the ground without moving along with the ocean condition simulation platform, the inlet of the lens component is parallel to the outlet of the laser generator, and the outlet of the lens component is perpendicular to the measurement area of the visual experiment section, so that the superposition of the lens light source emitted from the outlet of the lens component and the measurement area of the visual experiment section is ensured, and trace particles in the measurement area are illuminated; four CCD cameras are arranged in a cross shape, are symmetrically fixed on three-dimensional positioning tables on two sides of a visual experimental section in pairs, and synchronously shoot trace particle images in a branch-type channel under the ocean condition in real time to obtain the evolution characteristics of a flow field and a temperature field in the branch-type channel in time and space under the ocean condition.
The three-dimensional positioning rack is divided into two, and the three-dimensional positioning rack is arranged on two sides of the visual experimental section on the ocean simulation platform in parallel. Each three-dimensional positioning rack comprises a main servo motor, a main guide rail, two main sliding tables and two camera fixing tables. The length of the main guide rail is larger than that of the visual experimental section and smaller than that of the platform surface of the marine condition simulation platform, and the main guide rail is parallel to the visual experimental section; the main sliding table is rotationally connected with the main guide rail and fixedly connected with the camera fixing table, and is used for connecting the main guide rail and the camera fixing table in series. Each camera fixed station comprises three auxiliary servo motors, three auxiliary guide rails, three auxiliary sliding tables, an L-shaped plate and a disc. The auxiliary guide rails are mutually perpendicular in the three-dimensional direction, and the length of the auxiliary guide rails is smaller than that of the main guide rail; the three auxiliary sliding tables are respectively used for connecting the auxiliary guide rail with the auxiliary guide rail and the auxiliary guide rail with the L-shaped plate; the L-shaped plate is rotationally connected with the disc, and the CCD camera is fixedly arranged on the disc. The main servo motor drives the main guide rail to rotate so as to drive the main sliding table to synchronously move in the horizontal direction, and further drives the four CCD cameras to synchronously move in pairs, so that the position adjustment of the measuring area in the horizontal direction is realized; different auxiliary servo motors drive the auxiliary sliding tables to move in the three-dimensional direction by driving the corresponding auxiliary guide rails to rotate, so that the corresponding CCD cameras are driven to slide in the three-dimensional direction, the corresponding CCD cameras are driven to rotate in 360 degrees on the plane by rotating the disc, and the adjustment of the position and the size of the measuring area in the three-dimensional direction is further realized.
The liquid supply system comprises a main liquid storage tank, an auxiliary liquid storage tank, a circulating working medium, a liquid supply pump, a liquid supply pipeline, a valve and a pipeline connecting piece; the heating device and the internal circulating pump are arranged in the two liquid storage tanks, so that circulating working media from room temperature to 100 ℃ can be provided; working media with different temperatures are distributed in the main liquid storage tank and the auxiliary liquid storage tank so as to meet the requirements of thermal state experiments of mixing the working media with different temperatures; the circulating working medium is liquid with good light transmittance; the pump is provided with power for working medium circulation, and is a pump with stepless regulation; the valve is a regulating valve or a stop valve for controlling and regulating the flow direction and parameters of the circulating working medium; the pipeline connecting piece is used for connecting the liquid supply pipelines of all parts; the liquid feeding pump pumps out the circulating working medium from the liquid storage tank, and the circulating working medium is conveyed into the visual experiment section through the liquid feeding pipeline to be mixed and then flows back into the liquid storage tank, so that the circulation of the working medium can be realized; the use of different liquid tanks can be controlled by controlling the opening and closing of corresponding valves, so that the requirements of cold state experiments or hot state experiments are further met, the temperature of the circulating working media in the cold state experiments is the same, and the temperature difference exists between the circulating working media in the hot state experiments and is 0-75 ℃.
The temperature control system comprises a heating device, a cooling device and a control system; the heating device is arranged in the liquid storage tank and matched with the internal circulating pump to uniformly heat the circulating working medium, so that the stepless regulation of the circulating working medium from room temperature to 100 ℃ is realized; the cooling device is arranged on the visual experiment section through a liquid supply pipeline, a valve and a pipeline connecting piece, and the circulating working medium is cooled to the experiment temperature and then returned to the auxiliary liquid storage tank; the temperature control system is preferentially used when carrying out mixed thermal state experiments of working media with different temperatures, and the circulating working media are adjusted to the required experimental temperature through the action of the control system and the cooperation of the heating device and the cooling device.
The experimental parameter on-line monitoring system comprises monitoring equipment for temperature, pressure and flow parameters and a data acquisition device, and can monitor and acquire the experimental parameters on line in real time.
The invention also provides a visual experimental method for fluid flow mixing in the branch-type channel under the ocean condition, which comprises the following steps:
according to the experimental working conditions, related valves are opened and closed, so that liquid is supplied to different pipelines of the branch-type channel from the main liquid storage tank and/or the auxiliary liquid storage tank, and experimental equipment required by cold state experiments or hot state experiments is determined;
starting an experiment parameter on-line monitoring system to monitor temperature, pressure and flow parameters in an experiment device;
starting a liquid supply system, adding trace particles, fully circulating working media, discharging gas in a pipe, and adjusting the flow to experimental conditions;
starting a temperature control system, and adjusting the temperature of the working medium to an experimental working condition;
turning on the laser generator, adjusting the thickness of the sheet light source and the position of the lens assembly, so that the sheet light source illuminates the whole measuring area;
opening a CCD camera, adjusting parameters such as camera position, aperture, focal length and the like, and calibrating a measurement area;
starting an ocean condition simulation platform, setting motion parameters, and ensuring that a measurement area is always illuminated by laser in a motion range;
after stable operation, setting sampling parameters to sample the trace particle image of the measurement area;
and after shooting is finished, sequentially closing the optical measurement system, the temperature control system, the liquid supply system and the experimental parameter on-line monitoring system.
According to the method, cold state and hot state experiment switching can be realized by optimizing the arrangement of the valve and the related liquid supply pipeline; when the mixed cold state experiment of working media with the same temperature is carried out, the related valves are opened and closed, so that different pipelines of the branch type channel supply liquid from the auxiliary liquid storage tank, the mixed working media fully flow back to the auxiliary liquid storage tank, and the temperature control system and the other liquid storage tank do not participate in the cold state experiment process; when the mixed thermal state experiment of working media with different temperatures is carried out, the relevant valves are opened and closed, different pipelines of the branch type channel supply liquid from the main liquid storage tank and the auxiliary liquid storage tank respectively, part of the mixed working media flows back to the main liquid storage tank, and the other part of the mixed working media flows back to the auxiliary liquid storage tank after entering the cooling device for cooling, so that the experimental circulation process is completed.
Compared with the prior art, the invention has the following advantages:
the experimental device can simulate the ocean conditions, and develop experimental researches on the flow mixing characteristics of the fluid in the branch-type channel during six single-degree-of-freedom motions and the independent degree-of-freedom compound motions under the ocean conditions;
the CCD camera, which is a key component of the optical measurement system, realizes synchronous motion with the ocean condition simulation platform through the three-dimensional positioning rack, and can visually obtain the fluid flow mixing characteristic in the branch channel under the ocean condition in real time;
the four CCD cameras can realize sliding in the three-dimensional direction and 360-degree rotation on the plane of the disc through the three-dimensional positioning bench, are symmetrically distributed on two sides of the visual experimental section, and provide an experimental foundation for obtaining a three-dimensional flow field and a temperature field in a branch-shaped channel under ocean conditions;
the experimental device optimizes the pipeline arrangement and the temperature control in the liquid feeding system, can realize the rapid conversion of the fluid flow mixed thermal state experiment and the cold state experiment in the branch-type channel under the ocean condition, simplifies the experimental steps and improves the experimental safety.
Drawings
FIG. 1 is an overall block diagram of an embodiment of the present invention;
FIG. 2 is a schematic view of a three-dimensional positioning gantry;
FIG. 3 is an image of branched channel particles at different times in a cycle under marine conditions;
fig. 4 is a graph showing the flow field distribution of branch channels at different times in a period under marine conditions.
Detailed Description
The invention will now be described in detail with reference to the accompanying drawings and examples which are given to illustrate the invention but not to limit the scope thereof:
the experimental apparatus provided by the invention is described in detail below with reference to examples:
fig. 1 is a schematic diagram of a visual experimental device for fluid flow mixing in a branch channel under ocean conditions, which comprises a visual experimental section 1, an ocean condition simulation platform 2 for realizing ocean conditions, an optical measurement system consisting of trace particles, a laser generator 3, a CCD camera 4, a lens component 5 and a remote computer 6, a three-dimensional positioning rack 7, a liquid feeding system consisting of a main liquid storage tank 8, a secondary liquid storage tank 9, a variable frequency pump 10, a stop valve 11, a regulating valve 12 and related pipelines, a temperature control system consisting of an electric heating rod 13, a cooler 14 and a control system, and an experimental parameter on-line monitoring system consisting of a flowmeter 15, a pressure gauge 16, a thermometer 17 and a data collector 18. The liquid supply system is used for realizing the circulation of working media and is matched with the temperature control system and the experimental parameter on-line monitoring system to realize the required experimental working conditions; the key components of the optical measurement system are fixed on the ocean condition simulation platform in parallel with the visual experimental section through the three-dimensional positioning rack and synchronously move with the ocean condition simulation platform.
As a preferred embodiment of the present invention, the visualization experiment section 1 is a branch-shaped channel with an angle of 90 degrees, and the diameter ratio of the main pipe to the branch pipe is 3, and the visualization experiment section is made of an organic glass material. The two fluids flow in from the inlet of the different pipelines, are mixed in the branch-shaped channel and then flow out from the downstream outlet of the main pipe.
As a preferred embodiment of the invention, the ocean condition simulation platform 2 is a Stewart platform, and can realize six degrees of freedom motions of transverse movement, longitudinal movement, heave movement, roll movement, pitch movement and rotation and compound motions of each degree of freedom.
As a preferred embodiment of the invention, the tracer particles in the optical measurement system are fluorescent particles, so that the influence caused by wall refraction can be effectively reduced; the lens component 5 is a light guide arm and emits laser emitted by the laser generator 3 to the visual experiment section 1; four CCD cameras 4-1 to 4-4 (only two CCD cameras 4-1 and 4-2 on one three-dimensional positioning rack are marked in the schematic diagram 1) are placed on three-dimensional positioning racks 7 on two sides of the visual experiment section 1 and are used for shooting particle images of a measurement area and transmitting the particle images to a remote computer 6 for display, storage and post-processing.
As a preferred embodiment of the invention, the three-dimensional positioning rack 7 is arranged on two sides of the visual experiment section 1 in parallel. FIG. 2 is a schematic view of a single three-dimensional positioning gantry comprising a main servo motor 7-1, a main guide rail 7-2, a main sliding table 7-3, a sub servo motor 7-4, a sub guide rail 7-5, a sub sliding table 7-6, an L-shaped plate 7-7 and a disc 7-8. The main servo motor 7-1 drives the main sliding table 7-3 to synchronously move in the horizontal direction by driving the main guide rail 7-2 to rotate, so as to drive the CCD camera 4 to synchronously move, and the position adjustment of the measuring area in the horizontal direction is realized; the auxiliary servo motor 7-4 drives the auxiliary sliding table 7-6 to move in the three-dimensional direction by driving the auxiliary guide rail 7-5 to rotate, so that the CCD camera 4 is driven to slide in the three-dimensional direction. The L-shaped plate 7-7 is rotationally connected with the disc 7-8, and the CCD camera 4 is driven to rotate 360 degrees on a plane by rotating the disc 7-8, so that the position and the size of the measuring area in the three-dimensional direction are adjusted.
As the preferred implementation mode of the invention, the circulating working medium in the liquid supply system is water, and cold-state and hot-state experiment switching can be realized by optimizing the stop valve 11, the regulating valve 12 and related pipeline arrangement, so that the experiment flow is simplified, and the experiment safety is ensured. When a cold experiment is carried out, normal-temperature (25 ℃) normal-pressure fluid with the same temperature flows into inlets of different pipelines of the branch-type channels, in order to simplify the experimental flow, the stop valves 11-2 and 11-5 are opened, the stop valves 11-4 and 11-6 are closed, so that different pipelines of the branch-type channels supply liquid from the main liquid storage tank 8, meanwhile, the regulating valve 12-10 is closed, so that the mixed fluid completely flows into the main liquid storage tank 8 through the regulating valve 12-11, and the auxiliary liquid storage tank 9, the electric heating rod 13-2 and the cooler 14 do not participate in the cold experiment process; when a thermal experiment is carried out, fluid with different temperatures flows into inlets of different pipelines of the branch type channel, the temperature difference range is 0-75 ℃, at the moment, the stop valves 11-2 and 11-5 are closed, the stop valves 11-4 and 11-6 are opened, the main pipe and the branch pipe of the branch type channel are respectively supplied with liquid by the main liquid storage tank 8 and the auxiliary liquid storage tank 9, meanwhile, the regulating valves 12-10 and 12-11 are simultaneously opened, a part of mixed fluid flows into the main liquid storage tank 8 through the regulating valve 12-11, and a part of mixed fluid flows into the auxiliary liquid storage tank 9 after being cooled by the cooler 14 through the regulating valve 12-10, so that the experimental circulation process is completed.
As a preferred embodiment of the invention, the electric heating rods 13-1 and 13-2 in the temperature control system are respectively and uniformly arranged in the main liquid storage tank 8 and the auxiliary liquid storage tank 9, the temperatures in the main liquid storage tank and the auxiliary liquid storage tank are monitored through the thermometer 17-4 and 17-5, and temperature signals are transmitted to the control system to regulate and control the power of the electric heating rod 13 and the cooler 14 so as to realize the regulation and control of the fluid temperature.
As a preferred embodiment of the invention, the experimental parameter on-line monitoring system mainly comprises a flowmeter 15, a pressure gauge 16, a thermometer 17 and a data collector 18. The flowmeter 15, the pressure gauge 16 and the thermometer 17 convert the physical parameters into electrical signals and transmit the electrical signals to the data collector 18 for monitoring, displaying and storing the experimental parameters so as to ensure that each experimental parameter meets the working condition required by the experiment.
The experimental method provided by the invention is described in detail below with reference to examples:
the specific method for the fluid flow mixing visualization experiment in the branch-type channel under the ocean condition provided by the invention comprises the following steps:
before the experiment, the relevant valves in the experimental device can be adjusted according to the required experimental working conditions so as to realize the conversion of cold state and hot state experiments. In this example, the temperatures of the fluids in the branched channels were the same, and all were water at normal temperature (25 ℃) and normal pressure. Therefore, the stop valves 11-2, 11-5 are opened before the experiment, the stop valves 11-4, 11-6 are closed, so that branch-type channels are supplied with liquid from the main liquid storage tank 8 through different pipelines, and meanwhile, the regulating valve 12-10 is closed, so that the mixed liquid flows into the main liquid storage tank 8 through the regulating valve 12-11.
And opening the regulating valves 12-2 and 12-6, opening the stop valve 11-3, closing the regulating valves 12-1 and 12-5, opening the variable frequency pumps 10-1 and 10-2 to run for a period of time, and checking whether the variable frequency pumps 10-1 and 10-2 run normally or not and whether a pipeline leaks or not. A proper amount of trace particles are added into the main liquid storage tank 8 and stirred uniformly.
And then opening branch-type channel inlet regulating valves 12-1 and 12-5, slowly closing regulating valves 12-2 and 12-6, allowing fluid to enter the visualization experiment section 1, opening exhaust valve discharge pipes on pressure gauges 16-1 and 16-2 after the fluid is full of the pipeline, and checking whether the pipeline has leakage.
The data collector 18 is started to monitor parameters of the flowmeter 15, the pressure gauge 16 and the thermometer 17, the variable frequency pumps 10-1 and 10-2 are adjusted to enable all experimental parameters to meet required experimental working conditions, and experimental working media are fully circulated to enable all experimental parameters to reach a stable state.
Starting a laser generator 3 in the optical measurement system, adjusting a lens component 5, adjusting an optical path to a measurement area in the visual experiment section 1, starting a CCD camera 4, moving a three-dimensional positioning rack 7, and performing optical calibration to enable a camera shooting area to coincide with the measurement area.
After the calibration is completed, the ocean condition simulation platform 2 is started, and is set to be theta=theta max * sin (2pi/T x T), wherein θ is the rocking angle, θ max For the maximum rocking angle, T is the rocking period. After entering a stable running state, the CCD camera 4 is used for shooting and sampling the instant time t=0 and t=T/2 primary particle images of the measuring area in the moving process, and the instant time t=0 and t=T/2 primary particle images are stored in the computer 6. Fig. 3 shows the photographed primary particle images of different moments t=0 and t=t/2 in the period under marine conditions.
After sampling is completed, the laser generator 3, the CCD camera 4 and the data collector 18 are sequentially closed, the marine condition simulation platform 2 is stopped, the variable frequency pumps 10-1 and 10-2 and related valves are closed, and the experiment is finished.
The flow field distribution of the original particle image obtained by processing the original particle image at different moments t=0 and t=t/2 is shown in fig. 4. The embodiment shows that the invention can realize the visual research of the fluid flow mixing characteristic in the branch-type channel under the ocean condition.
Claims (8)
1. The utility model provides a branch type in-channel fluid flow mixes visual experimental apparatus under ocean condition which characterized in that experimental apparatus includes: the system comprises an ocean condition simulation platform, a visual experiment section, an optical measurement system, a three-dimensional positioning rack, a liquid supply system, a temperature control system and an experiment parameter on-line monitoring system; the optical measurement system comprises a laser generator, a CCD camera, a lens component and a remote computer; the liquid supply system is used for realizing the circulation of working media and is matched with the temperature control system and the experimental parameter on-line monitoring system to realize the required experimental working conditions; the CCD camera of the optical measurement system is fixed on the ocean condition simulation platform in parallel with the visual experimental section through the three-dimensional positioning rack and moves synchronously with the ocean condition simulation platform;
the visual experiment section comprises at least one branch structure formed by connecting two pipelines, is arranged above a through area of the ocean simulation platform through a pipeline fixing frame, is parallel to the center line of the ocean simulation platform and is parallel to the three-dimensional positioning rack; the section of the pipeline is rectangular, circular or elliptical, and the pipeline is made of light-transmitting and plastic materials;
the tracer particles of the optical measurement system are used for displaying the flow field and temperature field information of fluid flow mixing in the branch-type channel; the laser generator is fixed on the ground and does not move along with the ocean condition simulation platform and is used for generating a sheet light source; the lens components are connected through a pipeline and fixed on the ground without moving along with the ocean condition simulation platform, the inlet of the lens component is parallel to the outlet of the laser generator, and the outlet of the lens component is perpendicular to the measurement area of the visual experiment section, so that the superposition of the lens light source emitted from the outlet of the lens component and the measurement area of the visual experiment section is ensured, and trace particles in the measurement area are illuminated; four CCD cameras are arranged in a cross shape, are symmetrically fixed on three-dimensional positioning tables at two sides of a visual experimental section in pairs, and synchronously shoot trace particle images in a branch-type channel under the ocean condition in real time to obtain the evolution characteristics of a flow field and a temperature field in the branch-type channel in time and space under the ocean condition;
the three-dimensional positioning rack is divided into two pieces, and the two pieces are arranged on two sides of the visual experimental section on the ocean simulation platform in parallel; each three-dimensional positioning rack comprises a main servo motor, a main guide rail, two main sliding tables and two camera fixing tables; the length of the main guide rail is larger than that of the visual experimental section and smaller than that of the platform surface of the marine condition simulation platform, and the main guide rail is parallel to the visual experimental section; the main sliding table is rotationally connected with the main guide rail and fixedly connected with the camera fixing table, and is used for connecting the main guide rail and the camera fixing table in series.
2. The visual experimental device for fluid flow mixing in a branch channel under ocean conditions as claimed in claim 1, wherein the ocean condition simulation platform consists of a platform table top, a servo control system and a driving shaft; reserving a square through area on the platform surface so as to facilitate the laser to illuminate the visual experimental section, wherein the size of the through area is larger than that of the visual experimental section; the driving shaft is rotationally connected with the platform surface, and the servo control system can control the driving shaft to move so as to drive the platform surface to move and rotate in the three-dimensional direction, so that the simulation of ocean conditions is realized; the ocean condition simulation platform can realize six-degree-of-freedom independent movement and independent degree-of-freedom compound movement and can be in a long-time static state at a specified angle.
3. The device for visualizing a mixture of fluid flows in a branched channel under marine conditions as in claim 1, wherein each camera mount comprises three secondary servomotors, three secondary rails, three secondary slipways, an L-shaped plate and a disk; the auxiliary guide rails are mutually perpendicular in the three-dimensional direction, and the length of the auxiliary guide rails is smaller than that of the main guide rail; the three auxiliary sliding tables are respectively used for connecting the auxiliary guide rail with the auxiliary guide rail and the auxiliary guide rail with the L-shaped plate; the L-shaped plate is rotationally connected with the disc, and the CCD camera is fixedly arranged on the disc; the main servo motor drives the main guide rail to rotate so as to drive the main sliding table to synchronously move in the horizontal direction, and further drives the four CCD cameras to synchronously move in pairs, so that the position adjustment of the measuring area in the horizontal direction is realized; different auxiliary servo motors drive the auxiliary sliding tables to move in the three-dimensional direction by driving the corresponding auxiliary guide rails to rotate, so that the corresponding CCD cameras are driven to slide in the three-dimensional direction, the corresponding CCD cameras are driven to rotate in 360 degrees on the plane by rotating the disc, and the adjustment of the position and the size of the measuring area in the three-dimensional direction is further realized.
4. The visualized experimental device for fluid flow mixing in a branch channel under ocean conditions as claimed in claim 1, wherein the liquid supply system comprises a main liquid storage tank, a secondary liquid storage tank, a circulating working medium, a liquid supply pump, a liquid supply pipeline, a valve and a pipeline connecting piece; the main liquid storage tank and the auxiliary liquid storage tank are internally provided with a heating device and an internal circulating pump, and can provide circulating working media from room temperature to 100 ℃; working media with different temperatures are distributed in the main liquid storage tank and the auxiliary liquid storage tank; the circulating working medium is liquid with good light transmittance; the pump is provided with power for working medium circulation, and is a pump with stepless regulation; the valve is a regulating valve or a stop valve for controlling and regulating the flow direction and parameters of the circulating working medium; the pipeline connecting piece is used for connecting the liquid supply pipelines of all parts; the liquid feeding pump pumps out the circulating working medium from the liquid storage tank, and the circulating working medium is conveyed into the visual experiment section through the liquid feeding pipeline to be mixed and then flows back into the liquid storage tank, so that the circulation of the working medium can be realized; the use of the main liquid storage tank and the auxiliary liquid storage tank can be controlled by controlling the opening and closing of the corresponding valves; the temperature of the circulating working medium in the cold state experiment is the same, and the temperature difference exists in the circulating working medium in the hot state experiment, wherein the temperature difference is 0-75 ℃.
5. The visual experimental device for fluid flow mixing in a branch channel under ocean conditions as claimed in claim 1, wherein the temperature control system comprises a heating device, a cooling device and a control system; the heating device is arranged in the liquid storage tank and matched with the internal circulating pump to uniformly heat the circulating working medium, so that the stepless regulation of the circulating working medium from room temperature to 100 ℃ is realized; the cooling device is arranged on the visual experiment section through a liquid supply pipeline, a valve and a pipeline connecting piece, and is used for cooling the circulating working medium to the experiment temperature and returning the circulating working medium to the auxiliary liquid storage tank; the temperature control system is preferentially used when carrying out mixed thermal state experiments of working media with different temperatures, and the circulating working media are adjusted to the required experimental temperature through the action of the control system and the cooperation of the heating device and the cooling device.
6. The device for visualizing mixed fluid flow in a branch-type channel under marine conditions as in claim 1, wherein said on-line monitoring system for experimental parameters comprises a monitoring device for temperature, pressure and flow parameters and a data collector, and can monitor and collect experimental parameters on line in real time.
7. A method for visualizing fluid flow mixing in a branch-shaped channel under ocean conditions, which uses the device for visualizing fluid flow mixing in a branch-shaped channel under ocean conditions according to any one of claims 1-6, and comprises the following specific steps:
according to the experimental working conditions, related valves are opened and closed, so that liquid is supplied to different pipelines of the branch-type channel from the main liquid storage tank and/or the auxiliary liquid storage tank, and experimental equipment required by cold state experiments or hot state experiments is determined;
starting an experiment parameter on-line monitoring system to monitor temperature, pressure and flow parameters in an experiment device;
starting a liquid supply system, adding trace particles, fully circulating working media, discharging gas in a pipe, and adjusting the flow to experimental conditions;
starting a temperature control system, and adjusting the temperature of the working medium to an experimental working condition;
turning on the laser generator, adjusting the thickness of the sheet light source and the position of the lens assembly, so that the sheet light source illuminates the whole measuring area;
opening a CCD camera, adjusting camera position, aperture and focal length parameters, and calibrating a measurement area;
starting an ocean condition simulation platform, setting motion parameters, and ensuring that a measurement area is always illuminated by laser in a motion range;
after the operation is stable, sampling parameters are set to sample and process trace particle images of a measurement area;
and after shooting is finished, sequentially closing the optical measurement system, the temperature control system, the liquid supply system and the experimental parameter on-line monitoring system.
8. The method for visualizing a mixture of fluid flows in a branch-shaped channel under marine conditions as in claim 7, wherein said method is used for achieving a cold-state and hot-state experimental switch by optimizing the valve and associated feed-line arrangement; when the mixed cold state experiment of working media with the same temperature is carried out, the related valves are opened and closed, so that different pipelines of the branch type channel supply liquid from the auxiliary liquid storage tank, the mixed working media fully flow back to the auxiliary liquid storage tank, and the temperature control system and the other liquid storage tank do not participate in the cold state experiment process; when the mixed thermal state experiment of working media with different temperatures is carried out, the relevant valves are opened and closed, different pipelines of the branch type channel supply liquid from the main liquid storage tank and the auxiliary liquid storage tank respectively, part of the mixed working media flows back to the main liquid storage tank, and the other part of the mixed working media flows back to the auxiliary liquid storage tank after entering the cooling device for cooling, so that the experimental circulation process is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210497664.8A CN114894435B (en) | 2022-05-09 | 2022-05-09 | Device and method for visualizing fluid in branch-type channel under ocean condition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210497664.8A CN114894435B (en) | 2022-05-09 | 2022-05-09 | Device and method for visualizing fluid in branch-type channel under ocean condition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114894435A CN114894435A (en) | 2022-08-12 |
| CN114894435B true CN114894435B (en) | 2023-04-21 |
Family
ID=82721238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210497664.8A Active CN114894435B (en) | 2022-05-09 | 2022-05-09 | Device and method for visualizing fluid in branch-type channel under ocean condition |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114894435B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107764701B (en) * | 2017-10-19 | 2019-08-13 | 中南大学 | It is a kind of analysis shear stress flow field particle with fluidity experimental provision and experimental method |
| JP7065060B2 (en) * | 2018-08-20 | 2022-05-11 | Ｊｆｅテクノリサーチ株式会社 | Fluid flow measuring device and gas detecting device |
| CN109696295B (en) * | 2019-02-20 | 2020-02-18 | 西安交通大学 | Device and method for researching dynamic characteristics of bubbles under six-degree-of-freedom motion condition |
| CN112881386B (en) * | 2021-01-11 | 2022-04-05 | 西安交通大学 | Narrow slit channel visualization experiment device and method under six-degree-of-freedom motion condition |
| CN113804398A (en) * | 2021-08-23 | 2021-12-17 | 西北工业大学 | Cluster large-scale three-dimensional flow field and hydrodynamic force synchronous measurement system and test method |
-
2022
- 2022-05-09 CN CN202210497664.8A patent/CN114894435B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN114894435A (en) | 2022-08-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109473187B (en) | LAYER FLUID stirs and make muddy process and heat-transfer character experimental system visualizing and method under ocean condition | |
| CN103983464B (en) | Heat exchanger performance test platform | |
| CN107941624B (en) | High-temperature high-frequency material mechanical property in-situ testing device | |
| CN112881386B (en) | Narrow slit channel visualization experiment device and method under six-degree-of-freedom motion condition | |
| CN104132796B (en) | A kind of stator impeller interior flow field particle image velocimetry assay device | |
| CN105842080A (en) | Mechanical testing system for material with composite load in induction heating mode | |
| US20220130562A1 (en) | Multi-loop natural circulation experimental device under six-degree-of-freedom motion conditions and method therefor | |
| CN109374308B (en) | Aeroengine combustion chamber simulation test bed with steady-state temperature field | |
| CN112885491B (en) | Loop cycle characteristic experiment system and method under six-degree-of-freedom motion condition | |
| CN113155503A (en) | Supercritical carbon dioxide heat exchange performance test platform for printed circuit board type heat exchanger | |
| CN105387999A (en) | Method for testing optical efficiency of slot type solar thermal collector | |
| CN114894435B (en) | Device and method for visualizing fluid in branch-type channel under ocean condition | |
| CN110243859A (en) | A kind of rotation heat transfer experiment system and method for the test of turbine blade cooling performance | |
| CN107064173A (en) | The detection means and detection method of large-scale planar optical elements beauty defects | |
| CN108982056B (en) | A kind of marine environment simulation test device and test method | |
| CN114999682B (en) | Passive residual heat hydraulic test device and method for polar environment nuclear power device | |
| CN115388933A (en) | Underwater variable-pressure additive repair test device under wide-temperature-range unsteady-state simulation environment of ocean | |
| CN111210920A (en) | Test device for simulating natural circulation loop of fluid of marine nuclear reactor | |
| Nie et al. | An online data-driven approach for performance prediction of electro-hydrostatic actuator with thermal-hydraulic modeling | |
| CN110454466A (en) | Hydrostatic drive system combination property bench and method | |
| CN203824778U (en) | A heat exchanger performance test platform | |
| CN103940579B (en) | A kind of experiment and image automated collection systems for swaying condition bubble behavioral study | |
| CN109991277B (en) | Turbulent premixed gas pipeline explosion experiment testing device and method | |
| CN109100164A (en) | thermal simulation system and heating component testing method | |
| CN106338222B (en) | A kind of optical target dynamic simulation system with spheric motion track |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |