CN212318186U - Nano fluid fuel real-time ultrasonic atomization system of shock tube test platform - Google Patents
Nano fluid fuel real-time ultrasonic atomization system of shock tube test platform Download PDFInfo
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- CN212318186U CN212318186U CN202020726777.7U CN202020726777U CN212318186U CN 212318186 U CN212318186 U CN 212318186U CN 202020726777 U CN202020726777 U CN 202020726777U CN 212318186 U CN212318186 U CN 212318186U
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Abstract
The utility model relates to a burning experiment technique aims at providing a real-time ultrasonic atomization system of nanometer fluid fuel based on shock tube test platform. The system comprises a shock tube, wherein a blind flange with an axial through hole is arranged at the tail end of a low-pressure section; the ultrasonic atomizing head is provided with a conical nozzle part and a cylindrical tail section, and the nozzle part is butted with the through hole; the end face of the tail end of the ultrasonic atomizing head is provided with a high-frequency line plug and a liquid inlet, the high-frequency line plug is connected to a driving power supply through a cable, and the liquid inlet is positioned at the tail end of the atomizing channel and is connected to a liquid feeding pump through a liquid conveying pipe. The utility model can save the atomization energy consumption and ensure that suspended nano fluid fuel atomized liquid drops exist all the time; the fuel sample introduction and the speed control can be finished by adopting a common liquid feeding pump, and the device has a simple structure and strong universality. The device can be suitable for shock tube ignition experiments with different sizes and different requirements, and has strong universality. The device can be suitable for most working conditions in a shock tube ignition combustion experiment, and is reliable, efficient and good in repeatability.
Description
Technical Field
The patent of the utility model relates to a burning experiment technical field aims at providing a shock tube test platform's real-time ultrasonic atomization system of nanometer fluid fuel.
Background
The nano fluid fuel consists of solid nano metal (aluminum, boron and the like) and liquid hydrocarbon fuel, has the advantages of high energy density, low ignition temperature, high combustion efficiency and the like, is a potential substitute of liquid engine fuel, and is widely concerned by researchers at home and abroad. The research on the ignition combustion characteristics of the nanofluid fuel is related to the energy release and combustion dynamics characteristics of the fuel, and is one of hot spots in the field of aeronautical engineering. The ignition delay time is an important representation of the combustion characteristics of the nanofluid fuel and is also an important basis for verifying a chemical kinetic model of a combustion reaction and simplifying the model. In the field of aeronautical engineering application, the ignition delay of fuel is an important parameter and basis for aeroengine design, and has an important influence on the combustion performance and the combustion stability of an aeroengine combustion chamber. Therefore, accurate testing of the ignition time of the fuel is an important prerequisite for developing fuel combustion research and is also an important condition for theoretical research of combustion dynamics. The fuel combustion is generally divided into three stages of ignition, flame propagation and stable combustion, and the nanoparticles in the nano fluid fuel can shorten the ignition delay of the fuel, so that the ignition delay time of the nano fluid fuel is shorter than that of hydrocarbon liquid fuel, but the difficulty in measuring the ignition delay time of the fuel is increased due to the existence of solid-liquid two-phase substances in the fuel.
The shock tube is one of the main devices for measuring the ignition delay characteristic of the fuel in the laboratory at present, and the pressure difference between the high-pressure section and the low-pressure section breaks the membrane to generate an incident shock wave and a reflected shock wave to carry out uniform heat insulation non-isentropic heating on the fuel, so that the purpose of heating and igniting the fuel is achieved. Because the measuring parameter range of the shock tube is wider, the ignition combustion characteristic parameter in the required measuring range can be obtained by changing the pressure difference between the high-pressure section and the low-pressure section, and therefore, the shock tube is widely used for experimental research on fuel ignition characteristics in the fields of aerodynamics, chemical reaction kinetics, combustion science, aeroacoustics and the like.
For hydrocarbon liquid fuel, the liquid is sent into the shock tube in a gasification or atomization mode generally for ignition and combustion experiments. However, for the nanofluid fuel, the liquid-phase hydrocarbon fuel and the solid-phase nanoparticles are directly separated through gasification, so that the characteristics of the nanofluid are fundamentally changed, and the nanofluid fuel is obviously not suitable. Therefore, the reasonable atomization mode is the premise for realizing the ignition combustion experiment of the nano fluid fuel in the shock tube. The existing technology adopts the differential pressure type atomization mode mostly, and fuel atomization gets into the shock tube before starting ignition operation earlier, but the fog torch after the atomizing in case gets into the shock tube, contains a large amount of solid phase nanometer particles in the atomizing liquid drop, and the most density of this kind of solid phase particle is great, can subside fast because of the action of gravity, makes nanometer fluid fuel liquid-solid separation, can direct influence ignition combustion characteristic experiment test result. Because the pressure in the shock tube needs to be ensured to be stable during ignition, the pressure can not be continuously atomized and sprayed in real time during an ignition experiment (the pressure can be influenced by differential pressure fluctuation). Therefore, how to ensure that the shock tube test section has stable suspension and atomized liquid drops with uniform particle size distribution and determine the suspension amount of the liquid drops entering the shock tube are the key problems of the ignition characteristic measurement of the nano fluid fuel shock tube.
The problems of the current atomization mode are as follows: (1) differential pressure atomization is not only complicated in structure, but also difficult to achieve real-time atomization, and has more errors when used as a shock tube ignition experiment. (2) The premixing method adopts a premixing tank to premix atomized liquid drops and air in advance, but the nano fluid fuel is solid-liquid two-phase flow fuel, cannot form stable aerosol like single-phase hydrocarbon fuel, and if the nano fluid fuel is fed before ignition operation, the solid can be rapidly settled due to the gravity effect. (3) Other high-efficiency atomization methods, such as electrostatic atomization, can be fed in real time, and have little effect on pressure, but the methods consume much energy.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is, overcome not enough among the prior art, provide a shock tube test platform's real-time ultrasonic atomization system of nanometer fluid fuel.
For solving the technical problem, the utility model discloses a solution is:
the nanometer fluid fuel real-time ultrasonic atomization system of the shock tube test platform comprises a shock tube consisting of a high-pressure section, a low-pressure section and a diaphragm; a blind flange is arranged at the tail end of the low-pressure section, and an axial through hole for mounting an ultrasonic atomizing head and communicating the inner cavity of the low-pressure section is formed in the blind flange; the ultrasonic atomizing head is provided with a conical nozzle part and a cylindrical tail section, a penetrating atomizing channel is arranged on a symmetrical central axis of the ultrasonic atomizing head, and the radial size of the atomizing channel has a changing trend of gradually shrinking from the tail section to the nozzle part; the ultrasonic atomizing head is fixedly arranged on the blind flange and is butted with the through hole by the nozzle part of the ultrasonic atomizing head; the end face of the tail end of the ultrasonic atomizing head is provided with a high-frequency line plug and a liquid inlet, the high-frequency line plug is connected to a driving power supply through a cable, and the liquid inlet is positioned at the tail end of the atomizing channel and is connected to a liquid feeding pump through a liquid conveying pipe.
The utility model discloses in, ultrasonic atomization head is the integral type structure.
The utility model discloses in, the inlet that is located atomizing channel end is outstanding in the tubular structure on blind flange surface, ultrasonic atomization head is with its nozzle part butt joint in tubular structure.
In the utility model, the symmetrical axle wire of the ultrasonic atomization head is arranged in parallel with the axle wire of the shock tube, and the ultrasonic atomization head is positioned above the axle wire of the shock tube; and if the distance between the two central axes is h and the radius of the radial section of the shock tube is R, R/4 is more than h and less than R/2.
In the utility model, a radially contracted connecting part is arranged between the nozzle part and the tail section of the ultrasonic atomizing head; the clamp is arranged on the blind flange, and the ultrasonic atomization head is fixedly arranged at the liquid inlet in a mode that the clamp is embedded into and clamps the connecting part.
The utility model discloses in, the cable of connecting high frequency line plug and drive power supply is coaxial cable.
The utility model discloses in, set up the sealing rubber circle between the nozzle position of inlet and ultrasonic atomization head.
In the utility model, a valve is arranged on the infusion tube (the stability of liquid feeding is improved).
The utility model discloses in, the blind flange passes through the bolt fastening on the terminal flange of low pressure section, is equipped with the packing ring between the two (ensures sealed effect).
The utility model discloses in, be equipped with the packing ring of a plurality of between blind flange and low pressure section end flange face to make the blind flange tangent (reduce the nozzle to the interference in intraductal flow field) with the terminal flange face place plane of low pressure section.
Compared with the prior art, the utility model has the technical effects that:
(1) the ultrasonic atomization technology is applied to atomization of the nano fluid fuel in the shock tube, and atomization energy consumption is saved.
(2) The method has the advantages that the mode of real-time continuous liquid feeding and ultrasonic atomization is utilized, suspended nano fluid fuel atomized liquid drops exist in the shock tube test section all the time, meanwhile, due to the fact that ultrasonic atomization is utilized, the pressure of the low-pressure section of the shock tube cannot change along with the shock tube test section in the continuous feeding process of the fog torch, real-time synchronization with ignition operation can be kept, and test accuracy is guaranteed.
(3) Because the low-pressure section of the shock tube is generally negative pressure, the fuel sample introduction and the rate control can be finished by adopting a common liquid feeding pump, the structure is simple, and the universality is strong.
(4) The actual suspension amount of the nano fluid fuel atomized droplets at the test section in the pipe can be determined by measuring the sedimentation rate of the atomized droplets in advance and controlling the sample feeding rate and the sample feeding time by a valve on the liquid conveying pipe.
(5) The shock tube ignition test device can be suitable for shock tubes with different sizes and different requirements by changing the size of the blind flange and the opening of the shock tube, and has strong universality.
(6) The device can be well suitable for most working conditions in a shock tube ignition combustion experiment, and is reliable, efficient and good in repeatability.
Drawings
FIG. 1 is a front view of a blind flange;
FIG. 2 is a side cross-sectional view of the blind flange of FIG. 1;
FIG. 3 is a cross-sectional view of an ultrasonic atomizing head;
fig. 4 is a schematic diagram of the nano fluid fuel real-time ultrasonic atomization system.
Reference numerals in the drawings: the device comprises a liquid inlet 1, a high-frequency wire plug 2, a shock tube 3, a gasket 4, an ultrasonic atomizing head 5, a blind flange 6, a hoop 7, a driving power supply 8, a liquid feeding pump 9 and a valve 10.
Detailed Description
The technical solution of the present invention will be described in detail with reference to the accompanying drawings.
The utility model discloses real-time ultrasonic atomization system of well shock tube test platform's nanometer fluid fuel, include shock tube 3 of constituteing by high-pressure section, low pressure section and diaphragm. The end of the low-pressure section of the shock wave tube 3 is provided with a blind flange 6, the blind flange 6 is provided with a through hole, one end of the blind flange is communicated with the inner cavity of the low-pressure section, and the other end of the blind flange is connected with the liquid inlet 1.
The ultrasonic atomizing head 5 has a conical nozzle portion and a cylindrical tail section, and a radially constricted connecting portion is provided in the middle. The ultrasonic atomizing head 5 is provided with a through axial atomizing channel on a symmetrical central axis, and the radial size of the through axial atomizing channel has a gradually shrinking trend from the tail section to the nozzle part. The end face of the tail end of the ultrasonic atomizing head 5 is provided with a high-frequency line plug 2 and a liquid inlet 1, the high-frequency line plug 2 is connected to a driving power supply 8 through a coaxial cable, the liquid inlet 1 is positioned at the tail end of an atomizing channel and is connected to a liquid feeding pump 9 through a liquid conveying pipe, and the liquid conveying pipe is provided with a valve 10. A hoop 7 (made of stainless steel can be selected) is arranged on the blind flange 6, and the ultrasonic atomizing head 5 is fixedly installed by the hoop 7 in a mode of embedding and clamping the connecting part; at this time, the nozzle part is butted with the liquid inlet 1. The liquid inlet 1 is a tubular structure protruding out of the surface of the blind flange 6, the shape of the orifice of the tubular structure is matched with the conical shape of the nozzle part of the ultrasonic atomizing head 5, and a sealing rubber ring is arranged between the orifice and the conical shape to reduce abrasion and increase air tightness. The symmetrical central axis of the ultrasonic atomizing head 5 is arranged in parallel with the central axis of the shock tube 3 and is positioned above the central axis of the shock tube 3. And if the distance between the two central axes is h and the section radius of the shock tube 3 is R, R/4 is more than h and less than R/2. Such a design may ensure a longer suspension time of the atomized fuel droplets.
During processing, the ultrasonic atomizing head 5 preferably has an integral structure, i.e., the conical nozzle portion and the cylindrical tail section are integral, as shown in fig. 3. Because the ultrasonic atomization device adopted in the shock tube experiment has small volume, the whole ultrasonic atomization head 5 directly has the functions of transduction and atomization, and does not need to be separately designed, manufactured and assembled according to the ultrasonic atomization device used in industry (with larger volume). Under the condition of the size, the size range of atomized liquid drops of the nano fluid fuel can be controlled to be 50-100 mu m by controlling the power of the driving power supply 8.
During installation, the blind flange is fixed on the flange at the tail end of the low-pressure section through bolts, a gasket 4 is arranged between the blind flange and the flange to increase air tightness and reduce abrasion, and the gasket 4 can be made of graphite or polytetrafluoroethylene. By arranging the gaskets 4 with proper quantity, the top end of the nozzle part of the ultrasonic atomizing head 5 is tangent to the plane of the flange surface at the tail end of the low-pressure section so as to reduce the influence on the flow field in the pipe. The driving power supply 8 is used for converting the alternating current of 50Hz into a high-frequency power supply and supplying the high-frequency power supply to the ultrasonic atomizing head 5 to realize fuel atomization; the liquid feeding pump 9 is connected with the ultrasonic atomizing head 5 through a liquid conveying pipe with a valve 10, and can control the liquid feeding amount and the speed.
Before use, the liquid feeding rate of the liquid feeding pump 9 is set, the liquid feeding pump 9 is opened, the valve 10 on the liquid conveying pipe is opened, and the liquid feeding pump 9 and the valve 10 are closed simultaneously when the liquid conveying pipe is filled with fuel to be detected; after the low-voltage section of the shock tube 3 is exhausted, the driving power supply 8 is turned on and the proper power is adjusted, and then the liquid feeding pump 9 is started and the valve 10 is opened to control the introduction of the atomized fuel. And recording the settling time of the atomized liquid drops by means of an observation window of the low-pressure section of the shock tube 3, and calibrating the liquid drop settling rate at different liquid feeding rates.
During testing, the liquid feeding rate of the liquid feeding pump 9 is set, the liquid feeding pump 9 is opened, the valve 10 on the liquid conveying pipe is opened, and the liquid feeding pump 9 and the valve 10 are closed simultaneously when the liquid conveying pipe is filled with fuel to be tested; after the high-voltage section and the low-voltage section of the shock tube 3 are adjusted to be set working conditions, the driving power supply 8 is turned on and adjusted to be specified power; and then starting the liquid feeding pump 9 and opening the valve 10, enabling the fuel to continuously enter the shock tube 3 in real time after ultrasonic atomization, and controlling the shock tube 3 to rupture the membrane to finish a test of an ignition characteristic test.
The utility model provides a drive power supply 8 and feed pump 9 all have the conventional commercial product of multiple model to supply for use. Through repeated verification many times, the utility model discloses an ultrasonic atomization head 5 can convert high-frequency electric energy to mechanical vibration energy, and atomization effect is stable and energy-conserving, and the homoenergetic is igniteed under various experimental operating modes success rate height, effect ideal.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made herein without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims (10)
1. A nanometer fluid fuel real-time ultrasonic atomization system of a shock tube test platform comprises a shock tube consisting of a high-pressure section, a low-pressure section and a diaphragm; the ultrasonic atomization device is characterized in that a blind flange is arranged at the tail end of the low-pressure section, and an axial through hole for mounting an ultrasonic atomization head and communicating an inner cavity of the low-pressure section is formed in the blind flange; the ultrasonic atomizing head is provided with a conical nozzle part and a cylindrical tail section, a penetrating atomizing channel is arranged on a symmetrical central axis of the ultrasonic atomizing head, and the radial size of the atomizing channel has a changing trend of gradually shrinking from the tail section to the nozzle part; the ultrasonic atomizing head is fixedly arranged on the blind flange and is butted with the through hole by the nozzle part of the ultrasonic atomizing head; the end face of the tail end of the ultrasonic atomization head is provided with a high-frequency line plug and a liquid inlet, the high-frequency line plug is connected to a driving power supply through a cable, and the liquid inlet is positioned at the tail end of the atomization channel and is connected to a liquid feeding pump through a liquid conveying pipe.
2. The real-time ultrasonic atomization system of claim 1 in which the ultrasonic atomization head is a unitary structure.
3. The real-time ultrasonic atomization system of the nanofluid fuel according to claim 1, wherein the liquid inlet at the tail end of the atomization channel is a tubular structure protruding from the surface of the blind flange, and the ultrasonic atomization head is butted in the tubular structure by a nozzle part of the ultrasonic atomization head.
4. The real-time ultrasonic atomization system of the nanofluid fuel according to claim 1, wherein a symmetrical central axis of the ultrasonic atomization head is arranged in parallel with a central axis of the shock tube, and the ultrasonic atomization head is located above the central axis of the shock tube; and if the distance between the two central axes is h and the radius of the radial section of the shock tube is R, R/4 is more than h and less than R/2.
5. The real-time ultrasonic atomization system of the nanofluid fuel according to claim 1, wherein a radially-contracted connecting portion is arranged between a nozzle portion and a tail section of the ultrasonic atomization head; the clamp is arranged on the blind flange, and the ultrasonic atomization head is fixedly arranged at the liquid inlet in a mode that the clamp is embedded into and clamps the connecting part.
6. The real-time ultrasonic atomization system of claim 1, wherein the cable connecting the high-frequency wire plug and the driving power source is a coaxial cable.
7. The real-time ultrasonic atomization system of the nanofluid fuel according to claim 1, wherein a sealing rubber ring is arranged between the liquid inlet and a nozzle portion of the ultrasonic atomization head.
8. The real-time ultrasonic atomization system of claim 1 in which a valve is disposed on the fluid line.
9. The real-time ultrasonic atomization system of the nanofluid fuel according to any one of claims 1 to 8, wherein the blind flange is fixed to a flange at the end of the low pressure section by bolts with a gasket interposed therebetween.
10. The real-time ultrasonic atomization system of claim 9, wherein a plurality of gaskets are disposed between the blind flange and the flange surface at the end of the low-pressure section, and the top end of the nozzle portion of the ultrasonic atomization head is tangent to the plane where the flange surface at the end of the low-pressure section is located.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020726777.7U CN212318186U (en) | 2020-05-05 | 2020-05-05 | Nano fluid fuel real-time ultrasonic atomization system of shock tube test platform |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020726777.7U CN212318186U (en) | 2020-05-05 | 2020-05-05 | Nano fluid fuel real-time ultrasonic atomization system of shock tube test platform |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114264447A (en) * | 2021-12-31 | 2022-04-01 | 西安交通大学 | Injection type shock tube and method |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114264447A (en) * | 2021-12-31 | 2022-04-01 | 西安交通大学 | Injection type shock tube and method |
| CN114264447B (en) * | 2021-12-31 | 2023-05-05 | 西安交通大学 | Injection shock tube and method |
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