CN110161175A - A kind of titanium burn experimental rig and its test method - Google Patents
A kind of titanium burn experimental rig and its test method Download PDFInfo
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Abstract
The invention belongs to aero-engine technology field, it is related to a kind of titanium burn experimental rig and its test method.The experimental rig includes combustion chamber, optical fiber laser, air supply pipe, exhaust pipe, gas cylinders group, mass flow controller, check valve, gas heater, intake valve, pressure-control valve, exhaust valve, video camera, infrared temperature sensor, pressure sensor, thermocouple, sample heating apparatus, specimen holder and computer etc..Using gas cylinders group as gas source, gas heater heats gas, mass flow controller and pressure-control valve control chamber pressure, sample heating apparatus heats sample, optical fiber laser lights sample, achievable gas temperature is 500~600 DEG C, the titanium alloy material for the simulated conditions that pressure is 1.0~1.5MPa and specimen temperature is 600~900 DEG C/component combustion test, higher using test parameters, test accuracies such as the computer program control durations of ignition.The experimental rig is compact-sized, easy for installation, and experimentation cost is low, can satisfy the urgent need of the current and following aero-engine titanium burn evaluating characteristics, and application prospect is extensive.
Description
Technical field
The invention belongs to aero-engine technology field, it is related to a kind of titanium burn experimental rig and its test method,
More particularly, to titanium burn experimental rig and method under the conditions of a kind of Simulated Service.
Background technique
Aero-engine titanium fire is a kind of typical titanium burn cause calamity failure, is endangered huge.High performance turbine starts
The sharp contradiction that demand of the machine to titanium alloy dosage is improved increases with titanium fire tendentiousness highlights, and titanium fire is caused to take place frequently.In addition to foreign countries
Dual-use aero-engine occurred more than 100 and plays titanium fire, and China is in the high-performance aeroengine test run ground in recent years
Occurred a lot of, and not only caused huge economic losses, and also seriously hindered engine and design a large amount of selections to titanium alloy.Effectively
Pre- titanium fire preventing, the titanium alloy dosage for improving compressor, become the problem for restricting the development of advanced aero engine technology.
Titanium alloy material/component combustion test technology is scientific knowledge titanium fire variations rule and mechanism, and building titanium fire is comprehensive
The key core technologies of prevention system not yet form unified experimental rig and method, especially in Simulated Service so far in the world
Under the conditions of realize titanium burn difficulty it is bigger.The U.S. establishes large titanium alloy combustion wind tunnel experimental rig, and to simulation suit
The combustion characteristics of titanium alloy carries out experimental study under the conditions of labour, such as in highest gas flow temperature (455 DEG C) and pressure
A variety of titanium burns are realized under the conditions of (0.965MPa), are that Alloy C Burn-Resistant Titanium Alloy is first in famous F119 and F135
It is widely applied on into aero-engine and provides foundation.
However, domestic structure and technical detail to the corrosion chamber is still not due to foreign technology block etc.
It is clear.Recognize according to the defense report of decryption, titanium burn experimental rig is adopted respectively under the conditions of the Simulated Service of U.S.'s construction
Titanium drop or carbon dioxide laser is used to light a fire as heat source, using small-sized wind tunnel as gas source, wherein titanium drop is as warm
There is the problems such as unstable of lighting a fire in source, laser is confirmed as leading igniting heat source.But the experimental rig is due to using dioxy
Change carbon laser and not only cause that overall structure volume is big, energy consumption is high, but also test efficiency is low, highest gas flow temperature and pressure
The control parameters such as power are not able to satisfy titanium burn evaluating characteristics under the current and following high-performance aeroengine service condition
Urgent need.
Summary of the invention
Goal of the invention: provide in view of the above shortcomings of the prior art it is a kind of can be realized high temperature, high pressure flow conditions and
Ignition effectiveness height and the accurate titanium burn experimental rig of state modulator and method.
The technical solution of invention
A kind of titanium burn experimental rig is provided, which includes combustion chamber (1), laser
(2), gas supply assembly, gas deflation assembly, video camera (12), temperature sensor (13), pressure sensor (14), thermocouple (15), examination
Sample heating device (16), specimen holder (17) and computer control unit (26)；Sample heating apparatus is used for heating sample；
Combustion chamber (1) is closed cavity, and the specimen holder (17) for placing sample is provided in cavity；On the closed cavity
Portion is provided with laser light incident window and observation window, and laser light incident window and observation window are respectively positioned on the top of specimen holder；Computer control
Unit (26) to temperature sensor (13), pressure sensor (14) and thermocouple (15) carry out data acquisition, to laser (2),
Gas supply assembly, gas deflation assembly and sample heating apparatus (16) are controlled；
The closed cavity is connected to gas supply assembly and gas deflation assembly respectively, and gas supply assembly is used to provide to combustion chamber combustion-supporting
Gas (oxygen and/or air), gas deflation assembly are used for exhaust combustion chamber；Combustion chamber is provided with the pressure sensor (14) and temperature
It spends sensor (13), for detecting the intracorporal gas pressure of closing chamber and temperature；Combustion chamber is provided with the thermocouple (15), is used
In the temperature of detection sample；It is provided with video camera above observation window, for shooting sample；Laser light incident window is for injecting laser.
Further, specimen holder (17) is fixed in combustion chamber (1) closed cavity, for sample (18) to be fixedly mounted；
Air supply pipe (3) and exhaust pipe (4) are respectively communicated in the two sides of combustion chamber (1)；
Further, gas supply assembly include air supply pipe (3), gas cylinders group (5), mass flow controller (6), check valve (7),
Gas heater (8) and intake valve (9)；Gas cylinders group (5), mass flow controller (6), check valve (7), gas heater (8)
It is sequentially connected in series with intake valve (9), intake valve (9) is communicated to combustion chamber by air supply pipe (3).
Further, gas deflation assembly includes exhaust pipe (4), pressure-control valve (10) and exhaust valve (11)；Pressure-control valve
(10) in parallel with exhaust valve (11) and be connected to combustion chamber by exhaust pipe (4).
Further, sample heating apparatus (16) is used for heating sample；Preferably, sample heating apparatus is electric heating dress
It sets, the positive and negative anodes of electric heater unit are connected by copper electrode (21) with sample (18).
Further, sample heating apparatus (16) includes positive and negative electrode, conducting wire and direct current pulse power source, direct current pulse power source
Anode, cathode by conducting wire pass through burning chamber shell be connected to electrode, positive and negative electrode is located in closed cavity, positive and negative electrode divide
It is not connected to sample both ends.Certainly other heating equipments that heating can be provided to sample are all possible.Such as by thermally conductive
It manages thermally conductive to sample, or sample is heated etc. by radiant heating device.
Further, pressure sensor (14) and temperature sensor (13) are mounted on combustion chamber (1) shell, and end of probe is stretched
Enter in combustion chamber (1) cavity, measures the gas pressure and temperature of combustion chamber；Thermocouple (15) is threadedly attached to combustion chamber
(1) on shell, it is located at the surface of sample (18), end of probe face sample (18) measures the temperature of sample (18).
Further, computer control unit (26) is to temperature sensor (13), pressure sensor (14) and thermocouple
(15) carry out data acquisition, to laser (2), mass flow controller (6), gas heater (8), pressure-control valve (10) and
Sample heating apparatus (16) is controlled.
Further, laser (2) is optical fiber laser, and thermocouple (15) could alternatively be infrared temperature sensor.
Further, combustion chamber (1) shape is cylindrical body, its shell is double-layer structure, outer layer is 25~40mm thickness
Cast iron housing, internal layer be the thermal insulation layer of 40~80mm thickness, shell by refractory seals washer sealing, can bear in 2.0MPa
Portion's air pressure and 900 DEG C of high temperature etc..
Further, laser light incident window (19) is located at the oblique upper of sample (18), and the laser that laser (2) issues is by swashing
Light entrance window (19) is irradiated to the upper surface of the sample (18) in combustion chamber (1), the folder of laser beam and sample (18) upper surface
Angle is 60 °~75 °, and the light-emitting window of laser (2) is 150~550mm away from the distance on sample (18) surface, and observation window (20) is located at
The oblique upper of sample (18), the combustion for passing through observation window (20) record sample (18) close to temperature sensor (13), video camera (12)
Burn situation.
Further, the air supply pipe (3) is protruded into combustion chamber (1) cavity, the side with the shell of combustion chamber (1) to weld
Formula is tightly connected, and axis is overlapped with the center line of sample (18), gas outlet face sample (18) forward position of air supply pipe (3), away from
The distance in sample (18) forward position is 5~20mm, and gas outlet diameter is 15~30mm.
Further, the exhaust pipe (4) is connected to the other side of the combustion chamber (1) relative to air inlet pipe (3), with combustion chamber
(1) connection type is welding, and the diameter of exhaust pipe (4) is 1.5~2 times of air inlet pipe (3) gas outlet diameter.
Further, the specimen holder (17) includes insulating bar (22), lock-screw (23), sample fixation screw nail (24)
With flange (25)；One end of copper electrode (21) has a circular hole, covers on insulating bar (22), can rotate around insulating bar (22),
And can be locked on insulating bar (22) by lock-screw (23), the other end of copper electrode (21) has a rectangular channel, energy
Sample (18) enough are installed, and sample (18) is fixed by sample fixation screw nail (24), are adjacent to sample (18) in rectangle
In slot；Two copper electrodes (21) are electrically connected with the positive and negative anodes of sample heating apparatus (16) respectively, and two copper electrodes (21) are right respectively
Answer the both ends of sample (18)；Insulating bar (22) is threadedly attached on flange (25) (bar material that preferably, insulate is ceramics)；
Flange (25) is mounted in combustion chamber (1) closing inner chamber.
Further, the output power of the optical fiber laser (2) is continuously adjusted within the scope of 501~700W, and hot spot is straight
Diameter be 0.5~5mm, out when light between be continuously adjusted.
Further, the power of the sample heating apparatus (16) is 5~50kW, sample (18) can be heated to 900 DEG C,
There is cooling system simultaneously, sample heating apparatus (16) and copper electrode (21) temperature is excessively high when preventing heating sample (18).
Further, the gas heater (8) is pipeline type air electric heater, and power is 100~500kW, air-flow
Heating maximum temperature is 600 DEG C.
Further, gas cylinders group (5) the output gas flow pressure is 1.0~1.5MPa.
Further, the temperature measurer probe of the temperature sensor (13) is 100~300mm away from specimen surface distance.
Test parameters (sample (18) heating temperature, combustion chamber (1) interior gas can be arranged in the computer control unit (26)
Body pressure, combustion chamber (1) interior gas temperature and the duration of ignition), thermocouple (15) collected sample (18) temperature, pressure are passed
The interior gas pressure in sensor (14) collected combustion chamber (1) and temperature sensor (13) collected combustion chamber (1) interior gas temperature
Degree is compared with the test parameters of setting respectively, and then automatically controls the power on/off of sample heating apparatus (16), pressure control
The unlatching amplitude of valve (10) and mass flow controller (6), the power on/off of gas heater (8) and optical fiber laser (2) go out
Between light time, the automatic control to sample (18) temperature, combustion chamber (1) interior gas pressure and temperature and the duration of ignition is realized.
A kind of titanium burn test method using above-mentioned apparatus is also provided, which comprises the following steps:
(1) laser power supply is opened, laser issues positioning feux rouges, and feux rouges injects burning chamber through laser light incident window
Body；
(2) sample is fixed on specimen holder, specimen holder protrudes into combustion chamber, and adjustment specimen holder makes sample in water
Level state, while the red light irradiation for issuing laser fixes specimen holder to the region to be fired of specimen surface；
(3) control computer control unit is opened, test parameters, including specimen temperature (600~900 DEG C), burning are set
Gas temperature (500~600 DEG C) and the duration of ignition (1~10s) in gas pressure inside (1.0~1.5MPa), combustion chamber；
(4) exhaust valve, gas cylinders group pressure reducing valve and intake valve, gas circuit ventilation are opened；
(5) exhaust valve is closed, computer control unit acquires each sensing data, by carrying out with the test parameters of setting
Comparison automatically controls sample heating apparatus, pressure-control valve, mass flow controller and gas heater, make trystate with
It is consistent that test parameters is set；
(6) after specimen temperature, burning gas pressure inside and temperature reach setting value and stablize 5~10s, camera shooting is opened
Machine and optical fiber laser, computer control unit closes optical fiber laser after the preset duration of ignition, terminates igniting；
(7) after sample burning, video camera, sample heating apparatus and gas heater are closed, closes gas cylinders group decompression
Valve and intake valve stop gas supply, open exhaust valve, are exhausted；
(8) exhaust terminates, and sample removes specimen holder after being fully cooled, and removes sample.
Beneficial effect
(1) present invention is lighted a fire using the heat source that optical fiber laser is rapidly heated as titanium alloy material/component partial,
Not only ignition effectiveness is high, but also source stability of lighting a fire is good；(2) using gas cylinders group and gas heater as air supply system, Ke Yishi
The titanium burn test of 600 DEG C existing, 1.5MPa Simulated Service Environment；It (3) being capable of adding sample by electrical heating method
Hot temperature is increased to 900 DEG C of progress combustion tests, can be realized the titanium alloy material of resistance to higher temperature or the combustion test of component；
(4) using the tests such as gas temperature and pressure and duration of ignition ginseng in computer program Control Assay heating temperature, combustion chamber
Number, test accuracy is higher, and easily operated, safe and reliable；(5) experimental rig is compact-sized, easy for installation, experimentation cost
It is low, it can satisfy the demand of the current and following aero-engine titanium burn evaluating characteristics, application prospect is extensive.
Detailed description of the invention
Fig. 1 is the structure principle chart of experimental rig of the present invention；
Fig. 2 is specimen holder figure；
Fig. 3 is the section view of Fig. 2；
Wherein: the combustion chamber 1-；2- optical fiber laser；3- air supply pipe；4- exhaust pipe；5- gas cylinders group；The control of 6- mass flow
Device；7- check valve；8- gas heater；9- intake valve；10- pressure-control valve；11- exhaust valve；12- video camera；13- temperature passes
Sensor；14- pressure sensor；15- thermocouple；16- sample heating apparatus；17- specimen holder；18- sample；19- laser light incident
Window；20- observation window；21- copper electrode；22- insulating bar；23- lock-screw；24- sample fixation screw nail；25- flange；26- is calculated
Machine.
Specific embodiment
The present invention is further explained in the light of specific embodiments, but the present invention is not limited to following embodiments.
Embodiment 1
Titanium burn experimental rig under the conditions of a kind of Simulated Service, including combustion chamber (1), optical fiber laser (2), gas supply
Manage (3), exhaust pipe (4), gas cylinders group (5), mass flow controller (6), check valve (7), gas heater (8), intake valve
(9), pressure-control valve (10), exhaust valve (11), video camera (12), temperature sensor (13), pressure sensor (14), thermocouple
(15), sample heating apparatus (16), specimen holder (17) and computer (26).
Specimen holder (17) includes two copper electrodes (21), insulating bar (22), electrode fixing screws (23), sample fixation screw
Follow closely (24) and flange (25).One end of copper electrode (21) has a circular hole, covers on insulating bar (22), makes it can be around insulating bar
(22) it rotates, fixed by electrode fixing screws (23), the other end has a rectangular channel, and sample (18) is put into rectangular channel, sample
Fixing screws (24) compress the upper surface of sample (18), and the lower surface of sample (18) is made to be adjacent to the lower surface of rectangular channel；Two copper
Electrode (21) is connected with the positive and negative anodes of sample heating apparatus (16) respectively, and clamps the both ends of sample (18), when test, electric current
Sample is flowed through, sample is made to heat up.Insulating bar (22) is threadedly attached on flange (25), and material is ceramics, diameter 15mm；
Flange (25) is mounted on combustion chamber (1) shell front, realizes the sealing with combustion chamber (1) shell by elevated-temperature seal washer；It adjusts
Whole specimen holder (17) can make sample (18) be located at the middle position of combustion chamber (1) cavity and be in a horizontal state.
Combustion chamber (1) is the cylindrical body of diameter 500mm, long 500mm, and shell outer layer wall thickness 30mm, material is cast iron, shell
Internal layer is the thermal insulation layer of 40mm, and shell can bear the air pressure inside and 900 DEG C of height of 2.0MPa by refractory seals washer sealing
Temperature；Thermocouple is threadedly attached on combustion chamber (1) shell, is located at the surface of sample (18), end of probe face sample
(18), for measuring the temperature of sample (18), end of probe probe is 240mm away from specimen surface distance.Upper part of the housing is provided with sharp
Light entrance window (19) and observation window (20), laser light incident window (19) are located at the diagonally forward of sample (18), axis and combustion chamber (1)
Axis is in 60 ° of angles, and observation window (20) is located at the rear ramp of sample (18), close to temperature sensor (13).Optical fiber laser (2)
Light-emitting window is fixed on laser light incident window (19), and the laser beam of sending is irradiated to combustion chamber (1) by laser light incident window (19)
The angle of the upper surface of interior sample (18), laser beam and sample (18) upper surface is 60 °, and optical fiber laser (2) goes out light
Distance of the mouth away from sample (18) surface is 380mm；Video camera (12) is located at observation window (20) outside, is recorded and is tried by observation window (20)
The combustion case of sample (18)；Pressure sensor (14) and temperature sensor (13) are mounted on combustion chamber (1) shell, and end of probe is stretched
Enter in combustion chamber (1) cavity, measures the gas pressure and temperature of combustion chamber.
Air supply pipe (3) protrudes into its cavity from the side of combustion chamber (1), in a welding manner with the shell of combustion chamber (1)
It is tightly connected, axis is overlapped with the center line of sample (18), and the gas outlet of air supply pipe (3) is away from the distance in sample (18) forward position
20mm, gas outlet diameter are 30mm；Gas cylinders group (5), mass flow controller (6), check valve (7), gas heater (8) and into
Air valve (9) is pressed and is connected on from the distant to the near on air supply pipe (3) at a distance from combustion chamber (1)；Gas cylinders group is that combustion chamber (1) provides high pressure
Gas, mass flow controller (6) control gas flow, and gas heater (8) can heat high pressure gas, check valve
(7) prevent the high-temperature gas in gas heater (8) from flowing back into mass flow controller (6) and gas cylinders group (5), intake valve
(9) on-off of control gas supply.
Exhaust pipe (4) is connected to the other side of the combustion chamber (1) relative to air inlet pipe (3), the connection type with combustion chamber (1)
Diameter for welding, exhaust pipe (4) is 50mm, and pressure-control valve (10) and exhaust valve (11) are connected in parallel on exhaust pipe (4)；Pressure
Control valve (10) opens row pressure after inlet pressure reaches setting value, for controlling combustion chamber (1) interior gas pressure intensity, exhaust valve
(11) for testing final vacuum.
Sample (18) is 70mm × 30mm × 2mm rectangular specimen.
The output power of optical fiber laser (2) is continuously adjusted within the scope of 501~700W, spot diameter 3mm, out when light
Between be continuously adjusted.
The power 30kW of sample heating apparatus (16), while there is cooling system, sample adds when preventing heating sample (18)
Thermal (16) and copper electrode (21) temperature are excessively high.
Gas heater (8) is pipeline type air electric heater, and power 300kW, it is 600 that air-flow, which heats maximum temperature,
℃。
Gas cylinders group (5) output gas flow pressure is 1.0~1.5MPa.
Test parameters (sample (18) temperature, combustion chamber (1) interior gas pressure, burning is arranged by software in computer (26)
The interior gas temperature in room (1) and the duration of ignition), thermocouple (15) collected sample (18) temperature, pressure sensor (14) are adopted
The interior gas pressure in combustion chamber (1) and temperature sensor (13) collected combustion chamber (1) interior gas temperature collected respectively with set
The test parameters set compares, and then automatically controls power on/off, pressure-control valve (10) and the matter of sample heating apparatus (16)
The unlatching amplitude of flow controller (6) of measuring, the power on/off of gas heater (8) and optical fiber laser (2) when going out light between, realize
Automatic control to sample (18) temperature, combustion chamber (1) interior gas pressure and temperature and the duration of ignition.
The test method of above-mentioned experimental rig comprises the following steps:
(1) laser power supply is opened, laser issues positioning feux rouges, and feux rouges injects burning chamber through laser light incident window
Body；
(2) sample is fixed on specimen holder, specimen holder protrudes into combustion chamber, and adjustment specimen holder makes sample in water
Level state, while the red light irradiation for issuing laser fixes specimen holder to the region to be fired of specimen surface；
(3) control computer is opened, test parameters, including 800 DEG C of specimen temperature, burning gas pressure inside are set
600 DEG C of gas temperature and duration of ignition 5s in 1.5MPa, combustion chamber；
(4) exhaust valve, gas cylinders group pressure reducing valve and intake valve, gas circuit ventilation are opened；
(5) exhaust valve is closed, each sensing data of computer acquisition is compared by the test parameters with setting, from
Dynamic Control Assay heating device, pressure-control valve, mass flow controller and gas heater test trystate and setting
Parameter is consistent；
(6) video camera and laser are opened after setting value stablizes 5s after specimen temperature, burning gas pressure inside and temperature
Device, computer program automatically closing laser after by 5s, terminates igniting；
(7) after sample burning, video camera, sample heating apparatus and gas heater are closed, closes gas cylinders group decompression
Valve and intake valve stop gas supply, open exhaust valve, are exhausted；
(8) exhaust terminates, and sample removes specimen holder after being fully cooled, and removes sample.
Embodiment 2
Titanium burn experimental rig under the conditions of a kind of Simulated Service, including combustion chamber (1), optical fiber laser (2), gas supply
Manage (3), exhaust pipe (4), gas cylinders group (5), mass flow controller (6), check valve (7), gas heater (8), intake valve
(9), pressure-control valve (10), exhaust valve (11), video camera (12), temperature sensor (13), pressure sensor (14), thermocouple
(15), sample heating apparatus (16), specimen holder (17) and computer (26).
Specimen holder (17) includes two copper electrodes (21), insulating bar (22), electrode fixing screws (23), sample fixation screw
Follow closely (24) and flange (25).One end of copper electrode (21) has a circular hole, covers on insulating bar (22), makes it can be around insulating bar
(22) it rotates, fixed by electrode fixing screws (23), the other end has a rectangular channel, and sample (18) is put into rectangular channel, sample
Fixing screws (24) compress the upper surface of sample (18), and the lower surface of sample (18) is made to be adjacent to the lower surface of rectangular channel；Two copper
Electrode (21) is connected with the positive and negative anodes of sample heating apparatus (16) respectively, and clamps the both ends of sample (18), when test, electric current
Sample is flowed through, sample is made to heat up.Insulating bar (22) is threadedly attached on flange (25), and material is ceramics, diameter 12mm；
Flange (25) is mounted on combustion chamber (1) shell front, realizes the sealing with combustion chamber (1) shell by elevated-temperature seal washer；It adjusts
Whole specimen holder (17) can make sample (18) be located at the middle position of combustion chamber (1) cavity and be in a horizontal state.
Combustion chamber (1) is 500mm × 400mm × 400mm cuboid, and shell outer layer wall thickness 35mm, material is stainless steel,
Shell internal layer is the thermal insulation layer of 60mm, and shell is by refractory seals washer sealing；Thermocouple (15) is threadedly attached to burning
On room (1) shell, it is located at the surface of sample (18), end of probe face sample (18) is visited for measuring the temperature of sample (18)
It is 190mm that end probe, which is surveyed, away from specimen surface distance.Upper part of the housing is provided with laser light incident window (19) and observation window (20), and laser enters
The diagonally forward that window (19) is located at sample (18) is penetrated, axis and horizontal direction are in 70 ° of angles, and observation window (20) is located at the oblique of sample (18)
Rear, close to temperature sensor (13).The light-emitting window of optical fiber laser (2) is fixed on laser light incident window (19), and sending swashs
Light light beam is irradiated to the upper surface of the sample (18) in combustion chamber (1), laser beam and sample by laser light incident window (19)
(18) angle of upper surface is 70 °, and the light-emitting window of optical fiber laser (2) is 320mm away from the distance on sample (18) surface；Video camera
(12) it is located at observation window (20) outside, passes through the combustion case of observation window (20) record sample (18)；Pressure sensor (14) and temperature
Degree sensor (13) is mounted on combustion chamber (1) shell, and end of probe protrudes into combustion chamber (1) cavity, measures the gas of combustion chamber
Pressure and temperature.
Air supply pipe (3) protrudes into its cavity from the side of combustion chamber (1), is threadedly coupled with the shell of combustion chamber (1),
Axis is overlapped with the center line of sample (18), and the gas outlet of air supply pipe (3) is 15mm, gas outlet away from the distance in sample (18) forward position
Diameter is 20mm；Gas cylinders group (5), mass flow controller (6), check valve (7), gas heater (8) and intake valve (9) press with
The distance of combustion chamber (1) is connected on from the distant to the near on air supply pipe (3)；Gas cylinders group is that combustion chamber (1) provides high pressure gas, quality stream
Amount controller (6) controls gas flow, and gas heater (8) can heat high pressure gas, and check valve (7) prevents gas from adding
High-temperature gas in hot device (8) flows back into mass flow controller (6) and gas cylinders group (5), and intake valve (9) control gas supply leads to
It is disconnected.
Exhaust pipe (4) is connected to the other side of the combustion chamber (1) relative to air inlet pipe (3), the connection type with combustion chamber (1)
To be threadedly coupled, the diameter of exhaust pipe (4) is 40mm, and pressure-control valve (10) and exhaust valve (11) are connected in parallel on exhaust pipe (4)；
Pressure-control valve (10) opens row pressure after inlet pressure reaches setting value, for controlling combustion chamber (1) interior gas pressure intensity, is vented
Valve (11) is for testing final vacuum.
Sample (18) is 50mm × 20mm × 3mm rectangular specimen.
The output power of optical fiber laser (2) is continuously adjusted within the scope of 501~700W, spot diameter 2mm, out when light
Between be continuously adjusted.
The power 15kW of sample heating apparatus (16), while there is cooling system, sample adds when preventing heating sample (18)
Thermal (16) and copper electrode (21) temperature are excessively high.
Gas heater (8) is pipeline type air electric heater, and power 200kW, it is 600 that air-flow, which heats maximum temperature,
℃。
Gas cylinders group (5) output gas flow pressure is 1.0~1.5MPa.
By computer (26) setting test parameters, (sample (18) temperature, combustion chamber (1) interior gas pressure, combustion chamber (1) are interior
Gas temperature and the duration of ignition), by thermocouple (15) collected sample (18) temperature, pressure sensor (14) collected combustion
Burn room (1) interior gas pressure and temperature sensor (13) collected combustion chamber (1) interior gas temperature respectively with the test of setting
Parameter compares, and then the power on/off of Control Assay heating device (16), pressure-control valve (10) and mass flow controller
(6) power on/off of unlatching amplitude, gas heater (8) and optical fiber laser (2) when going out light between, realize to sample (18) temperature
The control of degree, combustion chamber (1) interior gas pressure and temperature and the duration of ignition.
The test method of above-mentioned experimental rig comprises the following steps:
(1) laser power supply is opened, laser issues positioning feux rouges, and feux rouges injects burning chamber through laser light incident window
Body；
(2) sample is fixed on specimen holder, specimen holder protrudes into combustion chamber, and adjustment specimen holder makes sample in water
Level state, while the red light irradiation for issuing laser fixes specimen holder to the region to be fired of specimen surface；
(3) control computer is opened, test parameters, including 600 DEG C of specimen temperature, burning gas pressure inside are set
500 DEG C of gas temperature and duration of ignition 6s in 1.0MPa, combustion chamber；
(4) exhaust valve, gas cylinders group pressure reducing valve and intake valve, gas circuit ventilation are opened；
(5) exhaust valve is closed, each sensing data of computer acquisition is compared by the test parameters with setting, from
Dynamic Control Assay heating device, pressure-control valve, mass flow controller and gas heater test trystate and setting
Parameter is consistent；
(6) video camera and optical fiber are opened after setting value stablizes 5s after specimen temperature, burning gas pressure inside and temperature
Laser, the computer program automatically closing laser after 6s terminate igniting；
(7) after sample burning, video camera, sample heating apparatus and gas heater are closed, closes gas cylinders group decompression
Valve and intake valve stop gas supply, open exhaust valve, are exhausted；
(8) exhaust terminates, and sample removes specimen holder after being fully cooled, and removes sample.
Claims (10)
1. a kind of titanium burn experimental rig, which includes combustion chamber (1), laser (2), gas supply
Component, gas deflation assembly, video camera (12), temperature sensor (13), pressure sensor (14), thermocouple (15), sample heating dress
Set (16), specimen holder (17) and computer control unit (26)；Sample heating apparatus is used for heating sample；
Combustion chamber (1) is closed cavity, and the specimen holder (17) for placing sample is provided in cavity；The closed cavity top is set
It is equipped with laser light incident window and observation window, laser light incident window and observation window are respectively positioned on the top of specimen holder；Computer control unit
(26) data acquisition is carried out to temperature sensor (13), pressure sensor (14) and thermocouple (15), to laser (2), gas supply
Component, gas deflation assembly and sample heating apparatus (16) are controlled；
The closed cavity is connected to gas supply assembly and gas deflation assembly respectively, and gas supply assembly is used to provide combustion-supporting gas to combustion chamber
(especially oxygen and/or air or both gaseous mixture), gas deflation assembly are used for exhaust combustion chamber；Combustion chamber is provided with the pressure
Sensor (14) and temperature sensor (13), for detecting the intracorporal gas pressure of closing chamber and temperature；Combustion chamber is arranged
Thermocouple (15) are stated, for detecting the temperature of sample；It is provided with video camera above observation window, for shooting sample；Laser light incident
Window is for injecting laser.
2. a kind of titanium burn experimental rig as described in claim 1, it is characterised in that: specimen holder (17) is fixed on combustion
It burns in room (1) closed cavity, for sample (18) to be fixedly mounted；Air supply pipe (3) and exhaust pipe (4) are respectively communicated in combustion chamber
(1) two sides.
3. a kind of titanium burn experimental rig as claimed in claim 2, it is characterised in that: gas supply assembly includes air supply pipe
(3), gas cylinders group (5), mass flow controller (6), check valve (7), gas heater (8) and intake valve (9)；Gas cylinders group (5),
Mass flow controller (6), check valve (7), gas heater (8) and intake valve (9) are sequentially connected in series, and intake valve (9) passes through confession
Tracheae (3) is communicated to combustion chamber.
4. a kind of titanium burn experimental rig as claimed in claim 3, it is characterised in that: gas deflation assembly includes exhaust pipe
(4), pressure-control valve (10) and exhaust valve (11)；Pressure-control valve (10) and exhaust valve (11) parallel connection simultaneously pass through exhaust pipe (4)
It is connected to combustion chamber.
5. a kind of titanium burn experimental rig as claimed in claim 4, it is characterised in that: sample heating apparatus (16) includes
Positive and negative electrode, conducting wire and direct current pulse power source, anode, the cathode of direct current pulse power source are connected by conducting wire across burning chamber shell
To electrode, positive and negative electrode is located in closed cavity, and positive and negative electrode is connected to sample both ends.
6. a kind of titanium burn experimental rig as claimed in claim 5, it is characterised in that: pressure sensor (14) and thermoelectricity
Even (15) are mounted on combustion chamber (1) shell, and end of probe protrudes into combustion chamber (1) cavity, measure combustion chamber gas pressure and
Temperature；Temperature sensor (13) is threadedly attached on combustion chamber (1) shell, is located at the surface of sample (18), end of probe
Face sample (18) measures the temperature of sample (18).
7. a kind of titanium burn experimental rig as claimed in claim 6, it is characterised in that: computer control unit (26)
Data acquisition is carried out to temperature sensor (13), pressure sensor (14) and thermocouple (15), to laser (2), mass flow
Controller (6), gas heater (8), pressure-control valve (10) and sample heating apparatus (16) are controlled.
8. a kind of titanium burn experimental rig as claimed in claim 7, it is characterised in that: laser (2) is optical-fiber laser
Device；It is highly preferred that thermocouple (15) could alternatively be infrared temperature sensor.
9. a kind of titanium burn experimental rig as claimed in claim 8, it is characterised in that: the specimen holder (17) includes
Insulating bar (22), lock-screw (23), sample fixation screw nail (24) and flange (25)；One end of copper electrode (21) has a circle
Hole covers on insulating bar (22), can rotate around insulating bar (22), and can be locked by lock-screw (23) in insulating bar
(22) on, the other end of copper electrode (21) has a rectangular channel, can install sample (18), and follow closely (24) by sample fixation screw
Sample (18) is fixed, is adjacent to sample (18) in rectangular channel；Two copper electrodes (21) respectively with sample heating apparatus
(16) positive and negative anodes electrical connection, two copper electrodes (21) respectively correspond the both ends of sample (18)；Insulating bar (22) is connected by screw thread
(bar material that preferably, insulate is ceramics) is connect on flange (25)；Flange (25) is mounted in combustion chamber (1) closing inner chamber.
10. a kind of test method using one of the claims 1-9 titanium burn experimental rig, comprises the following steps:
(1) laser power supply is opened, laser issues positioning feux rouges, and feux rouges injects combustion chamber cavity through laser light incident window；
(2) sample is fixed on specimen holder, specimen holder protrudes into combustion chamber, and adjustment specimen holder keeps sample horizontal
State, while the red light irradiation for issuing laser fixes specimen holder to the region to be fired of specimen surface；
(3) control computer control unit is opened, is arranged in test parameters, including specimen temperature (600~900 DEG C), combustion chamber
Gas temperature (500~600 DEG C) and the duration of ignition (1~10s) in gas pressure (1.0~1.5MPa), combustion chamber；
(4) exhaust valve, gas cylinders group pressure reducing valve and intake valve, gas circuit ventilation are opened；
(5) exhaust valve is closed, computer control unit acquires each sensing data, by carrying out pair with the test parameters of setting
Than automatically controlling sample heating apparatus, pressure-control valve, mass flow controller and gas heater, making trystate and set
It is consistent to set test parameters；
(6) after specimen temperature, burning gas pressure inside and after temperature reaches setting value and stablize 5~10s, open video camera and
Optical fiber laser, computer control unit closes optical fiber laser after the preset duration of ignition, terminates igniting；
(7) after sample burning, video camera, sample heating apparatus and gas heater are closed, close gas cylinders group pressure reducing valve and
Intake valve stops gas supply, opens exhaust valve, is exhausted；
(8) exhaust terminates, and sample removes specimen holder after being fully cooled, and removes sample.
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| CN112034004A (en) * | 2020-08-12 | 2020-12-04 | 北京科技大学 | Test system and method for testing combustion risk of magnesium alloy |
| CN112611552A (en) * | 2020-11-27 | 2021-04-06 | 中国航发四川燃气涡轮研究院 | Aeroengine high temperature high altitude ventilation valve test device |
| CN113567614A (en) * | 2021-09-08 | 2021-10-29 | 清华大学 | Multi-working-condition metal droplet ignition experimental device |
| CN113654804A (en) * | 2021-07-15 | 2021-11-16 | 哈尔滨工程大学 | Constant volume bomb air inlet system for high-speed mixing of multi-component gases and using method thereof |
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| CN112034004A (en) * | 2020-08-12 | 2020-12-04 | 北京科技大学 | Test system and method for testing combustion risk of magnesium alloy |
| CN112034004B (en) * | 2020-08-12 | 2021-06-29 | 北京科技大学 | Test system and method for testing combustion risk of magnesium alloy |
| CN112611552A (en) * | 2020-11-27 | 2021-04-06 | 中国航发四川燃气涡轮研究院 | Aeroengine high temperature high altitude ventilation valve test device |
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| CN113654804A (en) * | 2021-07-15 | 2021-11-16 | 哈尔滨工程大学 | Constant volume bomb air inlet system for high-speed mixing of multi-component gases and using method thereof |
| CN113567614A (en) * | 2021-09-08 | 2021-10-29 | 清华大学 | Multi-working-condition metal droplet ignition experimental device |
| CN113959932A (en) * | 2021-09-27 | 2022-01-21 | 中国人民警察大学 | Fire scene combustion improver material evidence weathering effect standard test box |
| CN114441706A (en) * | 2022-01-24 | 2022-05-06 | 上海交通大学 | Metal combustion performance evaluation system and working method thereof |
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Application publication date: 20190823 |