Rotational flow mixer, multi-fuel spray gun and thermal barrier coating environment test assessment device

Abstract

The invention discloses a rotational flow mixer, a multi-fuel spray gun and a thermal barrier coating environment test assessment device, and the rotational flow mixer comprises a mixer shell; the gas / liquid fuel nozzle comprises a gas fuel supply device and a liquid fuel supply device; the liquid fuel supply device comprises a liquid fuel inlet connector, a liquid fuel inlet pressure stabilizing cavity and a liquid fuel injection opening, and a liquid fuel swirler is arranged in the liquid fuel injection opening. The gas fuel supply device comprises a gas fuel inlet connector, a gas fuel inlet pressure stabilizing cavity and a gas fuel injection opening, and a gas fuel swirler is arranged in the gas fuel injection opening. And the air / particle cyclone is arranged in the cavity of the mixer shell. The swirl mixer at the head of the flame spray gun is designed into two fuel channels, and the swirler is used for pre-swirling the fuel, so that the initial atomization effect of the fuel is improved, and it is ensured that different types of fuel can be well combusted on the flame spray gun.

Description

Technical Field

[0001] The present invention relates to the field of aeroengines, and particularly to a swirl mixer, a multi-fuel spray gun, and a thermal barrier coating environmental test assessment device. Background Art

[0002] As a simple and efficient heat insulation device, the thermal barrier coating is applied to various hot-end components of aeroengines. During actual use, affected by factors such as fuel type, particle erosion, and hot spots, the thermal barrier coating may fail, thus affecting the working life or reliability of the engine. As the core device for converting chemical energy into thermal energy on the engine, the thermal barrier coating of the combustion chamber not only has to withstand the local temperature non-uniformity caused by fuel combustion, the high stress caused by aerodynamic force or structural vibration, but also has to withstand the chemical action and erosion of intermediate reaction products and final products (such as water vapor, etc.) during the fuel combustion process on the coating material, the pollution formed by the fuel itself adhering to the coating surface, the modification of the thermal barrier coating by soot or carbon black after combustion, and the physical and chemical process effects such as the erosion of the coating by the combustion chamber swallowing water / sand / foreign objects, etc. The working service environment is very complex. In order to give full play to the positive effects of the thermal barrier coating on major equipment such as aeroengines, it is necessary to carry out a thermal barrier coating thermo-mechanical-chemical coupling environmental assessment test that simulates the real operating environment to predict in advance the cracking and spalling of the thermal barrier coating before formal service and to guide the design and use of the thermal barrier coating. The thermal barrier coating environmental test platform is a relatively widely used thermal barrier coating assessment device, mainly composed of a multi-fuel spray gun, a specimen and a clamping device, a gas supply device, a test device, an exhaust system, etc. Among them, the multi-fuel spray gun is the core device for providing a simulation of the real working state of the combustion chamber.

[0003] For the existing multi-fuel spray guns used in the thermal barrier coating thermo-mechanical-chemical coupling environmental assessment test of aeroengines, it is difficult to switch fuels, there is no general spray gun for the mixed combustion of SAF fuel, hydrogen fuel, and diesel with air. In addition, there are also problems such as uneven mixing of fuel and air and poor atomization effect of liquid fuel, resulting in low combustion efficiency and high consumption during the environmental test process. Summary of the Invention

[0004] In view of this, the present invention provides a swirl mixer, a multi-fuel spray gun, and a thermal barrier coating environmental test assessment device to solve the problem that the current spray gun cannot mix and burn multiple fuels with air and has low combustion efficiency.

[0005] In the first aspect, the present invention provides a swirl mixer, comprising:

[0006] A mixer housing with a cavity inside, and a spray gun gas / particle inlet pipe and a joint communicating with the cavity are arranged on the mixer housing;

[0007] A gas / liquid fuel nozzle is disposed in the cavity of a mixer housing and connected to the mixer housing. The gas / liquid fuel nozzle includes a gaseous fuel supply device and a liquid fuel supply device. The liquid fuel supply device includes a liquid fuel inlet joint, a liquid fuel inlet pressure stabilizing chamber, and a liquid fuel injection port that are arranged in communication in sequence from the front end to the rear end. A liquid fuel swirler is disposed in the liquid fuel injection port. The gaseous fuel supply device includes a gaseous fuel inlet joint, a gaseous fuel inlet pressure stabilizing chamber, and a gaseous fuel injection port that are arranged in communication in sequence from the front end to the rear end. A gaseous fuel swirler is disposed in the gaseous fuel injection port.

[0008] An air / particle swirler is disposed in the cavity of the mixer housing and is located outside the gaseous fuel injection port. The air / particle swirler is configured to swirl and mix the air or particles entering the cavity of the mixer housing, and mix the mixed air or particles with the gaseous fuel and the liquid fuel.

[0009] The beneficial effects of the above swirl mixer are as follows: The swirl mixer at the head of the flame spray gun is designed with two fuel channels to supply gaseous fuel and liquid fuel respectively. The liquid fuel swirler is used to pre-swirl the liquid fuel, and the gaseous fuel swirler is used to pre-swirl the gaseous fuel, improving the initial atomization effect of the fuel, ensuring that different types of fuel can achieve good arcs and combustion on the flame spray gun, realizing real-time switching of fuel types without affecting the coating assessment test, and thus enabling the flame spray gun to use multiple fuels simultaneously.

[0010] In an alternative embodiment, the liquid fuel supply device is disposed in the central region of the nozzle, and the gaseous fuel supply device is disposed outside the liquid fuel supply device.

[0011] Or, the gaseous fuel supply device is disposed in the central region of the nozzle, and the liquid fuel supply device is disposed outside the gaseous fuel supply device.

[0012] In an alternative embodiment, a first partition is disposed between the liquid fuel inlet pressure stabilizing chamber and the liquid fuel injection port, and a liquid fuel diversion port for communicating the liquid fuel inlet pressure stabilizing chamber and the liquid fuel injection port is disposed on the first partition.

[0013] And / or, a second partition is disposed between the gaseous fuel inlet pressure stabilizing chamber and the gaseous fuel injection port, and a gaseous fuel inlet diversion hole for communicating the gaseous fuel inlet pressure stabilizing chamber and the gaseous fuel injection port is disposed on the second partition.

[0014] In an alternative embodiment, the air / particle cyclone includes a primary air cyclone, a secondary air cyclone, a venturi tube, and a cyclone outlet sleeve. The primary air cyclone is disposed inside the venturi tube. There is a ventilation passage between the venturi tube and the cyclone outlet sleeve. The secondary air cyclone is disposed in the ventilation passage. The cyclone outlet sleeve is connected to the mixer housing. The gas fuel injection port and the liquid fuel injection port of the gas / liquid fuel nozzle are inserted into the interior of the venturi tube.

[0015] In an alternative embodiment, the inner diameters of the venturi tube and the cyclone outlet sleeve gradually decrease from the front end to the rear end.

[0016] The rear end of the gas fuel injection port is arranged in an inclined form pointing to the venturi tube, so that the gas fuel ejected from the gas fuel injection port is sprayed towards the venturi tube.

[0017] In an alternative embodiment, the liquid fuel injection port is arranged in a converging-diverging form from the front end to the rear end, so as to utilize the centrifugal force generated by the swirling of the liquid fuel cyclone to form an effect of centrifugal atomization.

[0018] In an alternative embodiment, the air / particle cyclone is arranged in a converging-diverging form from the front end to the rear end.

[0019] In a second aspect, the present invention provides a multi-fuel spray gun, comprising:

[0020] A spray gun combustion tube, on which a spray gun igniter is provided;

[0021] A swirl mixer, disposed at the front end of the spray gun combustion tube. The output port of the air / particle cyclone in the swirl mixer is communicated with the spray gun combustion tube;

[0022] A nozzle, communicatively arranged at the rear end of the spray gun combustion tube;

[0023] A cooling structure, disposed around the spray gun combustion tube.

[0024] In an alternative embodiment, the nozzle is in the shape of a converging-diverging Laval nozzle from the front end to the rear end;

[0025] And / or, a spray gun outlet temperature measuring device is arranged at the outlet position of the nozzle;

[0026] And / or, the cooling structure includes a spray gun cooling sleeve sleeved around the spray gun combustion tube, and the flow direction of the cooling medium introduced into the spray gun cooling sleeve is opposite to the jet direction of the flame of the spray gun combustion tube.

[0027] In a third aspect, the present invention provides a thermal barrier coating environmental test assessment device, comprising:

[0028] Thermal barrier coating environmental assessment test chamber;

[0029] An air circulation system, which is arranged on the thermal barrier coating environmental assessment test chamber and is used for exchanging the air inside the thermal barrier coating environmental assessment test chamber with the outside air;

[0030] A test platform, which is arranged inside the thermal barrier coating environmental assessment test chamber;

[0031] A test piece with a thermal barrier coating is arranged on the test platform through a universal bracket;

[0032] At least one of the multi-fuel spray guns is arranged on the test platform. The output port of the multi-fuel spray gun faces the test piece with a thermal barrier coating. The multi-fuel spray gun is externally connected to a multi-fuel spray gun high-pressure gas source, a gas fuel supply device, a liquid fuel supply device, a cooling medium supply device, and an igniter power supply.

[0033] In an alternative embodiment, a plurality of positioning holes are provided at the top of the test platform, and the universal bracket is adapted to the positioning holes; the multi-fuel spray gun is arranged on the test platform through a positioning bracket, and the positioning bracket is adapted to the positioning holes.

[0034] In an alternative embodiment, the multi-fuel spray gun is further connected to a scouring particle supply and mixing device; the scouring particle supply and mixing device has an open state when considering the influence of external particles on the thermal barrier coating and a closed state when not considering the influence of external particles on the thermal barrier coating;

[0035] The scouring particle supply and mixing device includes a high-pressure gas source shunt device, a powder fluidization pipe, a gas-particle mixing pipe, a spray gun gas / particle inlet pipe and a joint, a powder supply device, and a particle powder recovery device;

[0036] The outlet end of the high-pressure gas source shunt device is communicated with the powder fluidization pipe;

[0037] The powder fluidization pipe is arranged in a bent shape and the middle position is lower than the positions at both ends. One end of the powder fluidization pipe is connected to the powder supply device, and the other end of the powder fluidization pipe is connected to the gas-particle mixing pipe;

[0038] The side of the gas-particle mixing pipe is connected to the spray gun gas / particle inlet pipe and the joint;

[0039] The particle powder recovery device has a feed inlet and a discharge outlet. The feed inlet of the particle powder recovery device is connected to the gas-particle mixing pipe, and the discharge outlet of the particle powder recovery device is connected to the powder supply device.

[0040] In an alternative embodiment, the high-pressure gas source shunting device includes an inlet pipe joint, a gas source outlet gas collecting chamber, and a gas source outlet shunting pipe. The inlet pipe joint is connected to the high-pressure gas source outlet. One end of the gas source outlet gas collecting chamber is connected to the inlet pipe joint, and the other end of the gas source outlet gas collecting chamber is connected to the gas source outlet shunting pipe. A plurality of the gas source outlet shunting pipes are provided and are respectively connected to the side portions of the powder fluidization pipes;

[0041] And / or, the powder supply device includes a powder storage device, a powder feeding sliding valve, and a particle / powder replenishing device. The powder feeding sliding valve is arranged between the powder fluidization pipe and the powder storage device;

[0042] And / or, the particle and powder recovery device includes a particle recovery pipeline, a particle recovery valve, and a particle separator. The particle recovery pipeline is respectively connected to the gas-particle mixing pipe and the powder supply device. The particle recovery valve is arranged on the particle recovery pipeline. One end of the particle separator is connected to the side portion of the particle recovery pipeline, and the other end of the particle separator is connected to the side portion of the powder storage device.

[0043] In an alternative embodiment, the hot barrier coating environmental test assessment device further includes a test and measurement system, a data acquisition system, a test observation system, and a test control system. The test and measurement system is arranged on the test piece with the hot barrier coating. The test and measurement system and the temperature measurement device at the gun outlet feedback the detection information to the test control system through the data acquisition system. The test control system is used to transmit the test results to the test observation system for display.

[0044] In summary, the technical solution of the present invention has the following advantages:

[0045] 1. The multi-fuel spray gun provided by the present invention is a flame spray gun that can use multiple fuels simultaneously. The swirl mixer at the head of the flame spray gun is designed with two fuel channels to supply gaseous fuel and liquid fuel respectively, and the fuel swirler is used to improve the initial atomization effect of the fuel, ensuring that different types of fuels can achieve good arcs and combustion on the flame spray gun, realizing real-time switching of fuel types without affecting the coating assessment test. The present invention can use multiple fuels simultaneously to assess the environmental adaptability of the hot barrier coating, effectively avoiding the problems that the spray gun cannot reach the predetermined working conditions due to the large differences in viscosity and density of different fuels, and the need to update and reform the test system when switching fuels. In addition, through the improvement of the spray gun's own structure, the atomization effect of the fuel and the mixing effect with air can be effectively improved. When using air as the oxidant, good ignition and combustion of the spray gun can also be achieved, reducing the cost of test equipment, improving the combustion efficiency and test work efficiency to a certain extent.

[0046] 2. The swirl mixer at the head of the flame spray gun of the present invention uses a two-stage swirler to mix air and fuel. The two-stage swirler is adopted to enhance the swirl intensity of the air in the spray gun, and the air flow shear effect is formed by the different flow states of the primary air swirler and the secondary air swirler, effectively improving the mixing effect of fuel and air, and realizing that the spray gun can be quickly ignited and stably burned without using pure oxygen.

[0047] 3. The liquid fuel supply device of the present invention is arranged in the central area of the nozzle, and the gas fuel supply device is arranged on the periphery of the nozzle, that is, the gas fuel supply device is arranged on the periphery of the liquid fuel supply device. The diffusion ability of gaseous fuel is stronger than that of liquid fuel, and it can also have a good mixing effect with air when arranged on the periphery of the nozzle; the initial momentum of liquid fuel is large, and after being ejected from the central nozzle, it has good atomization effect and is easy to mix and burn through the aerodynamic action of the primary swirler in the air / particle swirler and the air flow shear action of the venturi tube.

[0048] 4. The cooling sleeve of the spray gun of the present invention is sleeved on the periphery of the combustion tube of the spray gun, and the spray gun is cooled by a circulating water flow with water inlet on one side and water outlet on the other side. By introducing water at the high-temperature side near the outlet and discharging water at the low-temperature side near the inlet, the cooling effect of the water flow passing through the spray gun is fully utilized to improve efficiency and reduce consumption.

[0049] 6. The gas fuel injection port of the present invention is designed in an angular injection form, and the rear end of the gas fuel injection port is set in an inclined form pointing to the venturi tube, so that the gas fuel ejected from the gas fuel injection port is sprayed towards the venturi tube, increasing the diffusion range of the fuel, promoting the mixing of the gas fuel and the high-pressure air, and improving the combustion efficiency.

[0050] 7. The environmental test assessment device for thermal barrier coatings of the present invention encloses the test equipment used in the environmental test assessment of thermal barrier coatings through the test chamber, improving the test safety and reducing risks; the reliable clamping and rapid replacement of different test equipment are improved through the porous test piece platform and the universal support; by controlling and recording the test process data of each subsystem, the key data during the test process can be monitored and recorded in real time, ensuring the accuracy and integrity of the test data, and providing data support for the subsequent analysis and evaluation of the performance of thermal barrier coatings.

[0051] 8. The erosion particle supply and mixing device of the present invention fluidizes the erosion particles used in the thermal barrier coating assessment test by using the high-pressure air originally used for the combustion of the spray gun, and promotes the mixing of the erosion particles and the high-pressure air by using a special bent powder fluidization tube, a multi-stage gas source outlet shunt tube, and a sudden expansion type gas-particle mixing tube; the powder supply and recovery are controlled by a powder feeding sliding valve and a particle recovery valve. Description of the Drawings

[0052] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0053] Figure 1 Schematic structural diagram of the environmental test assessment device for thermal barrier coatings provided by the present invention;

[0054] Figure 2 Schematic structural diagram of the multi-fuel spray gun provided by the present invention;

[0055] Figure 3 Schematic structural diagram of the erosion particle supply and mixing device provided by the present invention;

[0056] Figure 4 Schematic structural diagram of the swirl mixer provided by the present invention.

[0057] Explanation of reference numerals:

[0058] 1. Environmental assessment test chamber for thermal barrier coatings; 21. Inlet of the test chamber, 22. Exhaust port of the experimental chamber;

[0059] 31. Test platform;

[0060] 32. Multi-fuel spray gun, 321. Spray gun cooling sleeve, 322. Spray gun combustion tube, 323. Nozzle, 324. Swirl mixer, 325. Air / particle cyclone, 3251. Primary air cyclone, 3252. Secondary air cyclone, 3253. Venturi tube, 3254. Cyclone outlet sleeve, 326. Air / grain inlet pipe and joint of the spray gun, 327. Gas fuel inlet joint, 3271. Gas fuel inlet pressure stabilizing chamber, 3272. Gas fuel inlet shunt hole, 3273. Gas fuel cyclone, 3274. Gas fuel injection port, 328. Liquid fuel inlet joint, 3281. Liquid fuel inlet pressure stabilizing chamber, 3282. Liquid fuel shunt port, 3283. Liquid fuel cyclone, 3284. Liquid fuel injection port, 329. Spray gun igniter, 3210. Spray gun mounting flange, 3211. Air / liquid fuel nozzle, 3212. Nozzle mounting screw, 3213. Cooling sleeve water inlet joint, 3214. Cooling sleeve drain pipe joint;

[0061] 33. Universal bracket;

[0062] 34. Specimen with thermal barrier coating;

[0063] 35. High-pressure gas source, 351. Inlet pipe joint, 352. Gas source outlet gas collecting chamber, 353. Gas source outlet shunt pipe;

[0064] 36. Scouring particle supply and mixing device, 361. Powder fluidization pipe, 362. Gas-particle mixing pipe, 363. Powder storage device, 364. Erosion particle / powder, 365. Powder feeding sliding valve, 366. Particle / powder replenishment device, 367. Particle recovery valve, 368. Particle recovery pipe, 369. Particle separator;

[0065] 37. Gas fuel supply device;

[0066] 38. Liquid fuel supply device;

[0067] 41. Cooling water inlet pipe, 42. Cooling water drain pipe;

[0068] 5. Igniter power supply;

[0069] 6. Test observation system;

[0070] 7. Test measurement system, 71. Temperature measurement device at the gun outlet;

[0071] 8. Data acquisition system;

[0072] 9. Test control system. Detailed implementation manners

[0073] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0074] The prior art uses the flame formed by burning gas fuels such as propane and acetylene in a spray gun to complete the heat resistance assessment of the thermal barrier coating, or directly locally heats the thermal barrier coating using an electric heater, laser, etc. There are also some technologies that directly use a combustion chamber for the thermal shock test assessment of the thermal barrier coating and the combustion chamber, and some have adjusted the spray gun structure to simulate the real situation of the combustion chamber operation on an engine. However, generally speaking, there are also some problems, which are specifically as follows:

[0075] The Chinese invention patents with the publication number CN103063563A and the announcement number CN109696371B use gaseous fuel to match oxygen for combustion. The gaseous fuel itself does not have the chemical reaction characteristics of the commonly used kerosene in engines, and using oxygen also has certain differences from directly using air for combustion on engines. The Chinese invention patents with the publication numbers CN111879600A, CN116399602A, and CN117664763A use electric heating equipment to conduct thermal shock assessment on thermal barrier coatings, but there are certain differences from real flames. The Chinese invention patent with the publication number CN118882107A uses a multi-gun integrated design to simulate the operating conditions of the commonly used annular combustor in engines, and fails to solve the problem of environmental adaptability to thermal shock in different fuel environments. The Chinese invention patents with the publication numbers CN116046410A and CN116429436A propose to carry out thermal shock and thermal barrier coating environment tests in a real combustor, which requires preparing a large-flow high-temperature and high-pressure gas source, and the test takes a long time and the test pieces are complex, resulting in a high cost of test assessment.

[0076] Generally speaking, for the existing multi-fuel spray guns used in the thermal-mechanical coupling environment assessment test of aero-engine thermal barrier coatings, the fuel switching is difficult. There is no general spray gun for the mixed combustion of SAF fuel, hydrogen fuel, and diesel with air. In addition, there are problems such as uneven mixing of fuel and air and poor atomization effect of liquid fuel, resulting in low combustion efficiency and high consumption during the environmental test process.

[0077] Based on this, the present invention provides a swirl mixer, a multi-fuel spray gun, and a thermal barrier coating environment test assessment device, which can realize real-time fuel switching during the thermal barrier coating environment test, thereby accelerating the assessment test of the thermal barrier coating under the erosion of different fuel flames. By adding a liquid fuel swirl device and an air fuel swirl device in the flame spray gun, the initial atomization effect of the liquid fuel itself is improved, the uniform mixing of the fuel and the inlet air is promoted, the combustion efficiency is increased, and the test consumption is reduced.

[0078] According to an embodiment of the present invention, in the first aspect, a swirl mixer is provided, and its main functions include: improving the initial atomization effect of the liquid fuel through the swirl effect, increasing the probability of successful ignition and the combustion efficiency, so as to adapt to various fuels with different viscosities; promoting the pre-swirl of the fuel through the swirl, increasing the fuel diffusion range and realizing its pre-mixing with air, and improving the combustion reliability.

[0079] Combined with Figure 4 As shown, the swirl mixer includes a mixer housing, a gas / liquid fuel nozzle 3211, and an air / particle swirl device 325.

[0080] A cavity is arranged inside the mixer housing, and a spray gun gas / particle inlet pipe and a joint 326 communicating with the cavity are arranged on the mixer housing.

[0081] The gas / liquid fuel nozzle 3211 is disposed in the cavity of the mixer housing and is mounted on the mixer housing by nozzle mounting screws 3212. The gas / liquid fuel nozzle 3211 is inserted into the air / particle swirler 325. The gas / liquid fuel nozzle 3211 includes a gaseous fuel supply device and a liquid fuel supply device. The gaseous fuel supply device and the liquid fuel supply device are integrated together to form the gas / liquid fuel nozzle 3211.

[0082] The liquid fuel supply device includes a liquid fuel inlet joint 328, a liquid fuel inlet pressure stabilizing chamber 3281, and a liquid fuel injection port 3284 which are arranged in communication from the front end to the rear end. A liquid fuel swirler 3283 is disposed in the liquid fuel injection port 3284. The gaseous fuel supply device includes a gaseous fuel inlet joint 327, a gaseous fuel inlet pressure stabilizing chamber 3271, and a gaseous fuel injection port 3274 which are arranged in communication from the front end to the rear end. A gaseous fuel swirler 3273 is disposed in the gaseous fuel injection port 3274. Both the gaseous fuel supply device and the liquid fuel supply device are designed with a collection pressure stabilizing chamber, a diversion port, a pre-swirl device, and an injection port. By means of fuel pre-swirl, the initial centrifugal atomization effect of the liquid fuel and the mixing effect of the gaseous and liquid fuels with air are improved.

[0083] The air / particle swirler 325 is an air swirling and fuel-air mixing device. The air / particle swirler 325 is disposed in the cavity of the mixer housing and is located outside the gaseous fuel injection port 3274. The air / particle swirler 325 is used to swirl and mix the air or particles entering the cavity of the mixer housing, and mix the mixed air or particles with the gaseous fuel and the liquid fuel.

[0084] In this embodiment, the swirl mixer at the head of the flame spray gun is designed with two fuel channels to supply gaseous fuel and liquid fuel respectively. The liquid fuel swirler 3283 is used to pre-swirl the liquid fuel, and the gaseous fuel swirler 3273 is used to pre-swirl the gaseous fuel, so as to improve the initial atomization effect of the fuel, ensure that better arcs and combustion can be achieved for different types of fuels on the flame spray gun, realize real-time switching of fuel types without affecting the coating evaluation test, and thus the flame spray gun can use multiple fuels simultaneously.

[0085] In some embodiments, in the gas / liquid fuel nozzle 3211, the liquid fuel supply device is disposed in the central region of the nozzle, and the gas fuel supply device is arranged on the periphery of the nozzle, that is, the gas fuel supply device is disposed on the periphery of the liquid fuel supply device. The diffusion ability of gaseous fuel is stronger than that of liquid fuel, and when arranged on the periphery of the nozzle, it can also have a better mixing effect with air; the initial momentum of liquid fuel is large. After being ejected from the central nozzle, it undergoes the aerodynamic action of the primary cyclone in the air / particle cyclone 325 and the air flow shearing action of the venturi tube, resulting in good atomization effect and easy mixing and combustion.

[0086] As an alternative embodiment, the gas fuel supply device is disposed in the central region of the nozzle, and the liquid fuel supply device is disposed on the periphery of the gas fuel supply device. At this time, the gas fuel first undergoes premixing with air, and then further mixing and atomization are carried out through the liquid fuel ejected from the peripheral liquid fuel supply device. This design can adjust the order of fuel mixing according to specific application requirements to adapt to different combustion conditions or test requirements.

[0087] In both embodiments, the mixing of gas fuel and liquid fuel is carried out through the air / particle cyclone 325, ensuring sufficient mixing and atomization of the fuel, thereby improving the combustion efficiency and stability of the flame spray gun.

[0088] In some embodiments, a first partition is provided between the liquid fuel inlet pressure stabilizing chamber 3281 and the liquid fuel injection port 3284, and a liquid fuel diversion port 3282 for communicating the liquid fuel inlet pressure stabilizing chamber 3281 and the liquid fuel injection port 3284 is provided on the first partition.

[0089] A second partition is provided between the gas fuel inlet pressure stabilizing chamber 3271 and the gas fuel injection port 3274, and a gas fuel inlet diversion hole 3272 for communicating the gas fuel inlet pressure stabilizing chamber 3271 and the gas fuel injection port 3274 is provided on the second partition.

[0090] In some embodiments, the air / particle cyclone 325 includes a primary air cyclone 3251, a secondary air cyclone 3252, a venturi tube 3253, and a cyclone outlet sleeve 3254. The primary air cyclone 3251 is disposed inside the venturi tube 3253. There is a ventilation passage between the venturi tube 3253 and the cyclone outlet sleeve 3254. The secondary air cyclone 3252 is disposed in the ventilation passage. The cyclone outlet sleeve 3254 is connected to the mixer housing. Designing the structure of the cyclone outlet sleeve 3254 at the air swirl mixer outlet can control the swirl outlet angle, thereby controlling the combustion effect and flame shape in the spray gun combustion tube 322 to achieve the purpose of meeting the expected flame generation for coating assessment. The gas fuel injection port 3274 and the liquid fuel injection port 3284 of the gas / liquid fuel nozzle 3211 are inserted into the interior of the venturi tube 3253.

[0091] In this embodiment, a two-stage air cyclone is adopted, which can effectively improve the intensity of swirl mixing. And through the air pre-swirl and the venturi tube design in the fuel mixer, after the liquid fuel is ejected from the liquid fuel injection port 3284, it can flow along the inner surface of the venturi tube, and under the mutual shearing action of the two layers of airflows of the primary air cyclone 3251 and the secondary air cyclone 3252, it is further atomized, broken, and mixed with the air in the cyclone to improve the combustion effect.

[0092] In some embodiments, the inner diameters of the venturi tube 3253 and the cyclone outlet sleeve 3254 gradually decrease from the front end to the rear end. The gas fuel injection port 3274 is designed in an angular injection form, spraying at a certain angle to the nozzle center line towards the venturi tube 3253. The rear end of the gas fuel injection port 3274 is set in an inclined form pointing to the venturi tube 3253, so that the gas fuel ejected from the gas fuel injection port 3274 sprays towards the venturi tube 3253, increasing the diffusion range of the fuel and strengthening the mixing and subsequent combustion effect.

[0093] The liquid fuel injection port 3284 is set in a contraction-expansion form from the front end to the rear end to utilize the centrifugal force generated by the swirl of the liquid fuel cyclone 3283 to form a centrifugal atomization effect and improve the mixing and combustion performance.

[0094] The air / particle cyclone 325 is generally designed in a contraction-expansion form from the front end to the rear end. On the one hand, it accelerates the air flow, promotes the atomization of the liquid fuel and the mixing of the fuel and air; on the other hand, it fully expands and sends the pre-mixed and uniform fuel into the spray gun combustion tube to achieve the uniform distribution of the fuel and the uniformity of combustion.

[0095] In the above-mentioned cyclone mixer, during the actual test, according to the different types of fuels used in the engine, the corresponding gaseous or liquid fuel is selected, and one of the fuel nozzles is used for supply. The flow rate, ratio relationship, initial temperature, etc. of the fuel and air are determined in combination with the specific operating state of the engine to achieve the most realistic assessment of the thermal barrier coating.

[0096] According to an embodiment of the present invention, in a second aspect, a multi-fuel spray gun is provided, which is a flame spray gun applicable to multiple fuels. Figure 2 As shown, it includes a spray gun combustion tube 322, a cyclone mixer 324, a nozzle 323 and a cooling structure. A spray gun igniter 329 is provided on the spray gun combustion tube 322. The cyclone mixer 324 is arranged at the front end of the spray gun combustion tube 322, and the outlet of the air / particle cyclone 325 in the cyclone mixer 324 is communicated with the spray gun combustion tube 322. The nozzle 323 is communicatively arranged at the rear end of the spray gun combustion tube 322. After the fuel completes the designed combustion effect in the spray gun combustion tube 322, it is ejected through the spray gun nozzle 323 to provide a heat source for the assessment of the thermal barrier coating specimen. To extend the service life of the spray gun, the cooling structure is arranged around the spray gun combustion tube 322 to cool down the spray gun combustion tube 322 through the cooling structure.

[0097] In some embodiments, the spray gun combustion tube 322 is designed to be cylindrical, and the degree of completion of the combustion reaction can be controlled by adjusting the length, so as to consider the influence of the intermediate products of the chemical reaction on the thermal barrier coating. In addition, the structure of the multi-fuel spray gun 32 can be in various forms such as square and rectangular in addition to the circular tube type.

[0098] In some embodiments, the nozzle 323 is in the shape of a converging-diverging Laval nozzle from the front end to the rear end. When assessing the thermal barrier coating of the turbine guide vane, supersonic flame injection can be achieved, thereby increasing the temperature and pressure of the flame, subjecting the thermal barrier coating to a more severe assessment to simulate extreme conditions in the real working environment. At the same time, the design of the Laval nozzle shape can also optimize the injection angle and injection distance of the flame, ensuring that the flame can accurately cover the assessment area of the thermal barrier coating and improving the accuracy and reliability of the assessment.

[0099] In some embodiments, a spray gun outlet temperature measuring device 71 is arranged at the outlet position of the nozzle 323, which can be used to measure the flame temperature at the spray gun outlet and feedback control the supply of fuel and air to ensure the stability and accuracy of the flame temperature. The spray gun outlet temperature measuring device 71 can be a thermocouple probe. The design of the thermocouple probe enables it to quickly respond to changes in the flame temperature and convert these changes into electrical signals, and the supply of fuel and air is adjusted in real time through the control system, which helps to optimize the combustion process and improve the performance and efficiency of the thermal barrier coating environmental test assessment device.

[0100] In some embodiments, the cooling structure includes a spray gun cooling sleeve 321, a cooling sleeve water inlet joint 3213, and a cooling sleeve drain joint 3214. The spray gun cooling sleeve 321 is sleeved around the outer periphery of the spray gun combustion tube 322. The spray gun cooling sleeve 321 is installed on the installation flange of the spray gun combustion tube 322 through a spray gun installation flange 3210, and the two are fastened by screws. A cooling water storage gap is formed between the inner wall of the spray gun cooling sleeve 321 and the outer wall of the spray gun combustion tube 322. Both the cooling sleeve water inlet joint 3213 and the cooling sleeve drain joint 3214 communicate with the cooling water storage gap. When using the spray gun cooling sleeve 321 for cooling, the cooling water flows in near the spray gun outlet position and flows out from the spray gun inlet position, that is, the flow direction of the cooling water is opposite to the spraying direction of the flame, which can effectively utilize the high temperature of the cooling water source at the inlet to cool the high temperature section of the spray gun combustion tube 322 and improve the cooling efficiency. The cooling sleeve water inlet joint 3213 and the cooling sleeve drain joint 3214 are respectively arranged on the left and right / upper and lower sides of the spray gun, which can make the cooling water flow around the spray gun for one week, improve the cooling efficiency, and reduce the consumption of the cooling water.

[0101] As an alternative embodiment, in the cooling structure, in addition to cooling water, other media can also be used as the cooling medium.

[0102] The specific working process of the above multi-fuel spray gun is as follows:

[0103] After high-pressure air or an air-particle mixture mixed with scouring particles is sprayed into from the spray gun air / particle inlet pipe and joint 326, it is first stabilized in the swirl mixer 324 at the head of the spray gun to achieve uniform inlet pressure, and then enters the air / particle cyclone 325 channel. Under the action of the air / particle cyclone, the air-particle mixture rotates. The centrifugal action of the rotation makes there be a low-pressure area in the central area of the spray gun, and the air flow stays in this area, which is beneficial to ignition and flame stability. An air / liquid fuel nozzle 3211 is installed on the swirl mixer 324 at the head of the spray gun. The air / liquid fuel nozzle 3211 can simultaneously introduce gaseous fuel or liquid fuel, which are supplied through two fuel nozzles respectively. After the fuel is sprayed into in a gaseous or liquid state from the air / liquid fuel nozzle, it mixes with the air entering from the air / particle cyclone 325 to form a pre-mixed fuel-air mixture, which is sprayed into the combustion pipeline of the spray gun and is ignited under the action of the ignition source of the spray gun igniter 329, and then combustion is completed in the spray gun combustion tube 322. The centrifugal action of the cyclone can greatly increase the ignition success probability of the air-fuel mixture, avoid using expensive and highly dangerous strong oxidants such as pure oxygen, and enable the test to simulate the real flame effect even when using low-cost equipment such as an air compressor.

[0104] According to an embodiment of the present invention, in the third aspect, a thermal barrier coating environmental test assessment device is provided, in combination with Figure 1As shown, it includes a hot barrier coating environmental assessment test chamber 1, an air circulation system, a test platform 31, a test piece 34 with a hot barrier coating, and a multi-fuel spray gun 32.

[0105] The hot barrier coating environmental assessment test chamber 1 is mainly used to contain high-temperature, exhaust gas and other pollutants generated during the hot barrier coating environmental assessment test, and to prevent test personnel from being harmed during the test.

[0106] The air circulation system is arranged on the hot barrier coating environmental assessment test chamber 1 and is used to exchange the air inside the hot barrier coating environmental assessment test chamber 1 with the outside air, remove the exhaust gas, pollutants, etc. generated during the hot barrier coating environmental assessment test, and ensure the safe operation of the test device and the test system. The air circulation system mainly includes a test chamber air inlet 21, a test chamber exhaust outlet 22 and a circulation fan. At least one test chamber air inlet 21 and one test chamber exhaust outlet 22 are respectively arranged. The test chamber air inlet 21 and the test chamber exhaust outlet 22 are arranged on the opposite side walls of the hot barrier coating environmental assessment test chamber 1, and both are communicated with the inside of the hot barrier coating environmental assessment test chamber 1.

[0107] The test platform 31 is arranged inside the hot barrier coating environmental assessment test chamber 1, and the top of the test platform 31 can place the test piece 34 with a hot barrier coating and the multi-fuel spray gun 32.

[0108] The test piece 34 with a hot barrier coating is arranged on the test platform 31 through a universal support 33.

[0109] At least one multi-fuel spray gun 32 is arranged on the test platform 31. The output port of the multi-fuel spray gun 32 is directly opposite to the test piece 34 with a hot barrier coating. The multi-fuel spray gun 32 is externally connected to a multi-fuel spray gun high-pressure gas source 35, a gaseous fuel supply device 37, a liquid fuel supply device 38, a cooling medium supply device and an igniter power supply 5.

[0110] According to the size of the test piece 34 with a hot barrier coating and the working environment requirements, one or more multi-fuel spray guns 32 can be used for the test. Therefore, the hot barrier coating environmental assessment test chamber 1 can also be adjusted according to the actual test requirements. During the test, the test personnel pre-place the test piece 34 with a hot barrier coating and carry out relevant test preparation work, and then leave the hot barrier coating environmental assessment test chamber to conduct the test.

[0111] In some embodiments, the test platform 31 is designed as a porous platform. A plurality of positioning holes are provided at the top of the test platform 31. The universal bracket 33 is adapted to the positioning holes, facilitating the timely and convenient replacement of the test piece 34 with a thermal barrier coating, and also facilitating the clamping and support of the bracket, preventing the test piece from being damaged by the high-speed air flow of the flame spray gun. The multi-fuel spray gun 32 is arranged on the test platform 31 through a positioning bracket, and the positioning bracket is adapted to the positioning holes. The universal bracket 33 is designed in cooperation with the test platform 31 and can be used for test piece clamping, observation device installation, testing device installation, spray gun clamping, etc. By machining a batch of brackets with unified dimensions, the convenience is improved and the cost is reduced.

[0112] The thermal barrier coating environmental test assessment device further includes a test and measurement system 7, a data acquisition system 8, a test observation system 6, and a test control system 9. The test and measurement system 7 is arranged on the test piece 34 with a thermal barrier coating. The test and measurement system 7 and the temperature measurement device 71 at the spray gun outlet feedback the detection information to the test control system 9 through the data acquisition system 8, and the test control system 9 is used to transmit the test results to the test observation system 6 for display.

[0113] In some embodiments, the multi-fuel spray gun 32 is further connected with a scouring particle supply and mixing device 36. The scouring particle supply and mixing device 36 has an open state when considering the influence of external particles on the thermal barrier coating and a closed state when not considering the influence of external particles on the thermal barrier coating.

[0114] Combined with Figure 3 As shown, the scouring particle supply and mixing device 36 includes a high-pressure gas source shunt device, a powder fluidization tube 361, a gas-particle mixing tube 362, a spray gun gas / particle inlet tube and joint 326, a powder supply device, and a particle powder recovery device. The air outlet end of the high-pressure gas source shunt device is communicated with the powder fluidization tube 361. The powder fluidization tube 361 is set in a bent shape and the middle position is lower than the positions at both ends. One end of the powder fluidization tube 361 is connected to the powder supply device, and the other end of the powder fluidization tube 361 is connected to the gas-particle mixing tube 362. The side of the gas-particle mixing tube 362 is connected to the spray gun gas / particle inlet tube and joint 326. The particle powder recovery device has a feed inlet and a discharge outlet. The feed inlet of the particle powder recovery device is connected to the gas-particle mixing tube 362, and the discharge outlet of the particle powder recovery device is connected to the powder supply device.

[0115] The high-pressure gas source shunt device includes an inlet pipe joint 351, a gas source outlet gas collection cavity 352, and a gas source outlet shunt pipe 353. The inlet pipe joint 351 is connected to the high-pressure gas source outlet. One end of the gas source outlet gas collection cavity 352 is connected to the inlet pipe joint 351, and the other end of the gas source outlet gas collection cavity 352 is connected to the gas source outlet shunt pipe 353. A plurality of gas source outlet shunt pipes 353 are provided and are respectively connected to the side of the powder fluidization tube 361.

[0116] The powder supply device includes a powder storage device 363, a powder feeding sliding valve 365, and a particle / powder replenishing device 366. The powder feeding sliding valve 365 is arranged between the powder fluidization pipe 361 and the powder storage device 363. The powder storage device 363 contains erosion particles / powders 364.

[0117] The particle and powder recovery device includes a particle recovery pipe 368, a particle recovery valve 367, and a particle separator 369. The particle recovery pipe 368 is respectively connected to the gas-particle mixing pipe 362 and the powder supply device. The particle recovery valve 367 is arranged on the particle recovery pipe 368. One end of the particle separator 369 is connected to the side of the particle recovery pipe 368, and the other end of the particle separator 369 is connected to the side of the powder storage device 363. The particle separator 369 is used to separate particles from gas and re-transport the separated particles to the powder storage device 363.

[0118] When the particle erosion effect does not need to be considered in the hot barrier coating qualification test, the powder feeding sliding valve 365 and the particle recovery valve 367 are closed. High-pressure air flows out from the intake pipe joint 351 and enters the gas source outlet air collection chamber 352. After passing through the gas source outlet shunt pipe 353, the powder fluidization pipe 361, and the gas-particle mixing pipe 362, it flows out through the spray gun gas / particle inlet pipe and joint 326. At this time, pure air flows in the powder fluidization pipe 361 and the gas-particle mixing pipe 362, and there is no gas-particle mixing process.

[0119] When the particle erosion effect needs to be considered in the hot barrier coating qualification test, the powder feeding sliding valve 365 and the particle recovery valve 367 are both opened. The opening degrees of the two valves are controlled to control the mixture particle concentration, so as to control the impact degree of the erosion particles. At this time, the high-pressure air disperses the dense erosion particles in the powder fluidization pipe 361 and the gas-particle mixing pipe 362, making them evenly distributed in the air flow, and then enters the spray gun to be mixed and burned with the fuel. The combustion process heats the erosion particles to form molten particles, which can simulate the damage effect of sand ingestion and foreign object ingestion on the coating during the actual operation of the engine.

[0120] In the above-mentioned hot barrier coating environmental test qualification device, the multi-fuel spray gun 32 can use a variety of different gaseous and liquid fuels and use high-pressure air as an oxidant, and can simulate the actual flame erosion situation of the hot barrier coating on the engine. The specific working process is as follows:

[0121] After high-pressure air enters from the high-pressure gas source 35, it enters the flame spray gun after passing through the scouring particle supply and mixing device 36. In the conventional thermal shock test, the scouring particle supply and mixing device 36 is in a closed state, without mixing air and scouring particles; when considering the influence of thermal barrier coatings by sand dust, volcanic ash, solid fuel particles, etc., the scouring particle supply and mixing device 36 is opened, and an appropriate amount of particles is mixed into the high-pressure air, flowing and changing with the flame in the flame spray gun and spraying onto the thermal barrier coating. The multi-fuel spray gun 32 has an air inlet and two fuel inlets. The fuel inlets are respectively a gas fuel inlet and a liquid fuel inlet. The gas fuel inlet is connected to the gas fuel supply device 37, and the liquid fuel inlet is connected to the liquid fuel supply device 38. The gas fuel is not limited to propane, acetylene, natural gas, hydrogen, and the liquid fuel is not limited to kerosene, diesel, and SAF fuel. In order to reduce the problems during the combustion process of the flame spray gun, cooling water is used to cool the surface of the spray gun. The cooling water inlet pipe 41 and the cooling water drain pipe 42 are respectively connected to the water flow system outside the test device.

[0122] During the test, the test control system 9 is used to control the high-pressure gas source 35 to supply fresh air to the spray gun, the fuel supply system to supply fuel to the spray gun, the igniter power supply 5 to ignite the spray gun, and the test observation system 6, the test measurement system 7, and the data acquisition system 8 are opened to measure and record various parameters during the assessment process of the thermal barrier coating. According to the test results, the tolerance of the thermal barrier coating on a specific test piece when being scoured by the flame is analyzed, so as to predict the working performance of the thermal barrier coating before actual use.

[0123] The present invention has been proven by simulation that the atomization effect of the liquid fuel injection device with swirl is better than that of the fuel supply device of the spray gun without a swirl device. In addition, the mixing effect of the fuel supplied by the spray gun and the air is better, and the combustion efficiency is high.

[0124] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A swirl mixer, characterized in that, Comprising: A mixer housing with a cavity inside, and a spray gun gas / particle inlet pipe and a joint (326) communicating with the cavity are provided on the mixer housing; A gas / liquid fuel nozzle (3211) is disposed in the cavity of the mixer housing and connected to the mixer housing. The gas / liquid fuel nozzle (3211) includes a gas fuel supply device and a liquid fuel supply device. The liquid fuel supply device includes a liquid fuel inlet joint (328), a liquid fuel inlet pressure stabilizing cavity (3281), and a liquid fuel injection port (3284) arranged in communication in sequence from the front end to the rear end. A liquid fuel swirler (3283) is provided in the liquid fuel injection port (3284). The gas fuel supply device includes a gas fuel inlet joint (327), a gas fuel inlet pressure stabilizing cavity (3271), and a gas fuel injection port (3274) arranged in communication in sequence from the front end to the rear end. A gas fuel swirler (3273) is provided in the gas fuel injection port (3274); An air / particle swirler (325) is disposed in the cavity of the mixer housing and is located outside the gas fuel injection port (3274). The air / particle swirler (325) is used to swirl and mix the air or particles entering the cavity of the mixer housing, and mix the mixed air or particles with the gas fuel and the liquid fuel.

2. The swirl mixer according to claim 1, wherein The liquid fuel supply device is arranged in the central area of the nozzle, and the gas fuel supply device is arranged outside the liquid fuel supply device; Or, the gas fuel supply device is arranged in the central area of the nozzle, and the liquid fuel supply device is arranged outside the gas fuel supply device.

3. The swirl mixer according to claim 1, wherein, A first partition is provided between the liquid fuel inlet pressure stabilizing cavity (3281) and the liquid fuel injection port (3284), and a liquid fuel shunt port (3282) for communicating the liquid fuel inlet pressure stabilizing cavity (3281) with the liquid fuel injection port (3284) is provided on the first partition; And / or, a second partition is provided between the gas fuel inlet pressure stabilizing cavity (3271) and the gas fuel injection port (3274), and a gas fuel inlet shunt hole (3272) for communicating the gas fuel inlet pressure stabilizing cavity (3271) with the gas fuel injection port (3274) is provided on the second partition.

4. The swirl mixer according to claim 1, characterized in that, The air / particle swirler (325) includes a primary air swirler (3251), a secondary air swirler (3252), a venturi tube (3253), and a swirler outlet sleeve (3254). The primary air swirler (3251) is disposed inside the venturi tube (3253). There is a ventilation passage between the venturi tube (3253) and the swirler outlet sleeve (3254). The secondary air swirler (3252) is disposed in the ventilation passage. The swirler outlet sleeve (3254) is connected to the mixer housing. The gas fuel injection port (3274) and the liquid fuel injection port (3284) of the gas / liquid fuel nozzle (3211) are inserted into the interior of the venturi tube (3253).

5. The swirl mixer according to claim 4, characterized in that, The inner diameters of the venturi tube (3253) and the cyclone outlet sleeve (3254) gradually decrease from the front end to the back end; The rear end of the gas fuel injection port (3274) is set in an inclined form pointing to the venturi tube (3253), so that the gas fuel ejected from the gas fuel injection port (3274) is sprayed towards the venturi tube (3253).

6. The swirl mixer according to any one of claims 1-5, characterized in that, The liquid fuel injection port (3284) is set in a convergent-divergent form from the front end to the back end; And / or, the air / particle cyclone (325) is set in a convergent-divergent form from the front end to the back end.

7. Multi-fuel spray gun, characterized in that, Comprising: A spray gun combustion tube (322) provided with a spray gun igniter (329) thereon; The swirl mixer (324) according to any one of claims 1-6, arranged at the front end of the spray gun combustion tube (322), and the output port of the air / particle cyclone (325) in the swirl mixer (324) is communicated with the spray gun combustion tube (322); A nozzle (323) communicatively arranged at the rear end of the spray gun combustion tube (322); A cooling structure arranged on the periphery of the spray gun combustion tube (322).

8. The multi-fuel spray gun according to claim 7, wherein, The nozzle (323) is in the shape of a convergent-divergent Laval nozzle from the front end to the back end; And / or, a spray gun outlet temperature measuring device (71) is arranged at the outlet position of the nozzle (323); And / or, the cooling structure includes a spray gun cooling sleeve (321) sleeved on the periphery of the spray gun combustion tube (322), and the flow direction of the cooling medium introduced into the spray gun cooling sleeve (321) is opposite to the spraying direction of the flame of the spray gun combustion tube (322).

9. Thermal barrier coating environmental test assessment device, characterized in that Comprising: A hot barrier coating environmental assessment test chamber (1); An air circulation system arranged on the hot barrier coating environmental assessment test chamber (1) for exchanging the air inside the hot barrier coating environmental assessment test chamber (1) with the outside air; A test platform (31) arranged inside the hot barrier coating environmental assessment test chamber (1); A test piece (34) with a hot barrier coating, arranged on the test platform (31) through a universal bracket (33); At least one multi-fuel spray gun (32) according to claim 7 or 8, arranged on the test platform (31), the output port of the multi-fuel spray gun (32) is directly opposite to the test piece (34) with a hot barrier coating, and the multi-fuel spray gun high-pressure gas source (35), gas fuel supply device (37), liquid fuel supply device (38), cooling medium supply device and igniter power supply (5) externally connected to the multi-fuel spray gun (32).

10. The environmental test assessment device for thermal barrier coatings according to claim 9, wherein A plurality of positioning holes are arranged at the top end of the test platform (31), and the universal bracket (33) is adapted to the positioning holes; the multi-fuel spray gun (32) is arranged on the test platform (31) through a positioning bracket, and the positioning bracket is adapted to the positioning holes.

11. The hot barrier coating environmental test assessment device according to claim 9, wherein, The multi-fuel spray gun (32) is further connected with a scouring particle supply and mixing device (36); the scouring particle supply and mixing device (36) has an open state when considering the influence of external particles on the hot barrier coating and a closed state when not considering the influence of external particles on the hot barrier coating; The erosion particle supply and mixing device (36) includes a high-pressure gas source shunt device, a powder fluidization pipe (361), a gas-solid mixing pipe (362), a spray gun gas / solid inlet pipe and joint (326), a powder supply device, and a particle and powder recovery device; The outlet end of the high-pressure gas source shunt device is communicated with the powder fluidization pipe (361); The powder fluidization pipe (361) is arranged in a bent shape with the middle position lower than the two ends. One end of the powder fluidization pipe (361) is connected to the powder supply device, and the other end of the powder fluidization pipe (361) is connected to the gas-solid mixing pipe (362); The side of the gas-solid mixing pipe (362) is connected to the spray gun gas / solid inlet pipe and joint (326); The particle and powder recovery device has a feed inlet and a discharge outlet. The feed inlet of the particle and powder recovery device is connected to the gas-solid mixing pipe (362), and the discharge outlet of the particle and powder recovery device is connected to the powder supply device.

12. The thermal barrier coating environmental test assessment device according to claim 11, characterized in that, The high-pressure gas source shunt device includes an inlet pipe joint (351), a gas source outlet gas collection chamber (352), and a gas source outlet shunt pipe (353). The inlet pipe joint (351) is connected to the high-pressure gas source outlet. One end of the gas source outlet gas collection chamber (352) is connected to the inlet pipe joint (351), and the other end of the gas source outlet gas collection chamber (352) is connected to the gas source outlet shunt pipe (353). A plurality of gas source outlet shunt pipes (353) are provided and are respectively connected to the side of the powder fluidization pipe (361); And / or, the powder supply device includes a powder storage device (363), a powder feeding sliding valve (365), and a particle / powder replenishment device (366). The powder feeding sliding valve (365) is arranged between the powder fluidization pipe (361) and the powder storage device (363); And / or, the particle and powder recovery device includes a particle recovery pipeline (368), a particle recovery valve (367), and a particle separator (369). The particle recovery pipeline (368) is respectively connected to the gas-solid mixing pipe (362) and the powder supply device. The particle recovery valve (367) is arranged on the particle recovery pipeline (368). One end of the particle separator (369) is connected to the side of the particle recovery pipeline (368), and the other end of the particle separator (369) is connected to the side of the powder storage device (363).

13. The hot barrier coating environmental test assessment device according to any one of claims 9-12, characterized in that, The thermal barrier coating environmental test assessment device further includes a test and measurement system (7), a data acquisition system (8), a test observation system (6), and a test control system (9). The test and measurement system (7) is arranged on the test piece (34) with a thermal barrier coating. The test and measurement system (7) and the spray gun outlet temperature measurement device (71) feedback the detection information to the test control system (9) through the data acquisition system (8). The test control system (9) is used to transmit the test results to the test observation system (6) for display.

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