A system and method for studying radiation characteristics of engine environmental thermal resistance coating

Abstract

The present invention discloses a system and method for studying the radiation characteristics of thermal resistance coatings in an engine environment. The system includes a wind tunnel, a Fourier spectrometer, an infrared thermal imager, and an infrared ellipsometer. The system uses a Fourier spectrometer to measure the infrared spectrum characteristics of high-temperature media, an infrared thermal imager to measure the surface temperature of the coating and the substrate structure, and an infrared ellipsometer to measure the surface absorptivity and emissivity of the coating. The system can quantitatively obtain the transient and steady-state transfer relationship and evolution law between medium radiation and coating heat energy and radiation energy under wind tunnel simulation of a real engine thermal cycle, quantitatively obtain the transient and steady-state transfer relationship and evolution law between medium radiation coating heat energy and radiation energy, and quantitatively evaluate the transient and steady-state thermal radiation barrier rate and thermal insulation effect of the thermal resistance coating.

Description

Technical Field

[0001] The present invention belongs to the technical field of thermal environment test research, and specifically relates to a system and method for studying the radiation characteristics of an engine environment thermal resistance coating under multi-field coupling under wind tunnel simulation of a real engine thermal cycle. Background Art

[0002] In order to test the barrier effect of various thermal insulation technologies on high temperature environments, a large number of thermal environment test studies have been carried out at home and abroad: In the 1960s, structural thermal test laboratories at home and abroad all used thermal test systems with quartz lamp radiation heating as the heat source. The total power of such test systems generally ranges from a few kilowatts to hundreds of thousands of kilowatts; in the 1970s, researchers began to develop graphite heaters. Graphite is processed into heating elements according to the shape of the test object, and the test object is heated by the radiation heat of the graphite heating element, forming a new radiation heating test system with graphite as the heating element, raising the temperature of the test object to 1200℃~1600℃, and the heating rate is also improved. The most typical test is the thermal structure test of the leading edge and nose cone of the space shuttle; while developing graphite heaters, convection heating test systems with high temperature and high pressure gas as the heat source are also studied, such as the TPSTF (thermal protection system test device) and HTST (8-foot high temperature structure wind tunnel) in the United States. This type of test system uses the chemical reaction of high pressure gas and fuel to generate high temperature, high pressure, and high speed airflow to heat the surface of the test object, and evaluate the heat release capacity of the protective thermal structure and the heat bearing capacity of the thermal structure. At present, the heating equipment for creating high temperature environment mainly includes three categories: solar furnace, arc lamp, quartz lamp and graphite heating element. Among them, graphite heater is often used in the test of heat transfer performance of thermal protection structure due to its advantages such as high heating temperature, uniform temperature zone and long operation time. However, the temperature rise rate of commonly used heating devices is very low (<5℃), and the existing test equipment is mostly used to characterize the steady-state thermal radiation characteristics of protective materials in high temperature environment.

[0003] The actual engine temperature rise rate can reach 100°C. With extreme temperature changes, the thermal stress on the material will also change rapidly, which can easily lead to problems such as thermal expansion and thermal deformation. The expansion and deformation of the material will have an adverse effect on the mechanical properties and thermal insulation protection of the surface coating, and may even induce coating failure. Therefore, it is crucial to explore the transient and steady-state thermal characteristics of the thermal resistance coating during the rapid temperature rise process.

[0004] Therefore, it is necessary to develop a multi-field coupled system and method for studying the radiation characteristics of engine environmental thermal resistance coatings under wind tunnel simulation of the actual engine thermal cycle. Summary of the invention

[0005] In view of the problems existing in the prior art, the purpose of the present invention is to provide a system and method for studying the radiation characteristics of engine environmental thermal resistance coatings, which can realize the wind tunnel simulation of the real engine thermal cycle, quantitatively obtain the transient and steady-state transfer relationship and evolution law between the medium radiation and the coating thermal energy and radiation energy, and quantitatively evaluate the transient and steady-state thermal radiation barrier rate and thermal insulation effect of the thermal resistance coating.

[0006] The technical solution adopted by the present invention is:

[0007] A system for studying the radiation characteristics of an engine environment thermal resistance coating includes a wind tunnel, a Fourier spectrometer, an infrared thermal imager, and an infrared ellipsometer, so as to quantitatively obtain the transient and steady-state transfer relationship and evolution law between medium radiation and coating thermal energy and radiation energy under wind tunnel simulation of a real engine thermal cycle, and quantitatively evaluate the transient and steady-state thermal radiation barrier rate and thermal insulation effect of the thermal resistance coating.

[0008] The wind tunnel is provided with a substrate coated with a coating, that is, a thermal resistance coating is applied on an engine turbine blade to examine the ability of the substrate to withstand a large heat flux density (e.g., 10 0 ~10 1 MW / m 2 ), the thermal insulation effect of thermal resistance coating on the substrate (i.e. engine turbine blade) under high temperature (such as 1400℃) and high temperature rise rate (such as 100℃ / s) environment.

[0009] The Fourier spectrometer is horizontally placed on one side of the wind tunnel, the infrared thermal imager is horizontally placed on the other side of the wind tunnel, the incident light system and the receiving detection light system of the infrared ellipsometer are symmetrically arranged on both sides of the wind tunnel, and the light of the infrared ellipsometer is irradiated on the coating (2).

[0010] Furthermore, the wind tunnel is set as a supersonic wind tunnel, and the temperature rise rate of the test section of the wind tunnel reaches 100°C / s. 0 ~10 1 MW / m 2 ), high temperature (such as 1400℃), high temperature rise rate (such as 10 2 ℃ / s) environment.

[0011] Wind tunnel simulation of real engine thermal cycle and multi-field coupled thermal radiation measurement;

[0012] The wind tunnel simulates the actual engine thermal cycle and uses a supersonic wind tunnel to reproduce the typical thermal cycle and temperature environment inside the engine, which is used to study and characterize the transient and steady-state thermal radiation characteristics of protective materials in high-temperature environments and quantify the actual thermal radiation barrier capacity and thermal insulation effect;

[0013] The multi-field coupled thermal radiation measurement adopts Fourier spectroscopy measurement method to measure the infrared spectral characteristics of high-temperature media, infrared thermal imaging measurement method to measure the surface temperature of coating and substrate structure, and infrared ellipsometry measurement method to measure the surface absorptivity and emissivity of coating.

[0014] Furthermore, the infrared ellipsometer is based on the polarization light method for measurement, including an incident light system and a receiving detection light system. The incident light system is sequentially provided with a light source, a polarizer, and a compensator, and the receiving detection light system is sequentially provided with a detection light system and an analyzer. When the light source incidents polarized light onto the interface between the coating and the substrate through the polarizer and the compensator, reflection and refraction phenomena will occur. The reflected light and the refracted light respectively contain the target characteristics of the substrate and the coating. The intensity of each component in the reflected light and the refracted light is described by Snell's law and Fresnel's formula. The reflected light and the refracted light are received by the analyzer and the detection light system, and the refractive index and absorptivity of the substrate and the thermal resistance coating are obtained by solution, thereby inverting the emissivity and transmittance of the thermal resistance coating and obtaining the emission spectrum of the thermal resistance coating.

[0015] Furthermore, the substrate is arranged on an engine turbine blade to spray a thermal resistance coating.

[0016] A method for studying the radiation characteristics of an engine environment thermal resistance coating comprises the following steps:

[0017] (a) Simulate the real engine thermal cycle and temperature environment: Use the wind tunnel to divide the test into heating, stabilization and cooling processes, construct the transient and steady-state thermal radiation characteristic environment of the coating, quantify the real thermal radiation barrier capacity and thermal insulation effect; and carry out transient and steady-state thermal radiation research in the thermal equilibrium process;

[0018] (b) Measurement of infrared spectral characteristics of high-temperature media: The infrared radiation emission spectrum of the air medium in a high-temperature environment is measured and analyzed in real time by a Fourier spectrometer to obtain the emissivity parameters;

[0019] (c) Surface temperature measurement of coating and substrate structure: without disturbing the flow field in the wind tunnel, the temperature distribution and evolution characteristics of the coating structure surface in high-temperature gas are obtained by infrared thermal imaging measurement instrument;

[0020] (d) Measurement of coating surface absorptivity and emissivity: The refractive index and absorptivity of the thermal resistance coating are obtained by using an infrared ellipsometer based on the polarized light method, thereby inverting the emissivity and transmittance of the thermal resistance coating and obtaining the emission spectrum of the thermal resistance coating.

[0021] Furthermore, the Fourier spectrometer in step (b) uses a Michelson interferometer to generate broadband coherent light interference from the detection light (infrared light), collects infrared interference pattern data through a unit detector, and obtains an infrared spectrum after Fourier transformation.

[0022] The Fourier spectroscopy measurement method has the advantages of achieving high-sensitivity multi-component simultaneous measurement, fast analysis speed, non-intrusiveness, no need for additional artificial infrared light sources, and can realize online remote sensing.

[0023] Furthermore, the infrared thermal imager in step (c) receives the infrared radiation energy distribution pattern of the measured target using an infrared detector and an optical imaging objective lens, and reflects it on the photosensitive element of the infrared detector, thereby obtaining an infrared thermal image.

[0024] Furthermore, the temperature measurement range of the infrared thermal imaging measuring instrument in step (c) is -20°C to 2000°C, and the thermal sensitivity reaches 0.01°C. Since the flow rate of high-temperature gas in the wind tunnel can reach above the speed of sound, if a thermocouple is used to measure the surface temperature of the coating, a strong shock wave structure will be triggered, causing it to burn out and fail, and seriously disturb the flow field in the wind tunnel. Infrared thermal imaging measurement technology can solve the above problems.

[0025] Furthermore, the steps for obtaining the refractive index and the absorptivity in step (d) are as follows: the infrared ellipsometer includes an incident light system and a receiving detection light system. When light is incident on the interface of the coating, reflection and refraction phenomena occur, and the detection results are used to obtain the ellipsometric parameters. The absorption and transmittance parameters of the coating are calculated and analyzed by Snell's law and Fresnel's formula to describe the intensity of each component of the reflected light and refracted light. The specific principle is as follows: Figure 3 , 4 shown.

[0026] Infrared ellipsometry is non-intrusive, non-contact, and label-free, with subatomic resolution.

[0027] In the adiabatic control body, the coating and substrate are selected as the research objects, and the input energy is mainly E 热，空 and E 辐，空，λ , the output energy is E 辐，发，λ and E 热，涂 , the input and output energy are conserved, and the following relationship is obtained:

[0028] E 热，空 +E 辐，空,λ =E 辐，发，λ +E 热，涂

[0029] Among them, E 热，空 The convection and conduction heat between air, coating and substrate obtained by infrared thermal imaging measurement method; E 辐，空，λ The radiated heat between the air, the coating and the substrate obtained by infrared thermography or infrared ellipsometric measurement; E 辐，发，λE is the heat removed by coating radiation obtained by infrared ellipsometry measurement method; 热，涂 The heat of the coating and substrate is obtained by infrared thermal imaging measurement method.

[0030] The radiation characteristics of the engine environment thermal resistance coating are obtained based on the energy relationship and various multi-field coupled thermal radiation measurement parameters.

[0031] The beneficial effects of the present invention are:

[0032] Through the above, the wind tunnel is used to construct the high heat flux density (such as 10 0 ~10 1 MW / m 2 ), high temperature (such as 1400℃), high temperature rise rate (such as 100℃ / s) environment, use Fourier spectroscopy measurement method to measure the infrared spectral characteristics of high temperature medium of coating, remote sensing, and analyze the infrared radiation emission spectrum measurement of air medium in high temperature environment to obtain emissivity parameters; infrared thermal imaging measurement method to measure the surface temperature of coating and substrate structure; infrared ellipsometric measurement method to obtain ellipsometric parameters of coating The absorptivity and transmittance parameters of the coating are obtained by analysis and calculation, and the absorptivity and emissivity of the coating surface are measured. The above three sets of optical measurement results can finally quantitatively obtain the transient and steady-state transfer relationship and evolution law between the thermal energy and radiation energy of the dielectric radiation coating, and quantitatively evaluate the transient and steady-state thermal radiation barrier rate and thermal insulation effect of the thermal resistance coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of a system for studying radiation characteristics of an engine environment thermal resistance coating provided by an embodiment of the present invention;

[0034] Figure 2 A schematic diagram of a system for studying radiation characteristics of an engine environment thermal resistance coating provided by an embodiment of the present invention;

[0035] Figure 3 A measurement principle diagram of an infrared ellipsometer for a radiation characteristic research system of an engine environment thermal resistance coating provided by an embodiment of the present invention;

[0036] Figure 4 A schematic diagram of the analysis and calculation process of an infrared ellipsometer of a radiation characteristic research system for an engine environment thermal resistance coating provided by an embodiment of the present invention;

[0037] Among them, 1. coating; 2. substrate; 101. wind tunnel; 102. Fourier spectrometer; 103. infrared thermal imager; 104. infrared ellipsometer; 104-1. light source; 104-3. polarizer 104-4; compensator; 104-2 detection light system; 104-5 analyzer. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] To facilitate understanding of the embodiments of the present invention, specific embodiments will be further explained below in conjunction with the accompanying drawings. The embodiments do not constitute a limitation on the embodiments of the present invention.

[0040] Example 1

[0041] Figure 1 A schematic diagram of the structure of a thermal radiation measurement system 100 provided in an embodiment of the present invention is shown in FIG. Figure 1 As shown, the system includes:

[0042] Wind tunnel 101, Fourier spectrometer 102, infrared thermal imager 103, infrared ellipsometer 104, Fourier spectrometer 102 is horizontally placed on one side of wind tunnel 101, infrared thermal imager 103 is horizontally placed on the other side of wind tunnel 101, incident light system and receiving detection light system of infrared ellipsometer 104 are symmetrically arranged on both sides of wind tunnel 101, and light of infrared ellipsometer 104 is irradiated on coating 2.

[0043] The above scheme is used to realize wind tunnel simulation of the real engine thermal cycle, quantitatively obtain the transient and steady-state transfer relationship and evolution law between the medium radiation and the coating thermal energy and radiation energy, and quantitatively evaluate the transient and steady-state thermal radiation barrier rate and thermal insulation effect of the thermal resistance coating.

[0044] Based on embodiment 1, in another embodiment of the present invention, the wind tunnel 101 simulates the real engine thermal cycle and multi-field coupled thermal radiation measurement;

[0045] Wind Tunnel 101 simulates the actual engine thermal cycle and uses a supersonic wind tunnel to reproduce the typical thermal cycle and temperature environment inside the engine. It is used to study and characterize the transient and steady-state thermal radiation characteristics of protective materials in high-temperature environments and quantify the actual thermal radiation barrier capacity and thermal insulation effect.

[0046] Wind Tunnel 101 simulates multi-field coupled thermal radiation measurement, using Fourier spectroscopy measurement method to measure the infrared spectral characteristics of high-temperature media, infrared thermal imaging measurement method to measure the surface temperature of coatings and substrate structures, and infrared ellipsometry measurement method to measure the surface absorptivity and emissivity of coatings.

[0047] More specifically, the coating 1 is coated on the substrate 2 and placed in the wind tunnel 101 environment. The wind tunnel 101 is set as a supersonic wind tunnel 101. The wind tunnel 101 simulates the real engine thermal cycle. The supersonic wind tunnel 101 is used to reproduce the typical thermal cycle and temperature environment inside the engine, and is used to study and characterize the transient and steady-state thermal radiation characteristics of the coating 1 under high temperature environment, quantify the real thermal radiation barrier capacity and the thermal insulation effect of the coating 1 on the substrate 2; the temperature rise rate of the wind tunnel 101 test section can reach 100℃ / s, so as to construct a large heat flux density (such as 10 0 ~10 1 MW / m 2 ), high temperature (such as 1400℃), high temperature rise rate (such as 100℃ / s) environment. The test is divided into heating, stabilization and cooling processes, which can construct the transient and steady-state thermal radiation characteristic environment of coating 1 to carry out transient and steady-state thermal radiation research in thermal equilibrium process.

[0048] Based on Embodiment 1, in another embodiment of the present invention, the Fourier spectrum measuring instrument 102 measures ( Figure 1 The infrared spectrum is obtained by using a Michelson interferometer to generate broadband coherent light interference from the detection light (infrared light), and the infrared interference pattern data is collected by a unit detector. After Fourier transformation, an infrared spectrum is obtained. It has the advantages of high-sensitivity multi-component simultaneous measurement, fast analysis speed, non-invasiveness, and no need for additional artificial infrared light sources. It can also realize online remote sensing, and obtain parameters such as emissivity through real-time remote sensing and analysis of the infrared radiation emission spectrum of the air medium in a high-temperature environment.

[0049] Based on Embodiment 1, in another embodiment of the present invention, the infrared thermal imaging measuring instrument 103 ( Figure 1 The infrared detector and optical imaging objective lens receive the infrared radiation energy distribution diagram of the measured target, and reflect it on the photosensitive element of the infrared detector, thereby obtaining an infrared thermal image. Its temperature measurement range is -20℃~2000℃, and the thermal sensitivity can reach 0.01℃. Since the flow velocity of the high-temperature gas in the wind tunnel 101 can reach above the speed of sound, if a thermocouple is used to measure the surface temperature of the coating 1, a strong shock wave structure will be triggered, causing it to burn out and fail, and seriously disturbing the flow field in the wind tunnel 101. The infrared thermal imager 103 can solve the above problems and obtain the temperature distribution and evolution characteristics of the surface of the coating 1 structure in the high-temperature gas without disturbing the flow field in the wind tunnel 101.

[0050] Based on Embodiment 1, in another embodiment of the present invention, the infrared ellipsometer 104 ( Figure 1The imaging method is mainly composed of a light source 104-1, a detection light system 104-2, a polarizer 104-3, a compensator 104-4 and an analyzer 104-5. The measurement is based on the polarization light method, including an incident light system and a receiving detection light system. When the light source 104-1 incidents the polarized light onto the interface between the coating and the substrate through the polarizer 104-3 and the compensator 104-4, reflection and refraction will occur. The reflected light and the refracted light contain the target features of the substrate and the coating. The intensity of each component in the reflected light and the refracted light is described by Snell's law and Fresnel's formula. The reflected light and the refracted light are received by the analyzer 104-5 and the detection light system 104-2. By solving the following calculations: Figure 4 As shown, the parameters are defined as follows: N1: material complex refractive index; λ: incident light wavelength; h: Planck constant; k B : Boltzmann constant; α λ (T): absorptivity; Φ0: incident angle; Φ1: refraction angle in the material; N0: ambient refractive index; Ψ: amplitude; Δ: phase; N1: complex refractive index n: refractive index κ: absorption coefficient. Then the refractive index and absorptivity of the substrate 2 and the thermal resistance coating 1 are obtained, so as to invert the emissivity and transmittance of the thermal resistance coating 1 and obtain the emission spectrum of the thermal resistance coating 1. The measurement has the advantages of non-disturbance, non-contact, non-marking, and subatomic level resolution. The principle structure of the infrared ellipsometer 104 is shown in FIG. Figure 3 shown.

[0051] On the basis of the above-mentioned embodiment, another embodiment of the present invention is a method for studying the radiation characteristics of an engine environment thermal resistance coating, which specifically includes the following steps:

[0052] (a) Simulating the real engine thermal cycle and temperature environment: The test is divided into heating, stabilization and cooling processes through a wind tunnel, and the transient and steady-state thermal radiation characteristic environment of coating 1 is constructed to quantify the real thermal radiation barrier capacity and thermal insulation effect; so as to carry out transient and steady-state thermal radiation research in the thermal equilibrium process;

[0053] (b) Measurement of infrared spectral characteristics of high-temperature media: The infrared radiation emission spectrum of the air medium in a high-temperature environment is measured and analyzed in real time by a Fourier spectrometer to obtain the emissivity parameters;

[0054] (c) Measurement of the surface temperature of the coating and substrate structure: without interfering with the flow field in the wind tunnel, the temperature distribution and evolution characteristics of the surface of the coating 1 structure in the high-temperature gas are obtained by using an infrared thermal imager 103;

[0055] (d) Measurement of coating surface absorptivity and emissivity: The infrared ellipsometer 104 is used to measure based on the polarized light method to obtain the refractive index and absorptivity of the thermal resistance coating 1, thereby inverting the emissivity and transmittance of the thermal resistance coating 1 to obtain the emission spectrum of the thermal resistance coating 1.

[0056] In another embodiment of the present invention, the Fourier spectrometer 102 in step (b) uses a Michelson interferometer to generate broadband coherent light interference from the detection light (infrared light), collects infrared interference pattern data through a unit detector, and obtains an infrared spectrum after Fourier transformation.

[0057] The Fourier spectroscopy measurement method has the advantages of achieving high-sensitivity multi-component simultaneous measurement, fast analysis speed, non-intrusiveness, no need for additional artificial infrared light sources, and can realize online remote sensing.

[0058] In another embodiment of the present invention, the infrared thermal imager 103 in step (c) uses an infrared detector and an optical imaging objective lens to receive the infrared radiation energy distribution pattern of the measured target and reflects it on the photosensitive element of the infrared detector, thereby obtaining an infrared thermal image.

[0059] In step (c), the temperature measurement range of the infrared thermal imager 103 is -20°C to 2000°C, and the thermal sensitivity reaches 0.01°C. Since the flow rate of high-temperature gas in the wind tunnel can reach above the speed of sound, if a thermocouple is used to measure the surface temperature of the coating, a strong shock wave structure will be triggered, causing it to burn out and fail, and seriously disturbing the flow field in the wind tunnel. Infrared thermal imaging measurement technology can solve the above problems.

[0060] In another embodiment of the present invention, the steps for obtaining the refractive index and the absorptivity in step (d) are as follows: the infrared ellipsometer 104 includes an incident light system and a receiving detection light system. When light is incident on the interface of the coating 1, reflection and refraction phenomena occur, and the detection results are used to obtain the ellipsometric parameters. The absorption and transmittance parameters of the coating are calculated and analyzed by Snell's law and Fresnel's formula to describe the intensity of each component of the reflected light and refracted light. The specific principle is as follows: Figure 3 , 4 shown.

[0061] Infrared ellipsometry is non-intrusive, non-contact, and label-free, with subatomic resolution.

[0062] like Figure 2 As shown in the figure, in the adiabatic control body, the coating and substrate are selected as the research objects, and the input energy is mainly E 热，空 (Convection and conduction heat between air, coating and substrate obtained by infrared thermal imaging measurement method), E 辐，空，λ (The radiant heat between the air, the coating and the substrate is obtained by infrared thermal imaging measurement method (imaging method for short) or infrared ellipsometric measurement method), and the output energy is E 辐，发，λ (heat removal by radiation emitted by the coating measured using infrared ellipsometry) and E 热，涂(The heat of the coating and substrate is obtained by infrared thermal imaging measurement method (imaging method for short). Input and output energy are conserved, and the following relationship is obtained:

[0063] E 热，空 +E 辐，空,λ =E 辐，发，λ +E 热，涂

[0064] Therefore, the radiation characteristics of the engine environment thermal resistance coating can be obtained based on the energy relationship and various multi-field coupled thermal radiation measurement parameters.

[0065] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A system for studying the radiation characteristics of engine environmental thermal resistance coatings, characterized in that: It includes a wind tunnel (101), a Fourier spectrometer (102), an infrared thermal imager (103), and an infrared ellipsometer (104). A substrate (2) coated with a coating (1) is placed in the wind tunnel (101), the wind tunnel (101) is configured as a supersonic wind tunnel (101), and the temperature rise rate of the test section of the wind tunnel (101) reaches 100°C / s, so as to construct a 100°C / s supersonic wind tunnel (101) having a substrate and a thermal resistance coating. 0 ~10 1 MW / m 2 High heat flux, 1400℃ high temperature, 100℃ / s high temperature rise rate environment; The Fourier spectrometer (102) is horizontally placed on one side of the wind tunnel (101), the infrared thermal imager (103) is horizontally placed on the other side of the wind tunnel (101), the incident light system and the receiving detection light system of the infrared ellipsometer (104) are symmetrically arranged on both sides of the wind tunnel (101), and the light of the infrared ellipsometer (104) is irradiated on the coating (2); The infrared ellipsometer (104) performs measurement based on the polarization method, and includes an incident light system and a receiving detection light system. The incident light system is sequentially provided with a light source (104-1), a polarizer (104-3), and a compensator (104-4). The receiving detection light system is sequentially provided with a detection light system (104-2) and an analyzer (104-5). When the light source (104-1) passes through the polarizer (104-3) and the compensator (104-4) to incident polarized light onto the coating and the substrate, When the substrate (2) and the thermal resistance coating (1) are connected to each other, reflection and refraction occur. The reflected light and the refracted light respectively contain the target features of the substrate and the coating. The intensity of each component in the reflected light and the refracted light is described by Snell's law and Fresnel's formula. The reflected light and the refracted light are received by the polarizer (104-5) and the detection light system (104-2). The refractive index and absorptivity of the substrate (2) and the thermal resistance coating (1) are obtained by solving the calculation, thereby inverting the emissivity and transmittance of the thermal resistance coating (1) and obtaining the emission spectrum of the thermal resistance coating (1); The Fourier spectrometer (102) measures by using a Michelson interferometer to generate broadband coherent light interference from the detection light, collecting infrared interference pattern data through a unit detector, and obtaining an infrared spectrum after Fourier transformation; The infrared thermal image measuring instrument (103) uses an infrared detector and an optical imaging objective lens to receive the infrared radiation energy distribution pattern of the measured target and reflects it on the photosensitive element of the infrared detector, thereby obtaining an infrared thermal image.

2. A radiation characteristic research method using the engine environment thermal resistance coating radiation characteristic research system as claimed in claim 1, characterized in that: The specific steps include: (a) Simulating the actual engine thermal cycle and temperature environment: The test is divided into heating, stabilization and cooling processes through a wind tunnel (101), the transient and steady-state thermal radiation characteristic environment of the coating (1) is constructed, and the actual thermal radiation barrier capability and thermal insulation effect are quantified; (b) Infrared spectrum characteristic measurement of high temperature medium: using a Fourier spectrum measuring instrument (102) to remotely measure and analyze the infrared radiation emission spectrum of the air medium in the high temperature environment in real time to obtain the emissivity parameter; (c) Measurement of the surface temperature of the coating and the substrate structure: without interfering with the flow field in the wind tunnel (101), the temperature distribution and evolution characteristics of the surface of the coating (1) structure in the high-temperature gas are obtained by using an infrared thermal imaging measuring instrument (103); (d) Measurement of coating surface absorptivity and emissivity: The refractive index and absorptivity of the thermal resistance coating (1) are obtained by measuring the thermal resistance coating (1) based on the polarized light method using an infrared ellipsometer (104), thereby inverting the emissivity and transmittance of the thermal resistance coating (1) and obtaining the emission spectrum of the thermal resistance coating (1).

3. The radiation characteristics research method according to claim 2, characterized in that: The Fourier spectrometer (102) in step (b) uses a Michelson interferometer to generate broadband coherent light interference from the detection light, collects infrared interference pattern data through a unit detector, and obtains an infrared spectrum after Fourier transformation.

4. The radiation characteristics research method according to claim 2, characterized in that: The infrared thermal imager (103) in step (c) receives the infrared radiation energy distribution pattern of the measured target by using an infrared detector and an optical imaging lens, and reflects it on the photosensitive element of the infrared detector, thereby obtaining an infrared thermal image.

5. The radiation characteristics research method according to claim 2, characterized in that: In the step (c), the temperature measurement range of the infrared thermal imaging measuring instrument (103) is -20°C to 2000°C, and the thermal sensitivity reaches 0.01°C.

6. The radiation characteristics research method according to claim 2, characterized in that: The steps for obtaining the refractive index and the absorption rate in step (d) are as follows: the infrared ellipsometer (104) includes an incident light system and a detection light system. When light is incident on the interface of the coating (1), reflection and refraction phenomena occur, and the detection results are used to obtain the ellipsometric parameters. The absorptivity and transmittance parameters of the coating are obtained by analysis and calculation to describe the intensity of each component of the reflected light and refracted light.

7. The radiation characteristics research method according to claim 2, characterized in that: In the adiabatic control body, the coating and substrate are selected as the research objects, and the input energy is mainly E 热，空 and E 辐，空，λ , the output energy is E 辐，发，λ and E 热，涂 , the input and output energy are conserved, and the following relationship is obtained: AND 热，空 +E 辐，空，λ =And 辐，发，λ +E 热，涂 Among them, E 热，空 The convection and conduction heat between air, coating and substrate obtained by infrared thermal imaging measurement method; E 辐，空，λ The radiated heat between the air, the coating and the substrate obtained by infrared thermography or infrared ellipsometric measurement; E 辐，发，λ E is the heat removed by coating radiation obtained by infrared ellipsometry measurement method; 热，涂 The heat of the coating and substrate is obtained by infrared thermography measurement method; The radiation characteristics of the engine environment thermal resistance coating are obtained based on the energy relationship and various multi-field coupled thermal radiation measurement parameters.

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