CN113063819A - System and method for researching radiation characteristic of engine environment thermal resistance coating - Google Patents
System and method for researching radiation characteristic of engine environment thermal resistance coating Download PDFInfo
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- CN113063819A CN113063819A CN202110409719.0A CN202110409719A CN113063819A CN 113063819 A CN113063819 A CN 113063819A CN 202110409719 A CN202110409719 A CN 202110409719A CN 113063819 A CN113063819 A CN 113063819A
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Abstract
The invention discloses a system and a method for researching radiation characteristics of an engine environment thermal resistance coating, wherein the system comprises a wind tunnel, a Fourier spectrum measuring instrument, an infrared thermal imaging measuring instrument and an infrared ellipsometry measuring instrument, and the system respectively adopts the Fourier spectrum measuring method to measure infrared spectrum characteristics of a high-temperature medium, the infrared thermal imaging measuring method to measure the surface temperature of a coating and a matrix structure, and the infrared ellipsometry measuring method to measure the surface absorptivity and emissivity of the coating. The method can quantitatively obtain the transient and steady state transfer relationship and the evolution law between the medium radiation and the coating heat energy and the radiation energy under the simulation of the wind tunnel to simulate the real engine thermal cycle, can quantitatively obtain the transient and steady state transfer relationship and the evolution law between the medium radiation coating heat energy and the radiation energy, and quantitatively evaluate the transient and steady state thermal radiation blocking rate and the thermal insulation effect of the thermal resistance coating.
Description
Technical Field
The invention belongs to the technical field of thermal environment test research, and particularly relates to a system and a method for researching radiation characteristics of a thermal resistance coating in an engine environment, wherein the system and the method are used for simulating multi-field coupling under real engine thermal cycle by a wind tunnel.
Background
In order to test the barrier effect of various heat insulation technologies on high-temperature environments, a large number of thermal environment test researches are carried out at home and abroad: the thermal test system using quartz lamp radiation heating as heat source was adopted in domestic and foreign structural thermal laboratories in the 60 s. Such test systems, typically range in total power from several kilowatts to hundreds of thousands of kilowatts; by the 70 s researchers began developing graphite heaters. Processing graphite into a heating element according to the shape of a test object, heating the test object by using the radiant heat of the graphite heating element to form a novel radiant heating test system taking the graphite as the heating element, increasing the temperature of the test object to 1200-1600 ℃, improving the heating rate, and most typically testing the leading edge and nose cone thermal structure of the space shuttle; while developing graphite heaters, a convection heating test system using high-temperature and high-pressure gas as a heat source, such as a Thermal Protection System Test (TPSTF) in the United states, a thermal protection system (HTST) (8-foot high-temperature structure wind tunnel) and the like, is also researched, and the test system adopts a chemical reaction of high-pressure gas and fuel to generate high-temperature, high-pressure and high-speed airflow to heat the surface of a test object, so that the heat release capacity of a protective thermal structure and the heat bearing capacity of the thermal structure are examined. The heating equipment for creating high temperature environment at present mainly comprises three types: firstly, a solar furnace; secondly, an arc lamp; third, quartz lamp and graphite heating element. The graphite heater is often used in a test for testing the heat transfer performance of the thermal protection structure due to the advantages of high heating temperature, uniform temperature zone, long operation time and the like. However, the temperature rise rate of the heating device commonly used at present is very low (<5 ℃), and the existing test equipment is mostly used for representing the steady-state heat radiation characteristic of the protective material in a high-temperature environment.
The actual temperature rise rate of the engine can reach 100 ℃, and along with extreme temperature change, the material is quickly changed under thermal stress, so that the problems of thermal expansion, thermal deformation and the like are easily caused. The expansion and deformation of the material can bring adverse effects to the mechanical properties and the heat insulation protection effect of the surface coating, and even induce the failure of the coating. Therefore, the transient and steady-state thermal characteristics of the thermal resistance coating are important in the process of exploring the rapid change of the temperature rise.
Therefore, a multi-field coupled engine environment thermal resistance coating radiation characteristic research system and method under the condition that a wind tunnel simulates real engine thermal cycle needs to be developed.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a system and a method for researching the radiation characteristics of an engine environment thermal-resistance coating, which can quantitatively obtain the transient and steady state transfer relationship and the evolution law between medium radiation and coating heat energy and radiation energy under the condition that a wind tunnel simulates the heat cycle of a real engine, and quantitatively evaluate the transient and steady state thermal radiation blocking rate and the heat insulation effect of the thermal-resistance coating.
The technical scheme adopted by the invention is as follows:
a system for researching radiation characteristics of an engine environment thermal resistance coating comprises a wind tunnel, a Fourier spectrum measuring instrument, an infrared thermal imaging measuring instrument and an infrared ellipsometry measuring instrument, so that transient and steady state transfer relations and evolution rules among medium radiation, coating heat energy and radiation energy are obtained quantitatively under the simulation of real engine thermal circulation of the wind tunnel, and transient and steady state thermal radiation blocking rates and thermal insulation effects of the thermal resistance coating are evaluated quantitatively.
The wind tunnel is placed with a coated substrate, i.e. a thermal barrier coating on the turbine blades of the engine, to examine the density of the heat flux for long term resistance (e.g. 10)0～101MW/m2) The thermal-resistant coating has the thermal insulation effect on a substrate (namely an engine turbine blade) under the environment of high temperature (such as 1400 ℃) and high temperature rise rate (such as 100 ℃/s).
The Fourier spectrum measuring instrument is horizontally arranged on one side of the wind tunnel, the infrared thermal imaging measuring instrument is horizontally arranged on the other side of the wind tunnel, the incident light system and the receiving and detecting light system of the infrared ellipsometry measuring instrument are symmetrically arranged on two sides of the wind tunnel, and light of the infrared ellipsometry measuring instrument irradiates on the coating (2).
Furthermore, the wind tunnel is set as an ultrasonic wind tunnel, and the temperature rise rate of the test section of the wind tunnel reaches 100 ℃/s. To construct a high heat flux density (e.g., 10) of the substrate and thermal barrier coating0～101MW/m2) High temperature (e.g., 1400 deg.C), high temperature ramp rate (e.g., 10 deg.C)2deg.C/s) environment.
The wind tunnel simulates real engine thermal cycle and multi-field coupling thermal radiation measurement;
the wind tunnel simulates real engine thermal circulation, reproduces typical thermal circulation and temperature environment in the engine by using the supersonic wind tunnel, is used for researching and representing transient and steady-state thermal radiation characteristics of the protective material in a high-temperature environment, and quantifies real thermal radiation blocking capability and thermal insulation effect;
the multi-field coupling thermal radiation measurement is to respectively adopt a Fourier spectrum measurement method to measure the infrared spectrum characteristic of the high-temperature medium, an infrared thermal image measurement method to measure the surface temperature of the coating and the matrix structure, and an infrared ellipsometry measurement method to measure the surface absorptivity and emissivity of the coating.
The infrared ellipsometer is characterized by comprising an incident light system and a receiving and detecting light system, wherein the incident light system is sequentially provided with a light source, a polarizer and a compensator, the receiving and detecting light system is sequentially provided with a detecting light system and an analyzer, when the light source passes through the polarizer and the compensator to enable polarized light to enter an interface between the coating and the substrate, reflection and refraction phenomena can occur, the reflected light and the refracted light respectively comprise target characteristics of the substrate and the coating, the intensity of each component in the reflected light and the refracted light can be described through Snell's law and a Fresnel formula, the reflected light and the refracted light can be received by the analyzer and the detecting light system, and the refractive indexes and the absorption rates of the substrate and the thermal resistance coating can be obtained through calculation, so that the refractive indexes and the transmittance of the thermal resistance coating can be inverted, and the emission spectrum of the thermal resistance coating.
Further, the base body is arranged on the turbine blade of the engine and is sprayed with the thermal-resistant coating.
A method for researching radiation characteristics of an engine environment thermal resistance coating specifically comprises the following steps:
a. simulating a real engine thermal cycle and temperature environment: dividing the test into heating, stabilizing and cooling processes through a wind tunnel, constructing transient and steady thermal radiation characteristic environments of the coating, and quantifying real thermal radiation blocking capability and thermal insulation effect; to develop transient and steady state thermal radiation research in the thermal equilibrium process;
b. measuring the infrared spectrum characteristic of the high-temperature medium: carrying out real-time remote measurement and analysis on infrared radiation emission spectrum measurement of an air medium in a high-temperature environment by using a Fourier spectrum measuring instrument to obtain emissivity parameters;
c. measuring the surface temperature of the coating and the matrix structure: on the basis of not interfering a flow field in the wind tunnel, acquiring the temperature distribution and the evolution characteristics of the surface of the coating structure in the high-temperature gas through an infrared thermal imaging measuring instrument;
d. coating surface absorptivity and emissivity measurement: the refractive index and the absorptivity of the thermal resistance coating are obtained by measuring through an infrared ellipsometry measuring instrument based on a polarized light method, so that the emissivity and the transmissivity of the thermal resistance coating are inverted, and the emission spectrum of the thermal resistance coating is obtained.
Further, the fourier spectrum measuring instrument in the step (b) generates broadband coherent light interference on the detection light (infrared light) by using a michelson interferometer, acquires infrared interferogram data by using a unit detector, and obtains an infrared spectrogram after fourier transform.
The Fourier spectrum measuring method has the advantages of high-sensitivity simultaneous measurement of multiple components, high analysis speed, non-invasion, no need of an additional artificial infrared light source and the like, and can realize online remote measurement.
Further, the thermal infrared imager in the step (c) receives the infrared radiation energy distribution pattern of the detected target by using the infrared detector and the optical imaging objective lens, and reflects the infrared radiation energy distribution pattern on a photosensitive element of the infrared detector, so as to obtain an infrared thermal image.
Further, the temperature measuring range of the thermal infrared imager in the step (c) is-20 ℃ to 2000 ℃, and the thermal sensitivity reaches 0.01 ℃. Because the flow velocity of high-temperature gas in the wind tunnel can reach above the sound velocity, if the surface temperature of the coating is measured by a thermocouple, a strong shock wave structure can be caused to cause burning failure, and the flow field in the wind tunnel is seriously interfered, and the infrared thermal imaging measurement technology can solve the problems.
Further, the step (d) of obtaining the refractive index and the absorption rate comprises the following steps: the infrared ellipsometer comprises an incident light system and a receiving and detecting light system, when light is incident to the interface of the coating, reflection and refraction phenomena occur, and ellipsometry parameters are obtained from the detection result
The absorption rate and transmittance parameters of the coating are obtained through analytical calculation by Snell's law and Fresnel formula, and the intensity of each component in the reflected light and the refracted light is described, and the specific principle is shown in FIGS. 3 and 4.
The infrared ellipsometry measurement method has the characteristics of no disturbance, no contact and no mark, and has resolution of sub-atomic level.
In the thermal insulation control body, the coating and the substrate are selected as research objects, and the input energy of the research objects is mainly EHeat, airAnd ESpoke, space, λThe output energy is ERadiation, hair, lambdaAnd EThermal coatingThe input and output energy is conserved, and the following relational expression is obtained:
Eheat, air+ESpoke, space, λ＝ERadiation, hair, lambda+EThermal coating
Wherein E isHeat, airConvection and heat conduction among air, a coating and a matrix are obtained by adopting an infrared thermography measurement method; eSpoke, space, λThe radiation heat among the air, the coating and the substrate is obtained by adopting an infrared thermography measurement method or an infrared ellipsometry measurement method; eRadiation, hair, lambdaRadiating heat for the coating obtained by an infrared ellipsometry method; eThermal coatingThe heat of the coating and the substrate is obtained by adopting an infrared thermography measurement method.
And obtaining the radiation characteristic of the thermal resistance coating in the environment of the engine according to the energy relation and the measurement parameters of the multi-field coupling thermal radiation.
The invention has the beneficial effects that:
through the method, the wind tunnel is utilized to construct the high heat flux density (such as 10) required by the thermal resistance coating on the turbine blade of the engine under the severe working condition0～101MW/m2) Measuring the infrared spectrum characteristic of the coating high-temperature medium by a Fourier spectrum measuring method in a high-temperature (such as 1400 ℃) and high-temperature rise rate (such as 100 ℃/s) environment, telemetering, and analyzing the infrared radiation emission spectrum measurement of the air medium in the high-temperature environment to obtain emissivity parameters; measuring the surface temperature of the coating and the matrix structure by an infrared thermal image measuring method; method for obtaining ellipsometry parameters of coating by infrared ellipsometry measurement method
And the absorption rate and transmittance parameters of the coating are obtained through analysis and calculation, so that the absorption rate and the emissivity of the surface of the coating are measured. The transient and steady state transfer relation and the evolution law between the heat energy of the medium radiation coating and the radiation energy can be quantitatively obtained finally through the three groups of optical measurement results, and the transient and steady state thermal radiation blocking rate and the thermal insulation effect of the thermal resistance coating are quantitatively evaluated.
Drawings
FIG. 1 is a schematic diagram of a system for researching radiation characteristics of an environmental thermal barrier coating of an engine according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a system for researching radiation characteristics of an environmental thermal barrier coating of an engine according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an infrared ellipsometer of a system for studying radiation characteristics of an environmental thermal barrier coating of an engine according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an analysis and calculation process of an infrared ellipsometer of a system for studying radiation characteristics of an environmental thermal barrier coating of an engine according to an embodiment of the present invention;
wherein, 1, coating; 2. a substrate; 101. a wind tunnel; 102. a Fourier spectrometer; 103. an infrared thermal image measuring instrument; 104. an infrared ellipsometer; 104-1, a light source; 104-3 and a polarizer 104-4; a compensator; 104-2 detecting a light system; 104-5 analyzer.
Detailed Description
In order to make the objects, 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 drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
For the convenience of understanding of the embodiments of the present invention, the following description will be further explained with reference to specific embodiments, which are not to be construed as limiting the embodiments of the present invention.
Example 1
Fig. 1 is a schematic structural diagram of a thermal radiation measurement system 100 according to an embodiment of the present invention, as shown in fig. 1, the system includes:
the wind tunnel 101, the fourier spectrum measuring instrument 102, the infrared thermal imaging instrument 103, the infrared ellipsometer 104, and the fourier spectrum measuring instrument 102 are horizontally disposed on one side of the wind tunnel 101, the infrared thermal imaging instrument 103 is horizontally disposed on the other side of the wind tunnel 101, the incident light system and the receiving and detecting light system of the infrared ellipsometer 104 are symmetrically disposed on two sides of the wind tunnel 101, and light of the infrared ellipsometer 104 is irradiated on the coating 2.
By the scheme, transient and steady state transfer relation and evolution rules between medium radiation and coating heat energy and radiation energy are obtained quantitatively under the condition that the wind tunnel simulates real engine thermal cycle, and the transient and steady state thermal radiation blocking rate and the thermal insulation effect of the thermal resistance coating are evaluated quantitatively.
On the basis of the embodiment 1, in another embodiment of the invention, the wind tunnel 101 simulates real engine thermal cycle and multi-field coupling thermal radiation measurement;
the wind tunnel 101 simulates real engine thermal circulation, reproduces typical thermal circulation and temperature environment inside the engine by using an ultrasonic wind tunnel, is used for researching and representing transient and steady-state thermal radiation characteristics of the protective material in a high-temperature environment, and quantifies real thermal radiation blocking capability and thermal insulation effect;
the wind tunnel 101 simulates multi-field coupling thermal radiation measurement, and adopts a Fourier spectrum measurement method to measure the infrared spectrum characteristic of the high-temperature medium, an infrared thermal image measurement method to measure the surface temperature of the coating and the substrate structure, and an infrared ellipsometry measurement method to measure the surface absorptivity and emissivity of the coating.
More specifically, the substrate 2 is coated with the coating 1 and placed in an air tunnel 101 environment. The wind tunnel 101 is set as a supersonic wind tunnel 101, the wind tunnel 101 simulates real engine thermal circulation, and the supersonic wind tunnel 101 is used for reproducing typical thermal circulation and temperature environment in the engine and used for researching and representing high temperatureThe transient and steady state heat radiation characteristics of the coating 1 in the environment quantify the real heat radiation blocking capability and the heat insulation effect of the coating 1 on the substrate 2; the temperature rise rate of a test section of the wind tunnel 101 can reach 100 ℃/s so as to construct large heat flow density (such as 10) of the substrate and the thermal-resistant coating0～101MW/m2) High temperature (e.g., 1400 deg.C), high temperature ramp rate (e.g., 100 deg.C/s) environment. The test is divided into heating, stabilizing and cooling processes, and transient and steady heat radiation characteristic environments of the coating 1 can be constructed so as to carry out transient and steady heat radiation research in the heat balance process.
In another embodiment of the present invention, based on embodiment 1, the fourier spectrometer 102 performs measurement (referred to as spectroscopy in fig. 1), a michelson interferometer is used to generate broadband coherent light interference for detecting light (infrared light), infrared interferogram data is collected by a unit detector, and an infrared spectrogram is obtained after fourier transform. The method has the advantages of high-sensitivity simultaneous measurement of multiple components, high analysis speed, non-invasion, no need of an additional artificial infrared light source and the like, can realize online remote measurement, and obtains parameters such as emissivity and the like by performing real-time remote measurement and analysis on the infrared radiation emission spectrum measurement of the air medium in a high-temperature environment.
Based on embodiment 1, in another embodiment of the present invention, the thermography instrument 103 (abbreviated as ellipsometry in fig. 1) receives an infrared radiation energy distribution pattern of a target to be measured by using an infrared detector and an optical imaging objective lens, and reflects the infrared radiation energy distribution pattern onto a photosensitive element of the infrared detector, so as to obtain an infrared thermography. The temperature measuring range is-20-2000 ℃, the thermal sensitivity can reach 0.01 ℃, the flow velocity of the high-temperature gas in the wind tunnel 101 can reach more than sound velocity, if the surface temperature of the coating 1 is measured by a thermocouple, a strong shock wave structure can be caused to cause burning failure, and the flow field in the wind tunnel 101 is seriously interfered, the infrared thermal image measuring instrument 103 can solve the problems, and the temperature distribution and the evolution characteristics of the surface of the coating 1 structure in the high-temperature gas can be well obtained on the basis of not interfering the flow field in the wind tunnel 101.
In another embodiment of the present invention based on embodiment 1, the infrared ellipsometer 104 (abbreviated as imaging method in fig. 1) mainly comprises a light source 104-1, a detection optical system 104-2, and a polarizer 104-3A compensator 104-4 and an analyzer 104-5. The measurement is carried out based on a polarized light method, which comprises an incident light system and a receiving and detecting light system, when a light source 104-1 emits polarized light to an interface between a coating and a substrate through a polarizer 104-3 and a compensator 104-4, reflection and refraction phenomena occur, the reflected light and the refracted light contain target characteristics of the substrate and the coating, the intensity of each component in the reflected light and the refracted light is described through Snell's law and Fresnel formula, the reflected light and the refracted light are received through an analyzer 104-5 and a detecting light system 104-2, and each parameter in the formula is defined as follows through calculation as shown in FIG. 4: n is a radical of1: the complex refractive index of the material; λ: the wavelength of the incident light wave; h: planck constant; k is a radical ofB: boltzmann constant; alpha is alphaλ(T): absorption rate; phi0: an angle of incidence; phi1: angle of refraction in the material; n is a radical of0: an ambient refractive index; Ψ: an amplitude value; Δ: a phase; n is a radical of1: complex refractive index n: refractive index κ: the absorption coefficient. And further, the refractive indexes and the absorptivity of the substrate 2 and the thermal resistance coating 1 are obtained, so that the emissivity and the transmissivity of the thermal resistance coating 1 are inverted, the emission spectrum of the thermal resistance coating 1 is obtained, and the measurement has the advantages of undisturbed, non-contact, unmarked and subatomic level resolution. The principle structure of the infrared ellipsometer 104 is shown in fig. 3.
On the basis of the above embodiment, another embodiment of the present invention is a method for studying radiation characteristics of an environmental thermal barrier coating of an engine, which specifically includes the following steps:
a. simulating a real engine thermal cycle and temperature environment: dividing the test into heating, stabilizing and cooling processes through a wind tunnel, constructing transient and steady heat radiation characteristic environments of the coating 1, and quantifying real heat radiation blocking capability and heat insulation effect; to develop transient and steady state thermal radiation research in the thermal equilibrium process;
b. measuring the infrared spectrum characteristic of the high-temperature medium: carrying out real-time remote measurement and analysis on infrared radiation emission spectrum measurement of an air medium in a high-temperature environment by using a Fourier spectrum measuring instrument to obtain emissivity parameters;
c. measuring the surface temperature of the coating and the matrix structure: on the basis of not interfering with a flow field in the wind tunnel, acquiring the temperature distribution and the evolution characteristics of the structure surface of the coating 1 in the high-temperature gas through the thermal infrared imager 103;
d. coating surface absorptivity and emissivity measurement: the measurement is performed by the infrared ellipsometer 104 based on a polarized light method, and the refractive index and the absorption rate of the thermal resistance coating 1 are obtained, so that the emissivity and the transmittance of the thermal resistance coating 1 are inverted, and the emission spectrum of the thermal resistance coating 1 is obtained.
In another embodiment of the present invention, the fourier spectrometer 102 in step (b) uses a michelson interferometer to generate broadband coherent light interference for detecting light (infrared light), and acquires infrared interferogram data by a unit detector, and performs fourier transform to obtain an infrared spectrogram.
The Fourier spectrum measuring method has the advantages of high-sensitivity simultaneous measurement of multiple components, high analysis speed, non-invasion, no need of an additional artificial infrared light source and the like, and can realize online remote measurement.
In another embodiment of the present invention, the thermal infrared imager 103 in step (c) receives the infrared radiation energy distribution pattern of the target to be measured by using the infrared detector and the optical imaging objective lens, and reflects the infrared radiation energy distribution pattern on the photosensitive element of the infrared detector, so as to obtain the infrared thermography.
The temperature measuring range of the thermal infrared imager 103 in the step (c) is-20 ℃ to 2000 ℃, and the thermal sensitivity reaches 0.01 ℃. Because the flow velocity of high-temperature gas in the wind tunnel can reach above the sound velocity, if the surface temperature of the coating is measured by a thermocouple, a strong shock wave structure can be caused to cause burning failure, and the flow field in the wind tunnel is seriously interfered, and the infrared thermal imaging measurement technology can solve the problems.
In still another embodiment of the present invention, the step (d) of obtaining the refractive index and the absorption rate comprises the steps of: the infrared ellipsometer 104 includes an incident light system and a receiving and detecting light system, when light is incident to the interface of the coating 1, reflection and refraction occur, and ellipsometry parameters are obtained from the detection result
The absorption rate and transmittance parameters of the coating are obtained by analysis and calculation through Snell's law and Fresnel formula, and the inverse description is carried outThe specific principle of the intensity of each component in the incident light and the refracted light is shown in fig. 3 and 4.
The infrared ellipsometry measurement method has the characteristics of no disturbance, no contact and no mark, and has resolution of sub-atomic level.
As shown in FIG. 2, in the thermal insulation control body, the coating and the substrate are selected as the research objects, and the input energy is mainly EHeat, air(convection and conduction between air and coating and substrate obtained by infrared thermography measurement), ESpoke, space, λThe energy output is E (the radiant heat between the air and the coating and the substrate is obtained by adopting an infrared thermography measuring method (imaging method for short) or an infrared ellipsometry measuring method)Radiation, hair, lambda(radiant emission of Heat from coatings obtained by Infrared ellipsometry) and EThermal coating(the heat quantity of the coating and the substrate is obtained by adopting an infrared thermal image measuring method (an imaging method for short)). The input and output energy is conserved, and the following relational expression is obtained:
Eheat, air+ESpoke, space, λ＝ERadiation, hair, lambda+EThermal coating
Therefore, the radiation characteristic of the thermal resistance coating in the environment of the engine can be obtained according to the energy relation and the measurement parameters of the multi-field coupling thermal radiation.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A system for researching the radiation characteristic of an environmental thermal resistance coating of an engine is characterized by comprising a wind tunnel (101), a Fourier spectrum measuring instrument (102), an infrared thermal imaging measuring instrument (103) and an infrared ellipsometer (104),
a substrate (2) coated with a coating (1) is placed in the wind tunnel (101);
the Fourier spectrum measuring instrument (102) is horizontally arranged on one side of the wind tunnel (101), the infrared thermal imaging measuring instrument (103) is horizontally arranged on the other side of the wind tunnel (101), an incident light system and a receiving and detecting light system of the infrared ellipsometer (104) are symmetrically arranged on two sides of the wind tunnel (101), and light of the infrared ellipsometer (104) irradiates on the coating (2).
2. The system for researching radiation characteristics of the thermal resistance coating in the engine environment according to claim 1, wherein the wind tunnel (101) is set to be an ultrasonic wind tunnel (101), and the temperature rise rate of the test section of the wind tunnel (101) reaches 100 ℃/s.
3. The system for researching the radiation characteristics of the thermal resistance coating in the engine environment as claimed in claim 1, wherein the infrared ellipsometer (104) performs measurement based on a polarized light method, and comprises an incident light system and a receiving and detecting 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 and detecting light system is sequentially provided with a detecting light system (104-2) and an analyzer (104-5), when the light source (104-1) irradiates polarized light to the coating and the interface on the substrate through the polarizer (104-3) and the compensator (104-4), reflection and refraction phenomena occur, the reflected light and the refracted light respectively comprise target characteristics of the substrate and the coating, and the intensity of each component in the reflected light and the refracted light is described through Snell's law and Fresnel formula, reflected light and refracted light are received by the analyzer (104-5) and the detection optical system (104-2), and the refractive indexes and the absorptivity of the base body (2) and the thermal resistance coating (1) are obtained through calculation, so that the emissivity and the transmissivity of the thermal resistance coating (1) are inverted, and the emission spectrum of the thermal resistance coating (1) is obtained.
4. A method for researching radiation characteristics of an engine environment thermal resistance coating is characterized by comprising the following steps:
a. simulating a real engine thermal cycle and temperature environment: the test is divided into heating, stabilizing and cooling processes through the wind tunnel (101), transient and steady thermal radiation characteristic environments of the coating (1) are constructed, and real thermal radiation blocking capacity and thermal insulation effects are quantized;
b. measuring the infrared spectrum characteristic of the high-temperature medium: carrying out real-time remote measurement and analysis on infrared radiation emission spectrum measurement of an air medium in a high-temperature environment by using a Fourier spectrum measuring instrument (102) to obtain emissivity parameters;
c, measuring the surface temperature of the coating and the matrix structure: on the basis of not interfering a flow field in the wind tunnel (101), acquiring the temperature distribution and the evolution characteristics of the structure surface of the coating (1) in the high-temperature gas through an infrared thermal imager (103);
d. coating surface absorptivity and emissivity measurement: the measurement is carried out by an infrared ellipsometer (104) based on a polarized light method, the refractive index and the absorptivity of the thermal resistance coating (1) are obtained, so that the emissivity and the transmissivity of the thermal resistance coating (1) are inverted, and the emission spectrum of the thermal resistance coating (1) is obtained.
5. The method for researching the radiation characteristic of the thermal resistance coating in the engine environment according to claim 4, wherein the Fourier spectrum measuring instrument (102) in the step (b) adopts a Michelson interferometer to generate broadband coherent light interference on detection light, infrared interferogram data are collected through a unit detector, and an infrared spectrogram is obtained after Fourier transformation.
6. The method for researching the radiation characteristics of the thermal barrier coating in the engine environment as claimed in claim 4, wherein the thermal infrared imager (103) in the step (c) receives the infrared radiation energy distribution pattern of the target to be detected by using an infrared detector and an optical imaging objective lens, and reflects the infrared radiation energy distribution pattern on a photosensitive element of the infrared detector, so as to obtain an infrared thermography.
7. The method for researching the radiation characteristic of the thermal resistance coating in the environment of the engine as claimed in claim 4, wherein the temperature measuring range of the thermal infrared imager (103) in the step (c) is-20 ℃ to 2000 ℃, and the thermal sensitivity reaches 0.01 ℃.
8. The method for researching the radiation characteristic of the thermal barrier coating in the environment of the engine as claimed in claim 4, wherein the method comprisesIn the step (d), the refractive index and the absorption rate are obtained as follows: the infrared ellipsometer (104) comprises an incident light system and a detection light system, when light is incident to the interface of the coating (1), reflection and refraction phenomena occur, and the detection result obtains ellipsometry parameters
The absorption rate and transmittance parameters of the coating are obtained through analysis and calculation, and the intensity of each component in the reflected light and the refracted light is described.
9. The method for researching the radiation characteristic of the thermal barrier coating in the environment of the engine as claimed in claim 4, wherein the coating and the substrate are selected as research objects in the thermal insulation control body, and the input energy is mainly EHeat, airAnd ESpoke, space, λThe output energy is ERadiation, hair, lambdaAnd EThermal coatingThe input and output energy is conserved, and the following relational expression is obtained:
Eheat, air+ESpoke, space, λ＝ERadiation, hair, lambda+EThermal coating
Wherein E isHeat, airConvection and heat conduction among air, a coating and a matrix are obtained by adopting an infrared thermography measurement method; eSpoke, space, λThe radiation heat among the air, the coating and the substrate is obtained by adopting an infrared thermography measurement method or an infrared ellipsometry measurement method; eRadiation, hair, lambdaRadiating heat for the coating obtained by an infrared ellipsometry method; eThermal coatingThe heat of the coating and the substrate is obtained by adopting an infrared thermography measurement method.
And obtaining the radiation characteristic of the thermal resistance coating in the environment of the engine according to the energy relation and the measurement parameters of the multi-field coupling thermal radiation.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117346903A (en) * | 2023-12-06 | 2024-01-05 | 江苏中正照明集团有限公司 | Heat energy detection mechanism and heat abstractor of LED lamps and lanterns |
| CN117346903B (en) * | 2023-12-06 | 2024-02-13 | 江苏中正照明集团有限公司 | Heat energy detection mechanism and heat abstractor of LED lamps and lanterns |
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