A high temperature thermal radiation performance testing device and method in a variable oxygen partial pressure environment

Abstract

The invention discloses a variable oxygen partial pressure environment high temperature heat radiation performance test device, and a test method. According to the test method, a high temperature aerobic test environment with controllable temperature and oxygen partial pressure is established on the surface of a sample, so that accurate test on material high temperature heat radiation performanceat variable oxygen partial pressure environment is realized; a variable oxygen partial pressure high temperature gas purging system is used for forming oxygen / nitrogen mixed gas purging gas flow on the surface of the sample, realizing real-time controlling of the oxygen partial pressure and gas absolute pressure of the heating environment of the sample, avoiding influences of heat radiation signals emitted by polar molecules such as water and carbon dioxide in atmosphere at high temperature on test results, and ensuring heat radiation test accuracy; synchronous heating and constant temperaturecontrol of purging gas and the sample are adopted, so that heat convection effect between the sample surface and the purging gas is inhibited effectively, and accurate temperature control of the sample surface temperature is ensured.

Description

technical field [0001] The invention relates to the field of testing thermal physical properties of materials, in particular to a testing device for high-temperature thermal radiation properties of materials. Background technique [0002] The outer heat-resistant structure of atmospheric re-entry vehicles and near-space hypersonic vehicles usually generates high surface temperature due to the aerodynamic heating effect. According to Planck's law, the amount of thermal radiation and heat dissipation on the surface of a material increases with the increase of temperature in the form of a fourth power function. During high-temperature service, the radiation heat exchange between the aircraft's heat-resistant structure and outer space is the most important way of heat dissipation. one. Obtaining the high-temperature thermal radiation performance of heat-resistant materials through ground tests is of great value for the design and calculation of aircraft heat-resistant structure...

AI Technical Summary

Problems solved by technology

[0006] However, the existing material thermal emissivity test device cannot complete the high-temperature thermal emissivity test of materials in a variable oxygen partial pressure environment.

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