In this paper, the radiation spectra of quartz composite ceramic thermal protective materials in a pneumatic environment were measured in a plasma arc wind tunnel experiment. Spectral emissivities and material temperature at varying airflow speeds were calculated based on the algorithm of slow variation properties of emissivity. The inversion results show that the spectral emissivity reaches its maximum at a maximum airflow velocity of Mach 10. Emissivity uncertainty caused by the spectral measurement was analyzed. Relative error was determined by comparing real and calculated emissivities from Standard blackbody radiation spectrums at 2298 K in the wavelength range of 420–900 nm and 1573 K for 1200–2400 nm. Results obtained by the algorithm of slow variation properties for emissivity show that the maximum relative error in 420–900 nm is 3.3% and the average relative error is 2.7%; the maximum relative error for 1400–2400 nm is 4.1% and the average relative error is 2.1%. This p...

中文翻译：

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高超声速气流碰撞下石英复合陶瓷的光谱发射率反演

本文通过等离子弧风洞实验测量了石英复合陶瓷热防护材料在气动环境下的辐射光谱。基于发射率缓慢变化特性的算法，计算了在不同气流速度下的光谱发射率和材料温度。反演结果表明，在最大气流速度为10马赫时，光谱发射率达到最大值。分析了由光谱测量引起的发射率不确定性。相对误差是通过比较标准黑体辐射光谱在420–900 nm和1200–2400 nm波长范围内2298 K和1573 K的实际发射率和计算发射率来确定的。通过发射率缓慢变化特性算法获得的结果表明，在420-900 nm处的最大相对误差为3。3％，平均相对误差为2.7％；1400–2400 nm的最大相对误差为4.1％，平均相对误差为2.1％。这个...