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在高温校准风洞上,对测量航空发动机燃烧室出口温度气冷式和非气冷式这两种形式的高温热电偶进行校准,确定了高温热电偶的辐射修正系数.校准实验结果表明:高温热电偶的辐射误差随气流速度和压力的增加而降低,而且气流温度与航空发动机机匣壁面温度的温差越大,辐射误差也越大.比较两种结构形式的高温热电偶,非冷却式高温热电偶的测量误差比气冷式高温热电偶的相对较小.
On the high-temperature calibration wind tunnel, two kinds of high temperature thermocouples, air-cooled and non-air-cooled, which measure the outlet temperature of the aeroengine combustion chamber, were calibrated to determine the radiation correction coefficient of the high temperature thermocouple.The calibration experiment results show that the high temperature The radiation error of the thermocouple decreases with the increase of the air velocity and pressure, and the greater the temperature difference between the airflow temperature and the wall temperature of the aero-engine casing, the greater the radiation error is.Comparing the two types of high temperature thermocouples, non-cooling high temperature Thermocouple measurement error than the air-cooled high temperature thermocouple is relatively small.