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Coaxial Thermocouples for Heat Transfer Measurements in Long-Duration High Enthalpy Flows

机译：用于长期高焓流的热传递测量的同轴热电偶

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Coaxial thermocouples have the advantages of fast response and good durability. They are widely used for heat transfer measurements in transient facilities, and researchers have also considered their use for long-duration heat transfer measurements. However, the model thickness, transverse heat transfer, and changes in the physical parameters of the materials with increasing temperature influence the accuracy of heat transfer measurements. A numerical analysis of coaxial thermocouples is conducted to determine the above influences on the measurement deviation. The minimum deviation is obtained if the thermal effusivity of chromel that changes with the surface temperature is used to derive the heat flux from the surface temperature. The deviation of the heat flux is less than 5.5% when the Fourier number is smaller than 0.255 and 10% when the Fourier number is smaller than 0.520. The results provide guidance for the design of test models and coaxial thermocouples in long-duration heat transfer measurements. The numerical calculation results are verified by a laser radiation heating experiment, and heat transfer measurements using coaxial thermocouples in an arc tunnel with a test time of several seconds are performed.
机译：同轴热电偶具有快速响应和良好耐用性的优点。它们广泛用于瞬态设施中的传热测量，研究人员还考虑了它们用于长期传热测量的用途。然而，模型厚度，横向传热和材料物理参数的变化随着温度的提高，影响了传热测量的准确性。进行同轴热电偶的数值分析，以确定对测量偏差的上述影响。如果使用表面温度变化的铬的热力积液来获得最小偏差，则用于从表面温度导出热通量。当傅里叶数小于0.255和10％时，热通量的偏差小于5.5％，当傅立叶数小于0.520时。结果为长持续时间传热测量的测试模型和同轴热电偶设计提供了指导。通过激光辐射加热实验验证数值计算结果，并且执行使用弧形隧道中的同轴热电偶的传热测量，并且进行几秒钟的测试时间。

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