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首页> 外文期刊>Journal of Heat Transfer >Dynamic Calibration of a Coaxial Thermocouples for Short Duration Transient Measurements
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Dynamic Calibration of a Coaxial Thermocouples for Short Duration Transient Measurements

机译：短时瞬态测量的同轴热电偶的动态校准

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摘要

Coaxial thermocouple sensors are suitable for measuring highly transient surface heat fluxes because the response times of these sensors are very small (～0.1 ms). These robust sensors have the flexibility of mounting them directly on the surface of any geometry. So, they have been routinely used in ground-based impulse facilities as temperature sensors where rapid changes in heat loads are expected on aerodynamic models. Subsequently, the surface heat fluxes are predicted from the transient temperatures by appropriate one-dimensional heat conduction modeling for semi-infinite body. In this backdrop, the purpose of this work is to design and fabricate K-type coaxial thermocouples in-house and calibrate them under similar nature of heat loads by using simple laboratory instruments. Here, two methods of dynamic calibration of coaxial thermocouples have been discussed, where the known step loads are applied through radiation and conduction modes of heat transfer. Using appropriate one dimensional heat conduction modeling, the surface heat fluxes are predicted from the measured temperature histories and subsequently compared with the input heat loads. The recovery of surface heat flux from laser based calibration experiment under-predicts by 4% from its true input heat load. Similarly, recovery of surface heat flux from the conduction mode calibration experiments under-predicts 6% from its true input value. Further, finite-element based numerical study is performed on the coaxial thermocouple model to obtain surface temperatures with same heat loads as used in the experiments. The recovery of surface temperatures from finite element simulation is achieved within an accuracy of ±0.3% from the experiment.
机译：同轴热电偶传感器适用于测量高瞬态表面热通量，因为这些传感器的响应时间非常短（〜0.1 ms）。这些坚固的传感器具有将它们直接安装在任何几何形状的表面上的灵活性。因此，它们已常规地用于基于地面的脉冲设施中，作为温度传感器，在空气动力学模型中，热负荷预计会快速变化。随后，通过适当的半无限体一维热传导模型，根据瞬态温度预测表面热通量。在这种背景下，这项工作的目的是在内部设计和制造K型同轴热电偶，并通过使用简单的实验室仪器在相似的热负荷性质下对其进行校准。在这里，已经讨论了两种动态校准同轴热电偶的方法，其中已知的阶跃载荷通过热传递的辐射和传导模式施加。使用适当的一维热传导模型，可以根据测得的温度历史预测表面热通量，然后将其与输入的热负荷进行比较。从基于激光的校准实验中回收的表面热通量比其实际输入热负荷低4％。同样，从传导模式校准实验中回收的表面热通量会从其真实输入值中低估6％。此外，在同轴热电偶模型上进行了基于有限元的数值研究，以获得与实验中使用的热负荷相同的表面温度。从有限元模拟中恢复的表面温度在实验中的精度为±0.3％。

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