Improvement of heat insulation structure in the slug calorimeter and test analysis
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摘要: 为了提高塞块式量热计的热流测量精准度，对其隔热结构进行了改进：将原隔热套改为中空结构，大幅度减小量热基体的不稳定侧向传热；设计了与改进隔热套匹配的封装壳结构，使量热计标定时的隔热特性能够完整保留至测试环境中。经数值计算和优化，确定了量热计各部件的较优尺寸，验证了改进措施的有效性。热流标定对比试验结果表明：改进后的塞块式量热计的测量准度和精度都有较大提高。风洞试验考核结果表明：单个塞块式量热计的重复性精度优于3%；不同塞块式量热计的个体差异小，在对称位置，测量偏差小于3%；与水冷戈登计比较，相同来流条件下测量偏差小于4%。Abstract: The heat insulation structure of the slug calorimeter was improved in order to enhance the measurement accuracy. The insulating sleeve with hollow structure was designed, which could excessively decrease the unstable lateral heat transfer. By designing package shell structure matched with the slug calorimeter, the heat insulation structure and heat transfer characteristics in calibration could be kept in the heat flux measurement. Numerical calculation analysis was given, which illustrates the validation of the improvement method. Based on the numerical calculation, the size of the slug calorimeter components was optimized. Then the calibration experiment was carried out. The results show that the test accuracy and precision of the slug calorimeter are improved greatly. Finally, the wind tunnel test was carried out. The test results show that the repeatability accuracy of the slug calorimeter is less than 3%. The deviation of measurement values from different slug calorimeters is less than 3% in the same fluid field. The deviation of measurement values between the slug calorimeter and the Gardon gage is less than 4% in the same fluid field.
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图 2 传统塞块式量热计结构及其使用方式
Figure 2. Traditional structure and usage method of slug calorimeter
图 7 传统隔热结构RCu-FRP对热流输出的影响
Figure 7. Effects of RCu-FRP on heat flux in the traditional insulating structure
图 8 改进隔热结构RCu-FRP对热流输出的影响
Figure 8. Effects of RCu-FRP on heat flux in the improved insulating structure
图 10 塞块式量热计修正系数分布
Figure 10. Distribution of corrected coefficient of slug calorimeters
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