液氦流动速度对温度测量的影响

当测量液体或气体流动时的温度时，温度计所测得的温度为流体的滞止温度，而不是流体的真实温度。为提高测量精度，需对所测量的温度进行修正才能得到流体的真实温度。通过液氦泵获得不同的液氦流速，来研究它对液氦测量温度的影响。描叙了实验的结果及其理论分析，并给出了如何修正测量温度而得到液氦的真实温度。

INFLUENCE OF THE FLOW VELOCITY OF LIQUID HELIUM ON ITS TEMPERATURE MEASUREMENT

When we measure the temperature of the moving fluids,the measuring device gives their stagnation temperature,not the real temperature of the moving fluids To improve the measurement accuracy,the measured temperature must be modified to get the real temperature The experiments of studying the influence of flow velocity of liquid helium on its temperature measurement were made This paper describes the experiments and the theoretical analysis of the results,and tells us how to correct the measured temperature to get the real temperature of the moving liquid helium