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定程干涉法是精度最高的气相声速测量方法,本文再现了定程干涉法共振频率的导出过程,在此基础上复现了边界层修正式的导出过程。最后以声速数据丰富的Ar为例,分析了边界层对这两种定程干涉法测量的影响规律。结果表明:边界层对定程干涉法声速测量有着显著的影响;边界层的影响随温度升高而增大、随压力升高而降低;适当增加共鸣腔体的几何尺寸有利于减小边界层效应的影响。
The method of distance interferometry is the most accurate method for measuring the gas-phase velocity of sound. This paper reproduces the derivation process of the resonant frequency of the path-interferometry method. On this basis, the derivation of the boundary-layer modified formula is reproduced. Finally, taking the Ar sound-velocity data as an example, the influence of the boundary layer on the measurement of these two kinds of distance interferometry is analyzed. The results show that the boundary layer has a significant effect on the sound velocity measurement of the fixed-bed interferometry. The influence of the boundary layer increases with the increase of temperature and decreases with the increase of the pressure. Appropriately increasing the geometry of the resonance cavity is helpful to reduce the boundary layer Effect of the effect.