资料来源: 里卡多梅希亚-阿尔瓦雷斯和 Hussam Hikmat, 密歇根州立大学机械工程系, 东兰辛, MI

热线风速有很短的时间响应, 这使他们的理想测量迅速波动的现象, 如湍流流。本实验的目的是演示热丝测速的使用。

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实验测量结果列在表2中, 如图 5所示。这些数据的线性回归为等式 (6) 产生了以下结果:

(9)

它可以用来确定速度作为电压的函数:

(10)

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由于湍流表现出高频速度波动, 热线风速是适合其特性的仪器, 因为它们具有很高的时间分辨率。在本实验中, 我们演示了校准热线风速仪的过程。为此, 我们比较了风速计的电压信号与已知的速度值在腔 contracta的特征射流。这些测量用于确定风速计线性响应的校准常数。

热线测速在风洞边界层流动的科学研究中得到了广泛的应用。边界层是流体力学中最古老的研究课?...

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