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主要目地是通过改变两根平行的热线间距来研究低速风洞中热线间距对速度梯度测量的影响,并确定最佳间距。实验结果表明当热线间距为3～5柯尔莫哥洛夫尺度时,速度梯度可以通过有限差分方法准确估算出来,并接近各项同性理论值。
The main purpose is to study the influence of the spacing of hot wires in the low speed wind tunnel on the velocity gradient measurement by changing the distance between two parallel hotlines and to determine the optimal spacing. The experimental results show that the velocity gradient can be accurately estimated by the finite difference method and close to the homosexual theoretical values when the distance between the hotlines is 3 to 5 kmols.