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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Statistical properties of spherical shock waves propagating through grid turbulence, turbulent cylinder wake, and laminar flow
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Statistical properties of spherical shock waves propagating through grid turbulence, turbulent cylinder wake, and laminar flow

机译：通过栅格湍流传播的球面冲击波的统计特性，湍流缸唤醒和层流

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摘要

Wind tunnel experiments are reported for a spherical shock wave propagating through turbulent wakes of a single cylinder, double cylinders, grid-turbulence, and a laminar flow, whose influences on the shock wave are compared. Overpressure behind the shock wave is measured on a plate while stream-wise velocity is measured at the flow point between the measurement plate and the location of the shock wave ejection. Average of peak-overpressure observed upon arrival of the shock wave is decreased by the mean velocity defect of the cylinder wake. Root mean squared (rms) peak-overpressure fluctuation divided by the averaged peak-overpressure is increased by turbulence, and it becomes larger with the rms velocity fluctuation. Correlation coefficients are calculated between fluctuations of peak-overpressure and low-pass filtered fluid velocity. The strong positive correlation is found for the fluid at the location where the shock ray toward the pressure measurement point passes. The length scale of velocity fluctuation with the strong correlation is related to the integral length scale of turbulence. In the double-cylinder wake experiments, the shock wave that has passed one cylinder wake interacts again with another cylinder wake before it reaches the measurement plate. The correlation coefficient for the velocity fluctuation of the first wake is weakened by the second wake, and this influence becomes more important when the rms velocity fluctuation of the second wake is larger.
机译：据报道，通过单个汽缸，双缸，电网湍流和层流的湍流唤醒传播的球形冲击波，比较对冲击波的影响。在盘中的超压在板上测量，而在测量板之间的流量点和冲击波喷射的位置处测量流速度的速度。通过汽缸唤醒的平均速度缺陷降低时观察到的峰值过压的平均值。通过湍流增加了由平均峰 - 过压除以平均峰值超压的根平均平方（RMS）峰值过压波动，并且随着RMS速度波动变大。峰值过压和低通滤波流体速度波动之间计算相关系数。发现了对压力测量点的冲击射线的位置处的流体的强正相关。具有强相关性的速度波动的长度比与湍流的整体长度比例有关。在双缸唤醒实验中，通过一个气缸唤醒的冲击波再次与另一个气缸唤醒在到达测量板之前再次相互作用。第二次唤醒削弱了第一尾脉冲波动的相关系数，并且当第二次唤醒的速率波动较大时，这种影响变得更加重要。

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