Model experiment to study sonic boom propagation through turbulence. Part II. Effect of turbulence intensity and propagation distance through turbulence.
Model experiment to study sonic boom propagation through turbulence. Part II. Effect of turbulence intensity and propagation distance through turbulence.
复制标题
研究音爆通过湍流传播的模型实验。
DOI：
10.1121/1.424339
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
D. Blackstock
中科院分区：
文献类型：
--
作者：
B. Lipkens;D. Blackstock
据报道，模型实验成功地模拟了音爆在湍流大气中的传播[B. Lipkens 和 D. T. Blackstock，J. Acoust。苏克。是。 103, 148-158 (1998)]。在这项研究中，研究了湍流强度和湍流传播距离对 N 波特性的影响。感兴趣的主要参数是上升时间和峰值压力。湍流强度和传播距离的作用是使上升时间和峰值压力分布变得平坦。通过湍流传播后，上升时间和峰值压力分布始终具有正偏度。平均上升时间随着湍流强度和传播距离的增加而增长。上升时间数据的分散是单方面的，即上升时间几乎总是因湍流而增加。平均峰值压力随着湍流强度和传播距离缓慢降低。对于报告的数据，观察到平均上升时间增加了三倍，平均峰值压力最大减少了约 20%。观察到上升时间是无湍流值的十倍以上。通过湍流传播后，最大峰值压力至多增加一倍，最小峰值压力值约为无湍流值的一半。圆角波形总是比尖峰波形更常见。
A model experiment was reported to be successful in simulating the propagation of sonic booms through a turbulent atmosphere [B. Lipkens and D. T. Blackstock, J. Acoust. Soc. Am. 103, 148-158 (1998)]. In this study the effect on N wave characteristics of turbulence intensity and propagation distance through turbulence are investigated. The main parameters of interest are the rise time and the peak pressure. The effect of turbulence intensity and propagation distance is to flatten the rise time and peak pressure distributions. Rise time and peak pressure distributions always have positive skewness after propagation through turbulence. Average rise time grows with turbulence intensity and propagation distance. The scattering of rise time data is one-sided, i.e., rise times are almost always increased by turbulence. Average peak pressure decreases slowly with turbulence intensity and propagation distance. For the reported data a threefold increase in average rise time is observed and a maximum decrease of about 20% in average peak pressure. Rise times more than ten times that of the no turbulence value are observed. At most, the maximum peak pressure doubles after propagation through turbulence, and the minimum peak pressure values are about one-half the no-turbulence values. Rounded waveforms are always more common than peaked waveforms.