Effects of Atmospheric Irregularities on Sonic‐Boom Propagation
作者:
Allan D. Pierce,
Domenic J. Maglieri,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1972)
卷期:
Volume 51,
issue 2C
页码: 702-721
ISSN:0001-4966
年代: 1972
DOI:10.1121/1.1912904
出版商: Acoustical Society of America
数据来源: AIP
摘要:
A review is given of information obtained in recent years concerning the effects on sonic‐boom signatures of departures of the atmosphere from a perfectly stratified time invariant model. These effects include the observed random variations in boom overpressures from those expected for a stratified atmosphere, the anomalously large and variable rise times, and the occurence of spiked or rounded waveforms rather than the characteristicNwaves. The extent of the variability in data recorded during actual flight tests is summarized in the form of histograms, representing experimentally obtained probability density functions. The physical mechanisms believed to be responsible for the variations and the anomalous features in the signatures are described. These include refraction and subsequent wavefront rippling by turbulence, the possible focusing or defocusing of rays, the formation of caustics, and the phenomenon of wavefront folding, diffraction, and scattering. Recent statistical theories of shock propagation through a turbulent atmosphere proposed by Crow, George and Plotkin, Pierce, Horning, and others are reviewed.
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