首页   按字顺浏览 期刊浏览 卷期浏览 Sonic Boom Propagation in an Unsteady Atmosphere
Sonic Boom Propagation in an Unsteady Atmosphere

 

作者: Allan D. Pierce,   Dominic J. Maglieri,  

 

期刊: The Journal of the Acoustical Society of America  (AIP Available online 1971)
卷期: Volume 49, issue 1A  

页码: 72-72

 

ISSN:0001-4966

 

年代: 1971

 

DOI:10.1121/1.1975941

 

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 of atmospheric unsteadiness on sonic boom signatures. These effects include the observed random variations in boom overpressures from those expected for a stratified atmosphere, the anomalously large and variable risetimes, and the occurrence 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, and diffraction. Recent statistical theories of shock propagation through a turbulent atmosphere proposed by Crow, Plotkin and by George, Pierce, and Horning are reviewed.

 

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