Near-field shock formation in noise propagation from a high-power jet aircraft

被引：16
|
作者：
Gee, Kent L. [1 ]
Neilsen, Tracianne B. [1 ]
Downing, J. Micah [2 ]
James, Michael M. [2 ]
McKinley, Richard L. [3 ]
McKinley, Robert C. [3 ]
Wall, Alan T. [1 ]
机构：
[1] Brigham Young Univ, Dept Phys & Astron, Provo, UT 84602 USA
[2] Blue Ridge Res & Consulting LLC, Asheville, NC 28801 USA
[3] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA
来源：
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA | 2013年 / 133卷 / 02期
关键词：
CRACKLE;
D O I：
10.1121/1.4773225
中图分类号：
O42 [声学];
学科分类号：
070206 ; 082403 ;
摘要：
Noise measurements near the F-35A Joint Strike Fighter at military power are analyzed via spatial maps of overall and band pressure levels and skewness. Relative constancy of the pressure waveform skewness reveals that waveform asymmetry, characteristic of supersonic jets, is a source phenomenon originating farther upstream than the maximum overall level. Conversely, growth of the skewness of the time derivative with distance indicates that acoustic shocks largely form through the course of near-field propagation and are not generated explicitly by a source mechanism. These results potentially counter previous arguments that jet "crackle" is a source phenomenon. (C) 2013 Acoustical Society of America
引用
收藏
页码：EL88 / EL93
页数：6
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