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

Kent L. Gee | Zendy; Tracianne B. Neilsen | Zendy; J. Micah Downing | Zendy; Michael M. James | Zendy; Richard L. McKinley | Zendy; Robert C. McKinley | Zendy; Alan T. Wall | Zendy

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

Author(s) -

Kent L. Gee,

Tracianne B. Neilsen,

J. Micah Downing,

Michael M. James,

Richard L. McKinley,

Robert C. McKinley,

Alan T. Wall

Publication year - 2013

Publication title -

the journal of the acoustical society of america

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.619

H-Index - 187

eISSN - 1520-8524

pISSN - 0001-4966

DOI - 10.1121/1.4773225

Subject(s) - jet (fluid) , skewness , waveform , shock (circulatory) , noise (video) , supersonic speed , physics , acoustics , source field , power (physics) , mechanics , near and far field , optics , computer science , mathematics , medicine , statistics , quantum mechanics , voltage , artificial intelligence , image (mathematics)

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.

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