Acoustic intensity near a high-powered military jet aircraft | Zendy

Trevor A. Stout | Zendy; Kent L. Gee | Zendy; Tracianne B. Neilsen | Zendy; Alan T. Wall | Zendy; Michael M. James | Zendy

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Acoustic intensity near a high-powered military jet aircraft

Author(s) -

Trevor A. Stout,

Kent L. Gee,

Tracianne B. Neilsen,

Alan T. Wall,

Michael M. James

Publication year - 2015

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 - 10.1121/1.4921746

Subject(s) - intensity (physics) , jet (fluid) , acoustics , physics , near and far field , optics , radiation , mechanics

The spatial variation in vector acoustic intensity has been calculated between 100 and 3000 Hz near a high-performance military aircraft. With one engine of a tethered F-22A Raptor operating at military power, a tetrahedral intensity probe was moved to 27 locations in the geometric near and mid-fields to obtain the frequency-dependent intensity vector field. The angles of the maximum intensity region rotate from aft to sideline with increasing frequency, becoming less directional above 800 Hz. Between 100 and 400 Hz, which are principal radiation frequencies, the ray-traced dominant source region rapidly contracts and moves upstream, approaching nearly constant behavior by 1000 Hz.

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