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Investigating the Feedback Path in a Jet-Surface Resonant InteractionA resonant interaction between an 8:1 aspect ratio rectangular jet and flat-plates, placed parallel to the jet, is addressed in this study. For certain relative locations of the plates, the resonance takes place with accompanying audible tones. Even when the tone is not audible the sound pressure level spectra is often marked by conspicuous peaks. The frequencies of the spectral peaks, as functions of the streamwise length of the plate and its relative location to the jet as well as the jet Mach number, are explored in an effort of understand the flow mechanism. It is demonstrated that the tones are not due to a simple feedback between the plates trailing edge and the nozzle exit; the leading edge also comes into play in determining the frequency. An acoustic feedback path, involving diffraction from the leading edge, appears to explain the frequencies of some of the spectral peaks.
Document ID
Acquisition Source
Glenn Research Center
Document Type
Zaman, Khairul
(NASA Glenn Research Center Cleveland, OH United States)
Fagan, Amy
(NASA Glenn Research Center Cleveland, OH United States)
Bridges, James
(NASA Glenn Research Center Cleveland, OH United States)
Brown, Cliff
(NASA Glenn Research Center Cleveland, OH United States)
Date Acquired
January 5, 2016
Publication Date
November 20, 2015
Subject Category
Report/Patent Number
AIAA Paper 2015-2999
Meeting Information
Meeting: Ohio State University Graduate Seminar
Location: Columbus, OH
Country: United States
Start Date: November 20, 2015
Sponsors: American Inst. of Aeronautics and Astronautics
Funding Number(s)
WBS: WBS 475122.
Distribution Limits
Work of the US Gov. Public Use Permitted.
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