Self-Excitation of Small Plate Impingement Tones from Flat Plates with and without Coaxial Hole
Publication: Journal of Aerospace Engineering
Volume 27, Issue 4
Abstract
Experiments are carried out to study the self-excitation of axisymmetric underexpanded sonic impinging jets on flat plates with and without coaxial hole. Feedback studies indicate that the self-excitation of secondary small plate impingement tones () involves an acoustic feedback to the nozzle. The role of an acoustic feedback to the nozzle in the self-excitation of primary small plate impingement tone () depends on the impinging plate diameter. The frequency of small plate tones (both and ) from plate with coaxial hole of diameter is less than the plate without hole for the same nozzle pressure ratio (NPR) and nozzle-plate spacing. Small plate impingement tones ( and ) are suppressed in the case of plate with coaxial hole of diameter .
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Published In
Journal of Aerospace Engineering
Volume 27 • Issue 4 • July 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Aug 7, 2012
Accepted: Nov 27, 2012
Published online: Nov 29, 2012
Published in print: Jul 1, 2014
Discussion open until: Sep 29, 2014
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