NDLI: Response of multi-panel assembly to noise from a jet in forward motion

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Response of multi-panel assembly to noise from a jet in forward motion

Content Provider	NASA Technical Reports Server (NTRS)
Author	Fenno Jr., C. C. Maestrello, L. Bayliss, A. McGreevy, J. L.
Copyright Year	1995
Description	A model of the interaction of the noise from a spreading subsonic jet with a 4 panel assembly is studied numerically in two dimensions. The effect of forward motion of the jet is accounted for by considering a uniform flow field superimposed on a mean jet exit profile. The jet is initially excited by a pulse-like source inserted into the flow field. The pulse triggers instabilities associated with the inviscid instability of the jet shear layer. These instabilities generate sound which in turn serves to excite the panels. We compare the sound from the jet, the responses of the panels and the resulting acoustic radiation for the static jet and the jet in forward motion. The far field acoustic radiation, the panel response and sound radiated from the panels are all computed and compared to computations of a static jet. The results demonstrate that for a jet in forward motion there is a reduction in sound in downstream directions and an increase in sound in upstream directions in agreement with experiments. Furthermore, the panel response and radiation for a jet in forward motion exhibits a downstream attenuation as compared with the static case.
File Size	1296281
Page Count	32
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19950022252
Archival Resource Key	ark:/13960/t56f0s82k
Language	English
Publisher Date	1995-05-01
Access Restriction	Open
Subject Keyword	Fluid Mechanics And Heat Transfer Panels Nonlinear Equations Jet Flow Jet Aircraft Noise Shock Wave Interaction Aerodynamic Noise Sound Intensity Shear Layers Subsonic Flow Flow Distribution Mathematical Models Aeroacoustics Noise Prediction Boundary Layer Flow Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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