NDLI: Aeroacoustics of supersonic elliptic jets

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Aeroacoustics of supersonic elliptic jets

Content Provider	NASA Technical Reports Server (NTRS)
Author	Georgiadis, Nicholas J. Khavaran, Abbas
Organization	The National Aeronautics and Space Administration (NASA)
Copyright Year	1996
Abstract	The sound field due to a supersonic elliptic jet is studied by direct integration of the propagation equations. Aerodynamic predictions are based on numerical solution to the compressible Navier-Stokes equations in conservative law form, with a k-epsilon turbulence model. In the high frequency limit, the sound field is described by eigenrays that link the source of noise to an observer in the far-field. We assume that noise is dominated by fine-scale turbulence. Using methods derived from acoustic analogy, source correlation terms are simplified and a model is derived that relates jet noise intensity to the 7/2 power of turbulence kinetic energy. Local characteristics of the source such as its strength, time- or length-scale, and convection velocity are derived from mean flow predictions. Numerical results are compared with data for a Mach 1.5 elliptic jet as well as for a round jet. The study suggests that three-dimensional directivity of noise for jets of arbitrary geometry may be predicted with reasonable accuracy when refraction by mean flow gradients is properly accounted for.
File Size	896145
File Format	PDF
Alternate Webpage(s)	http://www.archive.org/details/nasa_techdoc_19960014839
Archival Resource Key	ark:/13960/t0ns1mx9w
Language	English
Publisher Date	1996-01-01
Publisher Institution	Glenn Research Center
Access Restriction	Open
Subject Keyword	Engine Monitoring Instruments Engine Tests Expert Systems Fault Detection Ground Tests Systems Health Monitoring Anomalies Real Time Operation Space Shuttle Main Engine Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text

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