NDLI: Screech noise generation from supersonic underexpanded jets investigated

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Screech noise generation from supersonic underexpanded jets investigated

Content Provider	NASA Technical Reports Server (NTRS)
Author	Seasholtz, Richard G. Panda, Jayanta
Copyright Year	2000
Description	Many supersonic military aircraft and some of the modern civilian aircraft (such as the Boeing 777) produce shock-associated noise. This noise is generated from the jet engine plume when the engine nozzle is operated beyond the subsonic operation limit to gain additional thrust. At these underexpanded conditions, a series of shock waves appear in the plume. The turbulent vortices present in the jet interact with the shock waves and produce the additional shock-associated noise. Screech belongs to this noise category, where sound is generated in single or multiple pure tones. The high dynamic load associated with screech can damage the tailplane. One purpose of this study at the NASA Glenn Research Center at Lewis Field was to provide an accurate data base for validating various computational fluid dynamics (CFD) codes. These codes will be used to predict the frequency and amplitude of screech tones. A second purpose was to advance the fundamental physical understanding of how shock-turbulence interactions generate sound. Previously, experiments on shock-turbulence interaction were impossible to perform because no suitable technique was available. As one part of this program, an optical Rayleigh-scattering measurement technique was devised to overcome this difficulty.
File Size	125192
File Format	PDF
Language	English
Publisher Date	2000-03-01
Access Restriction	Open
Subject Keyword	Acoustics Shock Waves Turbulence Supersonic Aircraft Screech Tones Supersonic Jet Flow Aerodynamic Noise Noise Generators Boeing 777 Aircraft Plumes Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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