NDLI: High speed jet noise research at nasa lewis

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High speed jet noise research at nasa lewis

Content Provider	NASA Technical Reports Server (NTRS)
Author	Krejsa, Eugene A. Cooper, B. A. Kim, C. M. Khavaran Sr., Abbas
Copyright Year	1992
Description	The source noise portion of the High Speed Research Program at NASA LeRC is focused on jet noise reduction. A number of jet noise reduction concepts are being investigated. These include two concepts, the Pratt & Whitney ejector suppressor nozzle and the General Electric (GE) 2D-CD mixer ejector nozzle, that rely on ejectors to entrain significant amounts of ambient air to mix with the engine exhaust to reduce the final exhaust velocity. Another concept, the GE 'Flade Nozzle' uses fan bypass air at takeoff to reduce the mixed exhaust velocity and to create a fluid shield around a mixer suppressor. Additional concepts are being investigated at Georgia Tech Research Institute and at NASA LeRC. These will be discussed in more detail in later figures. Analytical methods for jet noise prediction are also being developed. Efforts in this area include upgrades to the GE MGB jet mixing noise prediction procedure, evaluation of shock noise prediction procedures, and efforts to predict jet noise directly from the unsteady Navier-Stokes equation.
File Size	469276
Page Count	14
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19940028958
Archival Resource Key	ark:/13960/t0bw2d120
Language	English
Publisher Date	1992-04-01
Access Restriction	Open
Subject Keyword	Acoustics Jet Aircraft Noise Noise Reduction Aerodynamic Noise Suppressors Navier-stokes Equation Exhaust Velocity Jet Mixing Flow Ejectors High Speed Entrainment Prediction Analysis Techniques Aeroacoustics Noise Prediction 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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