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Aeroacoustics of a porous plug jet noise suppressorThe aeroacoustics of a porous plug jet noise suppressor was investigated. The predicted flow features of isentropic plug nozzles for different pressure ratios or exit flow Mach numbers, throat areas, ratios of the plug to annular nozzle radii, mass flow rates and the available run times possible with the existing compressed air supply system, are compiled. The dimensions and the coordinates of the contour of typical isentropic external expansion plugs with different exit flow Mach numbers are listed. Design details of the experimental facility and the plug nozzle selected for experimental aeroacoustic studies are reported. The analytical flow prediction by method of characteristics of a conical porous plug nozzles is initiated. The role of the shape, size, and porosity of the plug surface in achieving over a perforated conical plug a nearly isentropic shockfree supersonic flow field which is closely similar to the flow field of a contoured isentropic plug nozzle is examined.
Document ID
19810019346
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Dosanjh, D. S. (Syracuse Univ. NY, United States)
Date Acquired
September 4, 2013
Publication Date
July 1, 1981
Subject Category
Acoustics
Report/Patent Number
NASA-CR-164549
SASR-1
Accession Number
81N27884
Funding Number(s)
CONTRACT_GRANT: NAG1-129
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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