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Near Field Pressure Fluctuations in the Exit Plane of a Choked Axisymmetric NozzleNearfield pressure data are presented for an unheated jet issuing from an underexpanded sonic nozzle for two exit lip thicknesses of 0.200 and 0.625 nozzle diameters. Fluctuating measurements were obtained on the nozzle exit surface as well as in the acoustic nearfield. Narrowband spectra are presented for numerous operating conditions expressed in terms of the fully expanded Mach number based on nozzle pressure ratio.
Document ID
19980007542
Acquisition Source
Langley Research Center
Document Type
Technical Memorandum (TM)
Authors
Ponton, Michael K. (NASA Langley Research Center Hampton, VA United States)
Seiner, John M. (NASA Langley Research Center Hampton, VA United States)
Brown, Martha C. (NASA Langley Research Center Hampton, VA United States)
Date Acquired
September 6, 2013
Publication Date
November 1, 1997
Subject Category
Acoustics
Report/Patent Number
NASA-TM-113137
NAS 1.15:113137
Report Number: NASA-TM-113137
Report Number: NAS 1.15:113137
Funding Number(s)
PROJECT: RTOP 537-05-21-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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