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Characteristics of an anechoic chamber for fan noise testingAcoustical and mechanical design features of NASA Lewis Research Center's engine fan noise facility are described. Acoustic evaluation of the chamber, which is lined with an array of stepped wedges, is described. Results from the evaluation in terms of cut-off frequency and non-anechoic areas near the walls are detailed. Fan models are electrically driven to 20,600 RPM in either the inlet mode or exhaust mode to facilitate study of both fore and aft fan noise. Inlet noise characteristics of the first fan tested are discussed and compared to full-scale levels. Turbulence properties of the inlet flow and acoustic results are compared with and without a turbulence reducing screen over the fan inlet.
Document ID
19770011224
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Wuzyniak, J. A. (NASA Lewis Research Center Cleveland, OH, United States)
Shaw, L. M. (NASA Lewis Research Center Cleveland, OH, United States)
Essary, J. D. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 3, 2013
Publication Date
January 1, 1977
Subject Category
Research And Support Facilities (Air)
Report/Patent Number
NASA-TM-X-73555
E-8993
Meeting Information
Meeting: Intern. Gas Turbine Conf.
Location: Philadelphia
Start Date: March 25, 1977
End Date: March 30, 1977
Sponsors: Am. Soc. of Mech. Engrs.
Accession Number
77N18168
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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