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Suppression of background noise in a transonic wind-tunnel test sectionSome exploratory tests were recently performed in the transonic test section of the NASA Marshall Space Flight Center 14-in. wind tunnel to suppress the background noise. In these tests, the perforated walls of the test section were covered with fine wire screens. The screens eliminated the edge tones generated by the holes in the perforated walls and significantly reduced the tunnel background noise. The tunnel noise levels were reduced to such a degree by this simple modification at Mach numbers 0.75, 0.9, 1.1, 1.2, and 1.46 that the fluctuating pressure levels of a turbulent boundary layer could be measured on a 5-deg half-angle cone.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Schutzenhofer, L. A.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Howard, P. W.
(NASA Marshall Space Flight Center Systems Dynamics Laboratory, Huntsville, Ala., United States)
Date Acquired
August 8, 2013
Publication Date
November 1, 1975
Publication Information
Publication: AIAA Journal
Volume: 13
Subject Category
Research And Support Facilities (Air)
Accession Number
Distribution Limits

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