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Acoustic Evaluation Of The Helmholtz Resonator Treatment In The Nasa Lewis 8 By 6 Foot Supersonic Wind Tunnel
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Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781725062825 Total Pages :30 pages Book Rating :4.0/5 (628 download)
Book Synopsis Acoustic Evaluation of the Helmholtz Resonator Treatment in the NASA Lewis 8- By 6-Foot Supersonic Wind Tunnel by : National Aeronautics and Space Administration (NASA)
Download or read book Acoustic Evaluation of the Helmholtz Resonator Treatment in the NASA Lewis 8- By 6-Foot Supersonic Wind Tunnel written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-10 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: The acoustic consequences of sealing the Helmholtz resonators of the NASA Lewis 8- by 6-Foot Supersonic Wind Tunnel (8x6 SWT) were experimentally evaluated. This resonator sealing was proposed in order to avoid entrapment of hydrogen during tests of advanced hydrogen-fueled engines. The resonators were designed to absorb energy in the 4- to 20-Hz range; thus, this investigation is primarily concerned with infrasound. Limited internal and external noise measurements were made at tunnel Mach numbers ranging from 0.5 to 2.0. Although the resonators were part of the acoustic treatment installed because of a community noise problem their sealing did not seem to indicate a reoccurrence of the problem would result. Two factors were key to this conclusion: (1) A large bulk treatment muffler downstream of the resonators was able to make up for much of the attenuation originally provided by the resonators, and (2) there was no noise source in the tunnel test section. The previous community noise problem occurred when a large ramjet was tested in an open-loop tunnel configuration. If a propulsion system producing high noise levels at frequencies of less than 10 Hz were tested, the conclusion on community noise would have to be reevaluated. Heidelberg, Laurence J. and Gordon, Elliot B. Glenn Research Center NASA-TM-101407, E-4147, NAS 1.15:101407 RTOP 535-03-01...
Book Synopsis Acoustic Evaluation of the Helmholtz Resonator Treatment in the NASA Lewis 8- by 6-foot Supersonic Wind Tunnel by :
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Book Synopsis Acoustical Treatment for the NACA 8- by 6-foot Supersonic Propulsion Wind Tunnel by : Leo L. Beranek
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