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A Study of Standing Pressure Waves Within Open and Closed Acoustic ResonatorsThe first section of the results presented herein was conducted on an axisymmetric resonator configured with open ventilation ports on either end of the resonator, but otherwise closed and free from obstruction. The remaining section presents the results of a similar resonator shape that was closed, but contained an axisymmetric blockage centrally located through the axis of the resonator. Ambient air was used as the working fluid. In each of the studies, the resonator was oscillated at the resonant frequency of the fluid contained within the cavity while the dynamic pressure, static pressure, and temperature of the fluid were recorded at both ends of the resonator. The baseline results showed a marked reduction in the amplitude of the dynamic pressure waveforms over previous studies due to the use of air instead of refrigerant as the working fluid. A sharp reduction in the amplitude of the acoustic pressure waves was expected and recorded when the configuration of the resonators was modified from closed to open. A change in the resonant frequency was recorded when blockages of differing geometries were used in the closed resonator, while acoustic pressure amplitudes varied little from baseline measurements.
Document ID
20110022626
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Authors
Daniels, C.
(Ohio Aerospace Inst. Cleveland, OH, United States)
Steinetz, B.
(NASA Glenn Research Center Cleveland, OH, United States)
Finkbeiner, J.
(Illinois Inst. of Tech. Chicago, IL, United States)
Raman, G.
(Illinois Inst. of Tech. Chicago, IL, United States)
Li, X.
(Illinois Inst. of Tech. Chicago, IL, United States)
Date Acquired
August 25, 2013
Publication Date
December 2, 2002
Subject Category
Acoustics
Meeting Information
Meeting: 145th Acoustic Society of America Conference
Location: Cancun
Country: Mexico
Start Date: December 2, 2002
End Date: December 6, 2002
Funding Number(s)
CONTRACT_GRANT: NCC3-840
Distribution Limits
Public
Copyright
Public Use Permitted.
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