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A Computational and Experimental Study of Slit ResonatorsComputational and experimental studies are carried out to offer validation of the results obtained from direct numerical simulation (DNS) of the flow and acoustic fields of slit resonators. The test cases include slits with 90-degree corners and slits with 45-degree bevel angle housed inside an acoustic impedance tube. Three slit widths are used. Six frequencies from 0.5 to 3.0 kHz are chosen. Good agreement is found between computed and measured reflection factors. In addition, incident sound waves having white noise spectrum and a prescribed pseudo-random noise spectrum are used in subsequent series of tests. The computed broadband results are again found to agree well with experimental data. It is believed the present results provide strong support that DNS can eventually be a useful and accurate prediction tool for liner aeroacoustics. The usage of DNS as a design tool is discussed and illustrated by a simple example.
Document ID
20030064967
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Tam, C. K. W. (Florida State Univ. Tallahassee, FL, United States)
Ju, H. (Florida State Univ. Tallahassee, FL, United States)
Jones, M. G. (NASA Langley Research Center Hampton, VA, United States)
Watson, W. R. (NASA Langley Research Center Hampton, VA, United States)
Parrott, T. L. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2003
Subject Category
Acoustics
Report/Patent Number
AIAA Paper 2003-3310
Meeting Information
Meeting: 9th AIAA/CEAS Aeroacoustics Conference and Exhibit
Location: Hilton Head, SC
Country: United States
Start Date: May 12, 2003
End Date: May 14, 2003
Sponsors: American Inst. of Aeronautics and Astronautics, National Oceanic and Atmospheric Administration
Distribution Limits
Public
Copyright
Public Use Permitted.

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