Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/6629
Title: Flow noise from spoilers in ducts
Authors: Mak, CM 
Wu, J
Ye, C
Yang, J
Issue Date: Jun-2009
Source: Journal of the Acoustical Society of America, June 2009, v. 125, no. 6, p. 3756–3765
Abstract: Measurements of flownoise produced by strip spoilers in the air duct of a ventilation system and radiated from an open exhaust termination unit into a reverberation chamber have been made. The results agree with the previous work of Nelson and Morfey [J. Sound Vib.79, 263–289 (1981)]. Prediction of flownoise produced by multiple spoilers requires the values of the ratio of the mean drag forces that act on the spoilers, the phase relationship between the fluctuating drag forces that act on the spoilers, and the coherence function of the noise sources. The latter is empirically derived from the measured results, where the predicted results agree well with the experimental results within 3dB at most frequencies except for very high frequencies.
Keywords: Reverberation
Ventilation
Ventilation exhausts
Publisher: Acoustical Society of America
Journal: Journal of the Acoustical Society of America 
ISSN: 0001-4966
EISSN: 1520-8524
DOI: 10.1121/1.3127129
Rights: Copyright 2009 Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America.
The following article appeared in Mak, C. M., Wu, J., Ye, C., & Yang, J. (2009). Flow noise from spoilers in ducts. Journal of the Acoustical Society of America, 125(6), 3756-3765 and may be found at http://scitation.aip.org/content/asa/journal/jasa/125/6/10.1121/1.3127129.
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