Flow noise from spoilers in ducts

Mak, Cheuk Ming; Wu, Jia; Ye, Chao; Yang, Jun

doi:doi:10.1121/1.3127129

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Journal of the Acoustical Society of America / Volume 125 / Issue 6 / NOISE: ITS EFFECTS AND CONTROL [50]

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Flow noise from spoilers in ducts

J. Acoust. Soc. Am. Volume 125, Issue 6, pp. 3756-3765 (2009); (10 pages)

Cheuk Ming Mak¹, Jia Wu¹, Chao Ye², and Jun Yang³

¹Department of Building Services Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
²Department of Building Services Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China and State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100080, China
³State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100080, China

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Abstract

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Measurements of flow noise 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 flow noise 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 3 dB at most frequencies except for very high frequencies.

ACKNOWLEDGMENTS

The work described in this paper was fully supported by a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China (Project No. PolyU 5229/05E).

Article Outline

INTRODUCTION
THEORY AND PREDICTIVE EQUATIONS OF NOISE PRODUCED BY IN-DUCT FLOW SPOILER(S)
EXPERIMENTAL PROCEDURE
1. Design of the experimental rig
2. The spoilers used in the experiment
3. Airflow measurements
4. Acoustic measurements
5. Force measurements
ANALYSIS AND DISCUSSION OF THE RESULTS
1. Normalization of the experimental results for a single flow spoiler
2. Determination of the coherence function of noise sources
3. Comparison between predicted and measured results
CONCLUSION

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KEYWORDS and PACS

Keywords

acoustic noise measurement, aeroacoustics, drag, exhaust systems, pipe flow, ventilation

PACS

43.50.Nm

Aerodynamic and jet noise
43.50.Ed

Noise generation
43.50.Cb

Noise spectra, determination of sound power
43.28.Ra

Generation of sound by fluid flow, aerodynamic sound and turbulence

ARTICLE DATA

History

Received 17 Apr 2008
Accepted 10 Apr 2009
Revised 28 Mar 2009

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http://dx.doi.org/10.1121/1.3127129

PUBLICATION DATA

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0001-4966 (print)

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$abstract.society.value is a Member of CrossRef

Acoustical Society of America

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Flow noise from spoilers in ducts