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Reynolds number effects on flow/acoustic mechanisms in spherical windscreens
Zheng, Zhongquan Charlie Tan, Bee K.
Zheng, Zhongquan Charlie
Tan, Bee K.
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Abstract
There is a practical need to fully understand the mechanisms involved in the flow/pressure fluctuations around a screened microphone. A stream of uniform flow with low-frequency turbulence encountering a rigid, impermeable spherical windscreen is considered in this study. Pressure distributions on the surface of the sphere are determined by the flow structure. Pressure fluctuations at the center of the sphere are then calculated based on the integration of surfacepressure distributions. Because of the low-frequency assumption, results from steady-state laminar flows can be used to investigate the Reynolds numbereffects on wind noise reduction. Three types of flow have been studied in this paper: an inviscid case, a low-Reynolds-number Stokes flow, and intermediate- and high-Reynolds-number flows. A Reynolds-number/wind-noise-reduction correlation shows that the wind noise reduction increases with decreasing Reynolds number.
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This is the published version. Copyright 2003 Acoustical Society of America
Date
2003
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Acoustical Society of America
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Keywords
Reynolds stress modeling, Stokes flows, Aerodynamic noise, Inviscid laminar flows, Laminar flows
Citation
Zheng, Z. Charlie, and Bee K. Tan. "Reynolds Number Effects on Flow/acoustic Mechanisms in Spherical Windscreens." The Journal of the Acoustical Society of America J. Acoust. Soc. Am. 113.1 (2003): 161. http://dx.doi.org/10.1121/1.1527927