1510 はく離せん断乱流中の変動静圧と空力音の同時測定による空力音発生機構の考察(J11-2 流れと音の相関計測,J11 流体関連の騒音と振動)

概要

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Mechanisms of aerodynamic sound generation from a separated turbulent shear flow were studied experimentally with measurements of aerodynamic sound and fluctuating static pressure. Sound source term in the equation of Ribner's dilatation theory was obtained with second time derivative of fluctuating static pressure measured in the separated turbulent shear flow from an edged fence. The authors discussed on spectra and coherence of the aerodynamic sound and the sound source term to identify locations of the sound source and vortex motion contributing to the aerodynamic sound generation. The results suggest that the sound source exists on an early stage of the separated shear flow where vortex rolling-ups occur, and the measurements of fluctuating static-pressure give us useful information on relationship between a sound source caused by vortex motion and aerodynamic sound.
社団法人日本機械学会の論文
2007-09-07