213 三次元かく乱を導入したはく離せん断乱流の空力音に関する研究(流体工学(3))

概要

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Relations of aerodynamic sound and vortex motions in a flow separated from a fence with vortex generators were discussed by velocity measurements and simultaneous measurements of aerodynamic sound and fluctuating static-pressure. The vortex generators were attached to the fence to introduce three-dimensional perturbations into the separated shear flow. Sound source terms of Ribner's Dilatation theory were calculated with measured fluctuating static-pressure, and integral of coherent output power of the sound source term was discussed to determine flow regions contributing to aerodynamic sound generation. The results suggest that the three-dimensional perturbations reduce aerodynamic sound in relatively low frequency band and the effect of the aerodynamic sound reduction was detected in the separated shear flow near the fence by the integral of coherent output power of the sound source term.
社団法人日本機械学会の論文
2005-10-08