102 高速PIVを用いた流れ場と空力音の実験的評価法(空力騒音の解析)

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  • 102 Experimental Evaluation of Flow Field and Aeroacoustic Sound using Time-resolved PIV

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It is difficult to clarify the mechanism of the generation of aeroacoustic sound experimentally because unsteady behavior of the spatial distribution of vorticity need to be measured precisely. Using time-resolved Particle Image Velocimetry, we conducted the experiment to measure the flow field and aeroacoustic sound around a cylinder simultaneously. From the temporal data obtained by PIV, we calculated the spatial distribution of vorticity and estimated the sound pressure in the far field, applying Howe's vortex sound theory. Through comparison with the actual sound pressure measured by a microphone, it is assured that PIV estimated sound pressure is correlative with the actual sound pressure.

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