564 翼形遠心送風機の低騒音化 : 舌部付近の流れと圧力変動

概要

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The present study intended that clarification of generating mechanism of blade passing frequency (BPF) noise in wing profile centrifugal blower. First, flow in the vicinity of cut-off in generation source of BPF noise visualized brought out relation between blade passing and flow. Next, probe microphone measured fluctuating pressure source of BPF noise in cut-off surface. Distribution of fluctuating pressure pinpointed major source of BPF noise. Measurement of wind position just as fluctuating pressure brought out relation between blade passing and fluctuating pressure.
2009-08-03