1739 遠心送風機におけるBPF音源領域の流量特性(S33-3 送風機・圧縮機,S33 流体機械の諸問題)

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This paper describes the numerical prediction of blade-passing frequency (BPF) sound source distribution in a centrifugal blower with the operating condition. The computational object is overall blower; few reports on numerical analysis are concerned with overall apparatus. The sound source is predicted based on the correlation analysis between the pressure fluctuation on the scroll surface and radiated blower noise. Both fundamental and higher-order BPF sound sources on the casing scroll near the cutoff are distributed within twice the height of impeller exit. In low flow rate operating condition, 1st BPF is distributed on nearly the same region as the design point, while 2nd BPF increases significantly on the downstream area of the cutoff. With this level increase, 2nd BPF component of the pressure fluctuation is also measured on the downstream area of the casing scroll.
2007-09-07