1102 多翼ファンの空力騒音に及ぼすディフューザの影響

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  • 1102 Influence of Diffuser on Aerodynamic Noise of a Forward Curved Fan

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In order to clarify the influence of diffuser on the characteristics of a forward curved fan, the influence of bare ratio and outlet angle on the characteristics of the fen was analyzed by the experiment of the actual fen and the numerical simulation. In this study, the mechanism of the discrete frequency noise generated due to the separated flow of the diffuser is discussed. The optimized bare ratio was in the vicinity of 17°. The fan separated inside of the diffuser generated the discrete frequency noise due to interaction between the reversed flow from the diffuser and the impeller rotating at the blade passing frequency. The efficient outlet angle existed within 10° to 15°. The diffuser made by the outlet angle contributed for increasing the pressure ratio than that of the bare ratio. Furthermore, we clarified that to restrain the separation in the diffuser is effective for decreasing the fen noise.

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