Influence of Diffuser on the Performance of a Forward Curved Fan
抄録
In order to clarify the influence of the diffuser on the characteristics of a forward curved fan, the
influence of bare ratio and outlet angle on the characteristics of the fan was discussed by the
experiment of the actual fan and the numerical simulation. In the present paper, the mechanism of the
discrete frequency noise generated due to the separated flow of the diffuser is reported. The optimized
bare ratio was in the vicinity of 17 degrees. 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 with the blade passing frequency. The efficient outlet angle existed within 10 degrees
to 15 degree. The diffuser made by the outlet angle contributed for increasing the pressure ratio than
that of the bare ratio. Furthermore, it was clarified that to restrain the separation in the diffuser is
effective for decreasing the fan noise.
雑誌名
長崎大学大学院工学研究科研究報告
巻
42
号
79
ページ
1 - 8
発行年
2012-07
ISSN
18805574
書誌レコードID
AA12601998
著者版フラグ
publisher
出版者
長崎大学大学院工学研究科
出版者別言語
Graduate School of Engineering, Nagasaki University
多翼ファンの性能に及ぼすディフューザの影響
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