2011 軸流ファンの動翼近傍の速度変動現象と騒音の関係

概要

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To clarify the mechanism of noise generation from an low pressure axial flow fan, time fluctuating velocity was measured around the rotor blade, especially near the blade tip, by using a hot-wire sensor from a relative flame of reference fixed to the rotor blade. Two sensors were used to obtain the cross-correlation between velocity fluctuations at the reference point and other deferent locations. The results are summarized as follows. If the flow rate was low and the tip leakage flow became to attach to the following blade, the sound pressure level increased. From the data of the cross-correlation of velocity fluctuation the leakage fluid flew downstream spirally, in which a discrete frequency velocity component with low frequency was predominant. It is possibly considered to be the cause of the noise generation of low frequency band.
一般社団法人日本機械学会の論文
2002-09-20