Abstract
To clarify the mechanism of noise generation from a low pressure axial flow fan, time fluctuating velocity was measured around the rotor blades, especially near the rotor tip, by using a hot-wire sensor from a relative flame of reference fixed to the rotor blades. Two sensors were used to obtain the cross-correlation between velocity fluctuations at the reference point and other locations. The results are summarized as follows. If the flow rate was lower than the design condition and the tip leakage flow became to attach to the following blade, the sound pressure level was increased. From the cross-correlation of velocity fluctuations the leakage flow 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.
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