Studies on the Noise of Axial Flow Fan

概要

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Among the noises of an axial-flow fan with stator and rotor, a discrete noise is most troublesome. This discrete noise is chiefly caused by the interaction between stator and rotor. In this paper we dealt with the axial spacing and the tilting angle in the spanwise direction between guide vane and rotor blades as parameters. Some experiments on the effects of those parameters on noise reduction were made, and at the same time measurements of the pressure fluctuation on the blade surface of the guide vane were carried out. To abate the noise caused by the interference of blades with viscous wakes, we tried to make small the non-univormity of the flow from the inlet cascade by inserting a flow-regulator between the stator and the rotor, and we found that this method is effective for the reduction of the noise. Finally we clarified experimentally that the method of increasing the tilting angle is effective for noise reduction, if the axial spacing bertween the rotor and stator vanes is within a certain range.
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