Study on the Flow Fluctuation in the Axial-Flow Fan : Part 1,Spectrum of the Total Pressure Fluctuation on the Flow in the Axial-Flow Fan

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In the present paper, the spectra of total pressure fluctuation of flow for various operating conditions and measuring places are shown. They are obtained by a pick-up of condenser microphone type. These researches have brought the following conclusions : (1) The spectrum of fluctuation consists of the following two parts : i) The component, the frequency of which is (NZ)/60 c/sec or its multiples, where N is the speed of the fan per minute, Z is the number of moving blades, and ii) the component, the frequency range of which is considerably wide, and the magnitude of which is quite indefinite. (2) The first arises from the fan wheel, the second from the disturbance of the flow around the bodies in the fan. (3) The magnitude of the component which has the frequency of (NZ)/60 c/sec is proportional to the square of speed of the fan.
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