Abstract
In the present paper, the spectra of total pressure fluctuation of the flow at different running states and measuring places are shown. They are obtained a pick-up of condenser microphone type. These researches have concluded the following : (1) The fluctuation spectrum consists of the following two parts : i) The component, the frequency of which is (NZ)/60 c/s or its multiple, where N is speed of the fan per minute, Z is number of moving blades. 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/s is proportional to the square of speed of the fan.
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