Abstract
A model for predicting noise of propeller fans has been developed experimentally. First, the frequency response of turbulence on the blade of a rotating propeller fan was experimentally measured. Then, propeller fan noise was predicted by this model, which calculates lift fluctuations by Sears's equation and sound pressure in the far field by Curie's equation. The model assumes that the normalized intensity of turbulence (i.e., velocity fluctuation) is small in the high-flow-coefficient range but increases sharply in the low-flow-coefficient range. And the model showed that propeller fan noise depends on averaged relative velocity, intensity of turbulence, and length scale of turbulence. These results agree with the experimental measurements. Accordingly, the model predicts propeller fan noise and noise spectrum over a wide range of flow coefficients with reasonable accuracy.
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