Improvements were made on T. Fukano’s model, and the swept angle’s influence on the broadband noise is considered. It was found that the vortex noise’s sound power varies as the fifth power of the cosine value of swept angle of the blade edge. A model used Gauss distributing formula to calculate the spectrum content of broadband noise is also brought out. The model is more suitable for calculating of A-weighted sound level because the spectrum content is calculated. Experiments were done for validation and good agreement was observed.

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