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For a rotating blade, classical theories of trailing edge noise neglect the blade acceleration; this assumption is thought to be valid when the frequency of the source is large compared to the angular velocity of the blade. This paper suggests that this assumption is more widely applicable. Acceleration is found to have a negligible effect on the average power spectral density even at low frequencies. This result is obtained by comparing the classical approach to two analytical formulations that take into account the acceleration of the blade. The formulations are applied to two model blade elements that are representative of a typical propeller at cruise and during take-off. An explanation for why the acceleration can be neglected at low frequencies is proposed.

On the effect of acceleration on trailing edge noise radiation from rotating blades