Abstract
Noise prediction for turbulent interactions with fan-blades or high-lift devices has been continuously developed for the last thirty years. A benchmark solution to this problem is Amiet's theory for acoustic radiation from an airfoil in a turbulent stream. In most aerodynamic theories the incoming gust is assumed to be sinusoidal, which is also the case for the theory of Amiet. This assumption affects the derivation of the unsteady lift function which is used to propagate the noise to the far-field. This paper proposes to show the effect of altering the shape of the incoming gust by assuming a Gaussian function. This analysis will then be compared to the case of the sinusoidal gust as well as to acoustic measurements of an airfoil placed in a jet taken in the VKI semi-anechoic chamber.
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