Asymptotic Approximations for the Sound Generated by Aerofoils in Unsteady Subsonic Flows

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The study explores sound generation by solid bodies in steady subsonic flows affected by unsteady perturbations, emphasizing noise from aircraft engine blades. It presents asymptotic approximation solutions using advanced analytical techniques, including the Wiener-Hopf method and matched asymptotic expansion. These methods enable quicker analysis of how changes in steady flow or blade shape impact noise, offering a more efficient alternative to numerical or experimental approaches.