Abstract
A model is proposed to predict the amplitude of sound generated by an edgetone. The edgetone configuration under consideration consists of a flat plate located in the medial plane of a fully developed two-dimensional jet. The flow is modeled as follows. A periodic disturbance at the jet origin leads to the formation of an asymmetric vortex street which propagates downstream with a fixed convection velocity and wavelength. The vortex strength, convection velocity, and wavelength are determined as functions of the Strouhal number by applying conservation laws and kinematic relationships. The farfield acoustic pressure is calculated from a potential flow estimate of the periodic force on the edge. Predicted sound pressures are compared with experimental results and found to be in reasonable agreement.
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