Abstract
The propagation of acoustic waves from a variable-area duct, such as a throat duct, in the presence of a steady subsonic inlet flow has been studied. The acoustic equations are derived by perturbing the unsteady Euler equations about the steady mean-flow state and are formulated in generalized curvilinear coordinates. These are solved numerically by using a MacCormack-type scheme with spatial fourth-order accuracy to obtain the multidimensional structures of the sound fields. The present results show that the directivity of the sound pressure level at the far field is influenced by the duct geometry and that the nonuniform throat flow reduces the acoustic energy.
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