Abstract
A numerical analysis is developed for sound radiation from cylindrical ducts. The structure of the radiated field is numerically obtained for unflanged, flanged, and horned-type ducts, including the effect of mean flow field. The governing equation for acoustic disturbances is a linearized unsteady Euler equation about a steady compressible mean flow. The numerical simulation is conducted by a fourth-order accurate finite difference scheme. The present result for the reflection coefficient shows good agreement with the experiment and available theory. The results also show that a nonuniform mean flow reduces the sound pressure level, although this is not valid for a uniform mean flow.
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