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Departments of Aeronautics and Astronautics and Mechanical Engineering
Stanford University
Abstract-
Imperfectly-expanded jets are known to produce intense noise in the form of
screech and broadband shock-associated noise. Flow mechanisms responsible
for this additional noise have been known since the early work of Powell,
but a quatitative understanding has been lacking. In this talk we will
illustrate recent work (jointly with Ted Manning) on noise-generation by
shock-vortex interaction in a supersonic shear layer and show how the key
mechanisms of noise radiation can be isolated by careful numerical
experiments. We study a sequence of related model problems which allows us
to determine the influence of flow parameters on the noise radiation and
reveals that different radiation mechanisms are at play with low and high
amplitudes disturbances in the shear layer.
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