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11.—The Instability due to Acoustic Radiation striking a Vortex Sheet on a Supersonic Stream*

  • D. S. Jones (a1) and J. D. Morgan (a1)

Synopsis

The propagation of sound across a vortex sheet separating two fluids, with the same density and sound speed, which are in supersonic relative motion is examined for both harmonic and impulsive sources. It is found that instability waves are present when M < 2√2, M being the Mach number, and it is suggested that these may account for the phenomena observed in certain experiments. For M > 2 there are also neutral stability waves and these lie in regions in the supersonic stream which are otherwise silent when the excitation is an impulsive source.

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Ffowcs Williams, J. E., 1970. Inaugural lecture at Imperial College of Science and Technology.
Jones, D. S. and Morgan, J. D., 1972. Proc. Camb. Phil. Soc. Math. Phys. Sci., 72, 465488.

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