Abstract
Sound can be scattered by turbulence inside a cylindrical resonator. The turbulence is generated by rotating a smaller concentric cylinder at high speeds, and the sound is introduced by forcing the cylinder end plate. The structure of the turbulence has been studied with hot wire anemometers. The cylinder dimensions are such that only axial acoustic modes can occur. The interaction is detected (1) by measuring the lowering in Q value of a mode due to turbulent scattering, and (2) by measuring the equilibrium sound level in the scattered modes. Starting with the Lighthill formulation of the problem, one can obtain expressions for scattered power and relate the theoretical values to the measured quantities. [Supported by Owens-Corning Fiberglas Corporation Fellowship in Acoustics and by Contract NAw-6463 with the National Advisory Committee for Aeronautics.]
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