Sound Propagation in Wakes.
PENNSYLVANIA STATE UNIV UNIVERSITY PARK ORDNANCE RESEARCH LAB
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A theoretical investigation of sound propagation through the near regions of both surface and underwater wakes is presented in the limits of ray acoustics. The two-dimensional stochastic ray equation is used to obtain solutions for the raypaths and intensities in model wakes. Calculations based upon velocity profile approximations which include layers of constant velocity gradients, distributions of bubbles, turbulence, and other inhomogeneities are represented by continuous, two-dimensional, refractive index fields. Random inhomogeneities are included by stochastically varying the refractive field at intervals approximately equal to the scale of the energy containing eddies. Ray plots and intensity contours are presented for a number of field configurations representing single and twin screw wakes.
- Fluid Mechanics