PRESSURE SPECTRA IN TURBULENT FREE SHEAR FLOWS.

Spectral models for turbulent pressure fluctuations are developed by directly Fourier transforming the integral solution to the Poisson equation for a homogeneous, constant mean shear flow. The turbulence-turbulence interaction is seen to possess a k** minus **7**/**3 inertial subrange and to dominate the high wavenumber region. The turbulence-mean shear contribution is seen to be dominant in the energy containing range and falls off as k** minus **1**1**/**3 in the inertial subrange. The subrange constants and the mean square pressure fluctuation are evaluated using a spectral model for the velocity. A spectral analysis of the velocity contamination of a pressure probe is also presented. Results are compared to spectral measurements with a static pressure probe in the mixing layer of an axisymmetric jet.