Pressure spectra in turbulent free shear flows
Abstract
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 exp -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 exp -11/3 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.
- Publication:
-
American Institute of Aeronautics and Astronautics Conference
- Pub Date:
- June 1980
- Bibcode:
- 1980aiaa.confT....G
- Keywords:
-
- Fluid Mechanics;
- Free Flow;
- Pressure Oscillations;
- Shear Flow;
- Turbulent Flow;
- Fourier Transformation;
- Mixing Layers (Fluids);
- Poisson Equation;
- Pressure Measurement;
- Spectrum Analysis;
- Static Pressure;
- Fluid Mechanics and Heat Transfer