Developments in jet noise modelling—theoretical predictions and comparisons with measured data |
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Authors: | BJ Tester CL Morfey |
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Institution: | Lockheed-Georgia Company, Marietta, Georgia 30063, U.S.A.;Institute of Sound and Vibration Research, University of Southampton, Southampton S09 5NH, England |
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Abstract: | Spectral information on the sound radiated from turbulent shock-free jets is now available over a wide range of Strouhal numbers, for jet densities ranging from 0·3 to 2 times the ambient density and jet velocities ranging from 0·3 to 2 times the ambient sound speed. In order to account for some of the trends observed, a jet noise model is developed which takes account of acoustic-mean flow interaction. The model is based on a shear flow analogy, for which the governing equation is Lilley's equation, and numerical solutions are obtained for sources representative of turbulent mixing noise. Analytic solutions developed for low- and high-frequency excitation show good agreement with the numerical results. Finally, the model predictions are compared with measurements on hot and isothermal jets. |
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