Abstract
A systematic approach to the prediction of jet noise has been developed for conical, conventional bypass, and inverted-flow bypass nozzles. The prediction involves computation of the mean velocity, temperature, and relevant turbulence properties throughout the jet. Each turbulent eddy volume in the jet is treated as a statistically independent radiator of sound embedded in the mean-flowfield. The acoustic/mean-flow interaction is computed from high-frequency asymptotic solutions to Lilley's wave equation. Extensive theory-data comparisons indicate that acoustic/mean-flow interaction plays an important role, and that the prediction method can account for most of the observed characteristics of single- and dual-flow jets.
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