The Generation and Radiation of Supersonic Jet Noise. Volume IV. Theory of Turbulence Generated Jet Noise, Noise Radiation from Upstream Sources, and Combustion Noise.
Final technical rept. 1 May 71-31 May 72,
LOCKHEED-GEORGIA CO MARIETTA
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The report presents a series of specific theoretical studies directed toward the solution of jet noise generation and radiation, upstream noise radiation and combustion noise generation. Three theories are presented. Lilleys work is a new theory of jet noise generation, based on identification of acoustic and source generation terms. The acoustic converted wave equation derived includes the Pridmore-BrownMungur shear refraction term. Plumblee presents a theoretical analysis and numerical solution techniques for solving for the radiation field from a source within a jet flow and specifically deals with radiation from an acoustic distribution initally specified at the end of a circular exhaust duct termination through the jet flow to the surrounding medium. Finally, Strahle presents a theory on afterburner type combustion noise generation and radiation. Order of magnitude analyses are made in an attempt to estimate acoustic power levels and refraction effects are also investigated. Author
- Jet and Gas Turbine Engines