Accession Number:

AD0749139

Title:

The Generation and Radiation of Supersonic Jet Noise. Volume IV. Theory of Turbulence Generated Jet Noise, Noise Radiation from Upstream Sources, and Combustion Noise.

Descriptive Note:

Final technical rept. 1 May 71-31 May 72,

Corporate Author:

LOCKHEED-GEORGIA CO MARIETTA

Report Date:

1972-07-01

Pagination or Media Count:

189.0

Abstract:

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

Subject Categories:

  • Aircraft
  • Acoustics
  • Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE