Accession Number:

AD0749138

Title:

The Generation and Radiation of Supersonic Jet Noise. Volume III. Progress Toward a Unified Theory of Jet Engine Noise.

Descriptive Note:

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

Corporate Author:

LOCKHEED-GEORGIA CO MARIETTA

Personal Author(s):

Report Date:

1972-07-01

Pagination or Media Count:

151.0

Abstract:

Existing theories of aerodynamic noise generation are critically reviewed with special emphasis on conceptual adequacy and physical scope with special reference to supersonic jet noise. In this review the basic work of Stokes, Kirchoff and Rayleigh on fluctuating motions in fluids is recalled and developed to provide a firm basis for the critique. The advantages and disadvantages of acoustic analogy theories such as Lighthills are thoroughly discussed in Section 11.3. A contribution is made towards removing the criticisms made by Lighthill of Ribners isotropic source tensor theory. New developments such as those by Crow, Lilley and Doak are emphasized. On the basis of the evidence provided by the critical review, a new unified theory for jet noise has been devised. Author

Subject Categories:

  • Aircraft
  • Acoustics
  • Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE