Accession Number:

AD0655012

Title:

THE HIGH-FREQUENCY REGION OF THE SPECTRUM OF NOISE FORMATION OF A JET,

Descriptive Note:

Corporate Author:

FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Report Date:

1967-01-23

Pagination or Media Count:

20.0

Abstract:

The spectrum and characteristics of the directivity of noise emitted by a submerged air jet flowing from a tapered nozzle at an excess pressure greater than the critical pressure which is equal to 0.9 atm are studied. The results of measuring the spectrum and the characteristics of directivity, which were compared with photographs of a jet in different operating conditions, allow one to consider that in the emission spectrum of a jet there is discrete emission connected with the cellular structure of the jet, high-frequency noise, which can be connected with vortical Mach waves, and comparatively low-frequency noise of turbulent origin. Author

Subject Categories:

  • Aerodynamics
  • Acoustics
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE