Accession Number:

AD0743707

Title:

Far Field Noise Generation by Coaxial Flow Jet Exhausts. Volume 1. Detailed Discussion

Descriptive Note:

Final rept. Mar 1968-Nov 1971

Corporate Author:

WYLE LABS EL SEGUNDO CA

Personal Author(s):

Report Date:

1971-11-01

Pagination or Media Count:

253.0

Abstract:

Model scale air jets were used in an anechoic room to conduct a parametric study on the sound produced by coaxial circular jets. The results from these model tests were analyzed and scaled to give the overall sound power output, directivity indices and the sideline sound pressure spectra and perceived noise levels for engine thrusts ranging from 10,000 pounds to 80,000 pounds. The results were used to determine the reduction in overall sound power and maximum sideline perceived noise level as a function of the ratio of the secondary nozzle area to primary nozzle area and the ratio of secondary velocity to primary velocity.

Subject Categories:

  • Aircraft
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE