HIGH VELOCITY JET NOISE SOURCE LOCATION AND REDUCTION TASK 3. EXPERIMENTAL INVESTIGATON OF SUPPRESSION PRINCIPLES VOLUME III. SUPPRESSOR CONCEPTS OPTIMIZATION

Experimental investigations were conducted of suppression principles, including developing an experimental data base, developing a better understanding of jet noise suppression principles, and formulating empirical methods for the acoustic design of jet noise suppressors. Acoustic scaling has been experimentally demonstrated, and five 'optimum' nozzles have been selected for subsequent anechoic free-jet testing. Several studies were conducted to attempt an optimization of suppressor concepts. Trade studies of performance versus suppression, aircraft integration studies, and development of a figure-of-merit method of analysis all make up the activities in this 'optimization' process. The end product of this effort was to design five nozzles for static and free-jet testing. Demonstration of acoustic scaling for several suppressor configurations was conducted to assure the adequacy of using scale-model results to project full-scale suppression levels. Full-scale data were obtained on several suppressor configurations using J79 and J85 engines. Scale-model data were obtained for these same configurations to allow comparison of scale-model and full-scale results.

• Supplemental Notes:
  • See also Task 3, Volume 4, AD-A094 296.
• Corporate Authors:

  General Electric

  Marine Turbine & Gear Engineer, 1100 Western Ave
  Lynn, MA  United States  01910

  Federal Aviation Administration

  800 Independence Avenue, SW
  Washington, DC  United States  20591
• Authors:
  • Brown, R H
  • Clapper, W S
  • Joy, W
  • SMITH, M A
  • Stringas, E J
• Publication Date: 1978-12

Media Info

• Pagination: 170 p.

Subject/Index Terms

• TRT Terms: Aircraft noise; Alternatives analysis; Databases; Exhaust gases; Flow; Jet engines; Mathematical prediction; Noise control; Nozzles; Optimization; Scaling factor; Suppressors; Velocity
• Uncontrolled Terms: High velocity; Noise reduction; Sources
• Old TRIS Terms: Conical nozzles; Exhaust nozzles; Jet engine noise; Jet flow; Nozzle gas flow
• Subject Areas: Data and Information Technology; Environment; Vehicles and Equipment;

Filing Info

• Accession Number: 00328895
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: R78AEG627-VOL-3, FAA-RD-76-79-3-3
• Contract Numbers: DOT-OS-30034
• Files: NTIS, USDOT
• Created Date: May 21 2003 12:00AM