NOISE SUPPRESSION WITH HIGH MACH NUMBER INLETS

Experimental results were obtained for two types of high Mach number inlets, one with a translating centerbody and a fixed geometry inlet (collapsing cowl) with no centerbody. The aerodynamic and acoustic performance of these inlets was examined. The effects of area ratio, length/diameter ratio, and lip geometry were among several parameters investigated. The translating centerbody type inlet was found to be superior to the collapsing cowl both acoustically and aerodynamically, particularly for area ratios greater than 1.5. Comparison of length/diameter ratio and area ratio effects on performance near choked flow showed the latter to be more significant. Also, greater high frequency noise attenuation was achieved by increasing Mach number from low to high subsonic values. (Author)

• Corporate Authors:

  University of Tennessee, Knoxville

  203 Administration Building
  Knoxville, TN  United States  37996-0700
• Authors:
  • Lumsdaine, E
  • Cherng, J G
  • Tag, I
• Publication Date: 1976-7

Media Info

• Pagination: 108 p.

Subject/Index Terms

• TRT Terms: Acoustics; Aerodynamics; Engines; Noise; Noise control; Performance; Vehicle design
• Uncontrolled Terms: Noise reduction
• Old TRIS Terms: Engine design; Engine inlets; Inlet flow
• Subject Areas: Aviation; Design; Environment; Vehicles and Equipment;

Filing Info

• Accession Number: 00145779
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: NASA-CR-2708
• Files: TRIS
• Created Date: Jan 16 1977 12:00AM