GROUND AND IN-FLIGHT ACOUSTIC AND PERFORMANCE CHARACTERISTICS OF JET-AIRCRAFT EXHAUST NOISE SUPPRESSORS

Abstract

Characteristics were determined for a twin-engine jet aircraft with the following configurations: (1) eight-lobe exhaust noise suppressors, (2) eight-lobe nozzles and ejectors, and (3) the unmodified aircraft. In-flight sound pressure levels measured on the ground under the flight path were reduced 5 to 6 decibels by the suppressors. Similar reductions in perceived noise level occurred. Increases in total drag coefficient of 3 and 7 percent and decreases in specific range of 5 to 14 percent were found to result from the suppressor configurations. (Author)

Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1961
Accession Number
AD0260759

Entities

People

  • John A. Mihaloew
  • Willard D. Coles
  • William H. Swann

Organizations

  • National Aeronautics and Space Administration

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aircraft Exhaust
  • Aircrafts
  • Coefficients
  • Flight
  • Flight Paths
  • Jet Aircraft
  • Sound Pressure
  • Suppressors

Readers

  • Acoustics.
  • Aerospace Engineering
  • Combustion and Flow Dynamics.

Technology Areas

  • Space
  • Space - Hall-Effect Thruster