NEAR FIELD NOISE ANALYSES OF AIRCRAFT PROPULSION SYSTEMS WITH EMPHASIS ON PREDICTION TECHNIQUES FOR JETS

Abstract

Semi-empirical methods are presented for calculating sound pressure level in a jet near noise field, including temperature and Mach number effects. A digital computer program for calculating constant SPL contours for the overall and octave band frequencies is incorporated. Machine plotted contours from model jet tests for a basic jet, VTOL jet, deflected jet, and jet with ejector are featured. Results of tip-turbine fan tests are given. Cruise fan, VTOL shrouded fan, and wing mounted configurations were tested.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1967
Accession Number
AD0822414

Entities

People

  • B. Passinos
  • H. E. Plumblee
  • J. R. Ballentine

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aircrafts
  • Airframes
  • Boundary Layer
  • Combustion
  • Combustion Products
  • Computer Programs
  • Exhaust Gases
  • Frequency Bands
  • Fuel Pumps
  • Fuel Systems
  • Heat Transfer
  • Jet Engine Fuels
  • Jet Engine Noise
  • Jet Engines
  • Recording Systems
  • Turbines
  • Turbojet Engines

Fields of Study

  • Physics

Readers

  • Aerodynamics/Aeronautics.
  • Aerospace Engineering
  • Auditory Neuroscience/Auditory Physiology.