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Near Field Noise Analyses of Aircraft Propulsion Systems with Emphasis on Prediction Techniques for Jets

Report Number: AFFDL TR 67-43
Author: Plumblee, H. E.
Author: Ballentine, J. R.
Author: Passinos, B.
Corporate Author: Lockheed-Georgia Company
Laboratory: Air Force Flight Dynamics Laboratory
Date of Publication: 1967-08
Pages: 230
Contract: AF 33(615)-2503
Project: 1471
Task: 147102
AD Number: AD0822414

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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