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The goal of the Contrails project is to help preserve and disseminate the technical record of 20th century aerospace research, highlighting in particular the research endeavors of the Illinois Tech community.

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

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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