Accession Number:

AD0822414

Title:

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

Descriptive Note:

Final rept. Jul 1965-Apr 1967

Corporate Author:

LOCKHEED-GEORGIA CO MARIETTA

Personal Author(s):

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

Report Date:

1967-08-01

Pagination or Media Count:

230.0

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.

Descriptors:

• *TURBOFAN ENGINES
• *JET ENGINE NOISE
• *TURBORAMJET ENGINES
• VELOCITY
• COMPUTER PROGRAMS
• PREDICTIONS
• TEST METHODS
• CONFIGURATIONS
• SOUND
• SUPERSONIC NOZZLES
• ACOUSTIC DETECTORS
• DUCTED FANS
• EXHAUST GASES
• EXHAUST NOZZLES
• JET FLOW
• PRESSURE
• FLOW FIELDS
• DEFLECTION
• MEASUREMENT
• DATA PROCESSING

Subject Categories:

• Acoustics
• Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE