Accession Number:

AD0753000

Title:

State-of-the-Art Review of Turbine Engine Inlet Noise.

Descriptive Note:

Final technical rept.,

Corporate Author:

NAVAL AIR PROPULSION TEST CENTER TRENTON N J PROPULSION TECHNOLOGY AND PROJECT ENGINEERING DEPT

Personal Author(s):

• Benham,Robert B.

Report Date:

1972-11-01

Pagination or Media Count:

159.0

Abstract:

The report points out that turbine-type engine design is evolving in a direction which will make fan and compressor turbomachinery noise continually more obstrusive. The TF34 engine is representative of state-of-the-art high bypass ratio subsonic turbofan technology. It contains no inlet noise-suppression design and the inlet noise exceeds Federal Air Regulation Part 36 take-off sideline noise limits by about 6PNdb. There are descriptions and theoretical presentations explaining the principal mechanisms producing the three inlet noise contributors interaction tones, combination tones, and broadband radiation. It is shown that noise control can be affected either at the rotor-stator source or with nacelle installation attenuation. Author

Descriptors:

• *TURBOJET INLETS
• *TURBOFAN ENGINES
• JET ENGINE NOISE
• NOISE
• ATTENUATION
• INLET GUIDE VANES
• DUCT INLETS
• VORTICES
• ACOUSTIC INSULATION
• STATE OF THE ART
• REPORTS

Subject Categories:

• Acoustics
• Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE