State-of-the-Art Review of Turbine Engine Inlet Noise.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1972
- Accession Number
- AD0753000
Entities
People
- Robert B. Benham