This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Quietening a Quiet Engine-The RB211 Demonstrator Programme
Annotation ability available
Sector:
Language:
English
Abstract
Against the background of the RB211/Lockheed L1011 development programme, which led to the certification of the quietest modern jet aircraft then entering service, Rolls-Royce determined to establish the realistic potential for further noise reductions on a high bypass ratio engine. Following a two year feasibility study the programme was launched in mid 1972 based around a standard production RB 211 engine. It is now essentially complete and the lessons learned from tests on almost 100 powerplant configurations bear witness to the problems of making inroads into further quietening similar modern engines. This paper summarises the important findings, highlights areas in which Research and Development should be concentrated and presents a judgment of future trends and implications.
Authors
Citation
Smith, M., "Quietening a Quiet Engine-The RB211 Demonstrator Programme," SAE Technical Paper 760897, 1976, https://doi.org/10.4271/760897.Also In
References
- ‘The Cause of Tone Generation by Aero Engine Fans at High Subsonic Tip speeds and the Effect of Forward Speed’ Cumpsty, N.A. Lowrie, B.W. ASME Paper 73.WA/GT-4
- ‘The Spectrum of Rotor Noise caused by Atmospheric Turbulence’ Hanson, D.B. 1974 Journal of the ASA
- ‘Simulation of Flight Effects on Aero Engine Fan Noise’ Lowrie B.W. 2nd AIAA Aeroacoustics Specialists Conference Hampton, Virginia March 1975
- NASA-GE Quiet Engine Programme National Aeronautic and Space Administration Washington DC 20546
- ‘Jet Engine Noise Source Location - The Polar Correlation Technique’ Fisher, M.J. Harper-Bourne, M. Glegg S.A.L. Journal of Sound and Vibration
- ‘Some Future Trends in Aero Engine Design for Subsonic Transport Aircraft’ Jackson, A.J.B. ASME Gas Turbine Conference Houston, Texas March 1975