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New Low-Pressure-Ratio Fans for Quiet Business Aircraft Propulsion
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English
Abstract
Within the next few years tighter restrictions on general aviation aircraft noise are expected. It is anticipated that these noise restrictions, like those imposed on larger transport aircraft now certified under Federal Aircraft Regulations, will be revised downward over a period of time. While it is expected that initial restrictions can be met by the current propeller technology, the larger lower tip speed propellers necessary to meet succeedingly more stringent restrictions may prove difficult to accept. In this paper an alternative to the propeller as a propulsor for general aviation aircraft is discussed. This is the subsonic tip speed low-pressure ratio fan which can be mated to turboshaft, rotary combustion, or reciprocating engines to provide a low noise propulsor in a small package. Information is presented which shows tradeoffs among noise, weight, size, cost, and performance. Examples are included to show the influence of various noise targets on fan configuration and engine muffler requirements.
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Authors
Citation
Metzger, F. and Worobel, R., "New Low-Pressure-Ratio Fans for Quiet Business Aircraft Propulsion," SAE Technical Paper 730288, 1973, https://doi.org/10.4271/730288.Also In
References
- Worobel R. Mayo M. G. “Advanced General Aviation Propeller Study.” April 1971
- Volume III of Federal Aviation Regulations, Title 14 -Aeronautics and Space, Chapter 1 - Federal Aviation Administration Department of Transportation; Subchapter C - Aircraft; Part 21 - Certification Procedures for Products and Parts; Part 36 - Noise Standards: Aircraft Type Certification November 1969
- International Civil Aviation Organization - Committee on Aircraft Noise - Working Paper/22 Attachment A; Ordinance of the Federal Department of Transport, Communications and Power Concerning the Abatement of Aircraft Noise at Source July 16 1971
- Publication on Noise Certification of Aircraft up to 5700 Kg (12,500 lb) Maximum Certificated Weight and Powered Gliders April 1972
- Metzger F. B. Hanson D. B. “Low Pressure Ratio Fan Noise Experiment and Theory,” ASME Jr1. Engineering for Power 95 January 1973
- Metzger F. B. Ganger T. G. “PROP-FAN - Results of Initial Prop-Fan Model Acoustic Testing,” Dec. 4 1970
- Barry F. W. Magliozzi B. “Noise Detectability Prediction Method for Low Tip Speed Propellers.” Air Force Flight Dynamics Laboratory Technical Report AFFDL TR 71-37 June 1971
- Ungar E. E. et al. “A Guide for Predicting the Aural Detectability of Aircraft.” Air Force Flight Dynamics Laboratory Technical Report AFFDL-TR-71-22 March 1972
- Rudd M. J. Ungar E. E. “Parametric Noise Comparison of Muffled Piston and Rotating Combustion Engines for General Aviation Aircraft.” Bolt, Beranek and Newman Inc. Oct. 5 1972
- Galloway T. L. Waters M. H. “Computer Aided Parametric Analysis for General Aviation Aircraft.” Paper 730332 SAE Business Aircraft Meeting Wichita April 4-6 1973
- Waters M. H. Galloway T. L. Rohrbach C. Mayo M. G. “Shrouded Fan Propulsors for Light Aircraft.” Paper 730323 SAE Business Aircraft Meeting Wichita April 4-6 1973