Noise Considerations in High Bypass Ratio Fan Engine Design PUBLIC ACCESS

[+] Author Affiliations
A. O. Kohn

General Electric Co., Cincinnati, OH

Paper No. 70-WA/GT-14, pp. V001T01A011; 9 pages
  • ASME 1970 Winter Annual Meeting: GT Papers
  • ASME 1970 Winter Annual Meeting: GT Papers
  • New York, New York, USA, November 29–December 3, 1970
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-8004-3
  • Copyright © 1970 by ASME


The General Electric Company is engaged in a number of programs to reduce aircraft-engine noise, ranging from the reheat turbojet for the SST to high bypass ratio lift fans for V/STOL applications. Many of these programs are government-sponsored and have been described elsewhere. The major company-sponsored program is development of the reduced-noise CF6 engine, a design undertaken to achieve a noise level significantly below that of current engines. Analysis and experimental work — done on scale model and engine fans to arrive at the best tradeoff between weight, performance, and noise — resulted in a aerodynamic design that, coupled with development of efficient acoustic treatment of the ducts, has yielded an engine measuring 10 PNdB quieter than current operational engines. The author details three specific technical problem areas (acoustic treatment, turbine noise, and modulation tones) and their impact on CF6 noise.

Copyright © 1970 by ASME
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