Noise from turbomachinery.This paper reviews turbomachinery noise from turbofan engines as typified by fan noise. The mechanisms and theories of fan noise are reviewed and concepts for its reduction, including acoustic suppresion are discussed. Correlations of the overall noise data from several full-scale fans tested at NASA-Lewis Research Center are presented as indicative of the current state-of-the-art. Estimates are presented to show economics versus reduced noise for two quieted experimental engines, one with subsonic and one with supersonic fan tip speed. Finally, some concepts that may have the potential to reduce fan noise are indicated.
Document ID
19730052667
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Feiler, C. E.
Conrad, E. W. (NASA Lewis Research Center Cleveland, Ohio, United States)
Date Acquired
August 7, 2013
Publication Date
August 1, 1973
Subject Category
Propulsion Systems
Report/Patent Number
AIAA PAPER 73-815
Meeting Information
Meeting: Aircraft Design, Flight Test and Operations Meeting
Location: St. Louis, MO
Start Date: August 6, 1973
End Date: August 8, 1973
Sponsors: American Institute of Aeronautics and Astronautics