GLTRS--Glenn
TITLE AND SUBTITLE:
Recent Developments in U.S. Engine Noise Reduction Research

AUTHOR(S):
James Bridges, Edmane Envia, and Dennis Huff

REPORT DATE:
September 2001

FUNDING NUMBERS:
WU-781-30-15-00

PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
John H. Glenn Research Center at Lewis Field
Cleveland, Ohio 44135-3191

PERFORMING ORGANIZATION REPORT NUMBER:
E-12927

SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
Washington, DC 20546-0001

REPORT TYPE AND DATES COVERED:
Technical Memorandum

SPONSORING/MONITORING AGENCY REPORT NUMBER:
NASA TM-2001-211083
ISABE-2001-1017

SUPPLEMENTARY NOTES:
Prepared for the Fifteenth International Symposium on Airbreathing Engines sponsored by the International Society for Airbreathing Engines, Bangalore, India, September 2-7, 2001. Responsible person, James Bridges, organization code 5940, 216-433-2693.

ABSTRACT:
Aircraft engine noise research in the United States has made considerable progress over the past 10 years for both subsonic and supersonic flight applications. The Advanced Subsonic Technology (AST) Noise Reduction Program started in 1994 and will be completed in 2001 without major changes to program plans and funding levels. As a result, significant progress has been made toward the goal of reducing engine source noise by 6 EPNdB (Effective Perceived Noise level in decibels). This paper will summarize some of the significant accomplishments from the subsonic engine noise research performed over the past 10 years. The review is by no means comprehensive and only represents a sample of major accomplishments.

SUBJECT TERMS:
Engine noise; Fan noise; Jet noise; Noise reduction; Turbulence; Subsonic

NUMBER OF PAGES:
14

PDF AVAILABLE FROM URL:
2001/TM-2001-211083.pdf
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