GLTRS--Glenn
TITLE AND SUBTITLE:
Noise Reduction Potential of Large, Over-the-Wing Mounted, Advanced Turbofan Engines

AUTHOR(S):
Jeffrey J. Berton

REPORT DATE:
April 2000

FUNDING NUMBERS:
WU-714-99-20-00

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-12222

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-2000-210025

SUPPLEMENTARY NOTES:
Prepared for the 14th International Symposium on Air Breathing Engines sponsored by the International Society for Air Breathing Engines, Florence, Italy, September 5-10, 1999. Responsible person, Jeffrey J. Berton, organization code 2400, (216) 977-7031.

ABSTRACT:
As we look to the future, increasingly stringent civilian aviation noise regulations will require the design and manufacture of extremely quiet commercial aircraft. Indeed, the noise goal for NASA's Aeronautics Enterprise calls for technologies that will help to provide a 20 EPNdB reduction relative to today's levels by the year 2022. Further, the large fan diameters of modern, increasingly higher bypass ratio engines pose a significant packaging and aircraft installation challenge. One design approach that addresses both of these challenges is to mount the engines above the wing. In addition to allowing the performance trend towards large, ultra high bypass ratio cycles to continue, this over-the-wing design is believed to offer noise shielding benefits to observers on the ground. This paper describes the analytical certification noise predictions of a notional, long haul, commercial quadjet transport with advanced, high bypass engines mounted above the wing.

SUBJECT TERMS:
Noise prediction (aircraft); Aircraft noise; Jet aircraft noise

NUMBER OF PAGES:
19

PDF AVAILABLE FROM URL:
2000/TM-2000-210025.pdf
(293,023 KB)
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