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Aeroacoustics of Propulsion Airframe Integration: Overview of NASA's ResearchThe integration of propulsion and airframe is fundamental to the design of an aircraft system. Many considerations influence the integration, such as structural, aerodynamic, and maintenance factors. In regard to the acoustics of an aircraft, the integration can have significant effects on the net radiated noise. Whether an engine is mounted above a wing or below can have a significant effect on noise that reaches communities below because of shielding or reflection of engine noise. This is an obvious example of the acoustic effects of propulsion airframe installation. Another example could be the effect of the pylon on the development of the exhaust plume and on the resulting jet noise. In addition, for effective system noise reduction the impact that installation has on noise reduction devices developed on isolated components must be understood. In the future, a focus on the aerodynamic and acoustic interaction effects of installation, propulsion airframe aeroacoustics, will become more important as noise reduction targets become more difficult to achieve. In addition to continued fundamental component reduction efforts, a system level approach that includes propulsion airframe aeroacoustics will be required in order to achieve the 20 dB of perceived noise reduction envisioned by the long-range NASA goals. This emphasis on the aeroacoustics of propulsion airframe integration is a new part of NASA s noise research. The following paper will review current efforts and highlight technical challenges and approaches.
Document ID
20030065859
Acquisition Source
Langley Research Center
Document Type
Other
Authors
Thomas, Russell H. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2003
Subject Category
Aircraft Design, Testing And Performance
Report/Patent Number
NOISE-CON Paper 105
Meeting Information
Meeting: NOISE-CON 2003: National Conference on Noise Control
Location: Cleveland, OH
Country: United States
Start Date: June 23, 2003
End Date: June 25, 2003
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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