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Record Details

Record 37 of 22163
The design and flight test of an engine inlet bulk acoustic liner
Author and Affiliation:
Lester, H. C.(NASA Langley Research Center, Hampton, VA, United States)
Preisser, J. S.(NASA Langley Research Center, Hampton, VA, United States)
Parrott, T. L.(NASA Langley Research Center, Hampton, VA, United States)
Abstract: This paper summarizes the design, fabrication and flight evaluation of a Kevlar acoustic liner configuration for a JT15D turbofan engine. The liner was designed to suppress, by a measurable amount, a dominant (13,0) BPF tone. This tone or spinning mode was produced for research purposes by installing 41 circumferentially distributed small diameter rods upstream of the 28 fan blades. Duct liner attenuations calculated by a finite element procedure were compared to far field power (insertion) losses deduced from flight data. The finite element program modeled the variable geometry of the JT15D inlet and used a uniform flow with a boundary layer roll-off to model the inlet flow field. Calculated liner losses were generally conservative. That is, measured far field power losses were generally greater than attenuations calculated by the finite element computer program.
Publication Date: Apr 01, 1983
Document ID:
19830044745
(Acquired Nov 30, 1995)
Accession Number: 83A25963
Subject Category: AIRCRAFT PROPULSION AND POWER
Report/Patent Number: AIAA PAPER 83-0781
Document Type: Conference Paper
Publisher Information: United States
Meeting Information: American Institute of Aeronautics and Astronautics, Aeroacoustics Conference; 8th; Apr. 11-13, 1983; Atlanta, GA
Meeting Sponsor: American Institute of Aeronautics and Astronautics
Financial Sponsor: NASA; United States
Organization Source: NASA Langley Research Center; Hampton, VA, United States
Description: 12p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ENGINE INLETS; ENGINE NOISE; FLIGHT TESTS; LININGS; NOISE REDUCTION; TURBOFAN ENGINES; AEROACOUSTICS; COMPUTER PROGRAMS; ENGINE DESIGN; FLOW DISTRIBUTION; KEVLAR (TRADEMARK)
Imprint And Other Notes: American Institute of Aeronautics and Astronautics, Aeroacoustics Conference, 8th, Atlanta, GA, Apr. 11-13, 1983, 12 p.
Availability Source: Other Sources
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