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Fan noise prediction assessmentThis report is an evaluation of two techniques for predicting the fan noise radiation from engine nacelles. The first is a relatively computational intensive finite element technique. The code is named ARC, an abbreviation of Acoustic Radiation Code, and was developed by Eversman. This is actually a suite of software that first generates a grid around the nacelle, then solves for the potential flowfield, and finally solves the acoustic radiation problem. The second approach is an analytical technique requiring minimal computational effort. This is termed the cutoff ratio technique and was developed by Rice. Details of the duct geometry, such as the hub-to-tip ratio and Mach number of the flow in the duct, and modal content of the duct noise are required for proper prediction.
Document ID
19950027410
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Bent, Paul H.
(McDonnell-Douglas Aerospace Long Beach, CA, United States)
Date Acquired
September 6, 2013
Publication Date
May 1, 1995
Subject Category
Acoustics
Report/Patent Number
NAS 1.26:195051
NASA-CR-195051
CRAD-9310-TR-0128
Accession Number
95N33831
Funding Number(s)
PROJECT: RTOP 538-03-11-01
CONTRACT_GRANT: NAS1-20103
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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