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An Euler code calculation of blade-vortex interaction noiseAn Euler code has been developed for calculation of noise radiation due to the interaction of a distributed vortex with a Joukowski airfoil. THe time-dependent incompressible flow field is first determined and then integrated to yield the resulting sound production through use of the elegant low-frequency Green's function approach. This code has several interesting numerical features involved in the vortex motion and in continuous satisfaction of the Kutta condition. In addition, it removes the limitations on Reynolds number and is much more efficient than an earlier Navier-Stokes code. Results indicate that the noise production is due to the deceleration and subsequent acceleration of the vortex as it approaches and passes the airfoil. Predicted acoustic levels and frequencies agree with measured data although a precise comparison would require the strength, size, and position of the incoming vortex to be known.
Document ID
19870038042
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Hardin, J. C.
(NASA Langley Research Center Hampton, VA, United States)
Lamkin, S. L.
(PRC Kentron, Inc. Hampton, VA, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1987
Publication Information
Publication: ASME, Transactions, Journal of Vibration, Acoustics, Stress, and Reliability in Design
Volume: 109
ISSN: 0739-3717
Subject Category
Acoustics
Report/Patent Number
ASME PAPER 86-WA/NCA-3
Accession Number
87A25316
Distribution Limits
Public
Copyright
Other

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