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Lifting-surface theory for propfan vortices impinging on a downstream wingRetrofitment of commercial aircraft with propfans could introduce undesirable aerodynamic sources of structure-borne noise that are absent for current turbojet powerplants. This paper theoretically examines the whipping action of the vortex wake from a generic propeller on the downstream rigid wing that supports it. The model addresses the high-frequency/compressible regime of most anticipated propfan implementations and produces an analytic solution for the distributed wing airload due to the periodic vortex impingement. The analysis also yields an expression for the local unsteady lift obtained from integration over an arbitrary internal patch of wing surface, for the purpose of applying a practical number of such forces at the nodes of a finite-element model for the corresponding structure (wing response results are not included in the present paper). Reported estimates of induced wing loads for a conventional-propeller example of demonstration appear to be in the reasonable range of expectation.
Document ID
19890054642
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Martinez, R.
(Cambridge Acoustical Associates, Inc. MA, United States)
Date Acquired
August 14, 2013
Publication Date
July 1, 1989
Publication Information
Publication: Journal of Aircraft
Volume: 26
ISSN: 0021-8669
Subject Category
Aerodynamics
Accession Number
89A42013
Funding Number(s)
CONTRACT_GRANT: NAS1-18020
Distribution Limits
Public
Copyright
Other

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