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Energetics of oscillating lifting surfaces using integral conservation lawsThe energetics of oscillating flexible lifting surfaces in two and three dimensions is calculated by the use of integral conservation laws in inviscid incompressible flow for general and harmonic transverse oscillations. Total thrust is calculated from the momentum theorem and energy loss rate due to vortex shedding in the wake from the principle of conservation of mechanical energy. Total power required to maintain the oscillations and hydrodynamic efficiency are also determined. In two dimensions, the results are obtained in closed form. In three dimensions, the distribution of vorticity on the lifting surface is also required as input to the calculations. Thus, unsteady lifting-surface theory must be used as well. The analysis is applicable to oscillating lifting surfaces of arbitrary planform, aspect ratio, and reduced frequency and does not require calculation of the leading-edge thrust.
Document ID
19870035200
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Ahmadi, Ali R.
(BBN Laboratories, Inc. Cambridge, MA, United States)
Widnall, Sheila E.
(MIT Cambridge, MA, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1987
Subject Category
Aerodynamics
Report/Patent Number
AIAA PAPER 87-0193
Accession Number
87A22474
Funding Number(s)
CONTRACT_GRANT: NGR-22-009-818
Distribution Limits
Public
Copyright
Other

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