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Unsteady lift forces on highly cambered airfoils moving through a gustAn unsteady airfoil theory in which the flow is linearized about the steady potential flow of the airfoil is presented. The theory is applied to an airfoil entering a gust. After transformation to the W-plane, the problem is formulated in terms of a Poisson's equation. The solutions are expanded in a Fourier-Bessel series. The theory is applied to a circular arc with arbitrary camber. Closed form expressions for the velocity and pressure on the surface of the airfoil are obtained. The unsteady aerodynamic forces are then calculated and shown to contain two terms. One in an explicit closed analytical form represents the contribution of the oncoming vortical disturbance, the other depends on a single quadrature and accounts for the effect of the wake.
Document ID
19740036057
Document Type
Conference Paper
Authors
Atassi, H.
(Notre Dame, University Notre Dame, Ind., United States)
Goldstein, M.
(NASA Lewis Research Center Cleveland, Ohio, United States)
Date Acquired
August 7, 2013
Publication Date
January 1, 1974
Subject Category
Aerodynamics
Report/Patent Number
AIAA PAPER 74-88
Meeting Information
Aerospace Sciences Meeting(Washington, DC)
Distribution Limits
Public
Copyright
Other
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