Modelling of the Vortex-Airfoil Interaction,
HELLENIC AIR FORCE TECHNICAL RESEARCH CENTER ATHENS (GREECE)
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In this model of the vortex-airfoil interaction the finite-area of the real vortices is taken in consideration. Two vortex models are used. In the first, a disturbed piece of vorticity layer is simulated by four rows of discrete vortices of small strength. In the second, a number of discrete vortices is arranged within a circle. The first model may simulate a shear layer or a wake, while the second, a well-formed vortex. The method has been applied to calculation of the pressure induced on the surface of the airfoil by the interacting vortex. Both models give similar results. It has been found that for large distances of the vortex from the surface of the airfoil the consideration or not of the finite-area of the vortex is not a significant factor in determining the induced pressure field. However, when the distance of the vortex from the surface is reduced, its shape is distorted and the induced pressure pulses have lower amplitude than the ones induced by an equivalent point vortex. In the limit, where the vortex impinges on the leading edge of the airfoil, it is split into two and the time-dependent pressure coefficient takes even negative values at some time intervals.