
Accession Number : ADP005041
Title : Modelling of the VortexAirfoil Interaction,
Corporate Author : HELLENIC AIR FORCE TECHNICAL RESEARCH CENTER ATHENS (GREECE)
Personal Author(s) : Panaras,Argyris G.
Report Date : NOV 1985
Pagination or Media Count : 16
Abstract : In this model of the vortexairfoil interaction the finitearea 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 wellformed 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 finitearea 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 timedependent pressure coefficient takes even negative values at some time intervals.
Descriptors : *VORTICES, *AIRFOILS, MATHEMATICAL MODELS, INTERACTIONS, SHEAR PROPERTIES, WAKE, PRESSURE DISTRIBUTION, COEFFICIENTS, LEADING EDGES, GREECE
Distribution Statement : APPROVED FOR PUBLIC RELEASE