Showing papers on "Vortex lattice method published in 1975"

Subsonic aerodynamic characteristics of interacting lifting surfaces with separated flow around sharp edges predicted by a vortex-lattice method

Abstract: Because the potential flow suction along the leading and side edges of a planform can be used to determine both leading- and side-edge vortex lift, the present investigation was undertaken to apply the vortex-lattice method to computing side-edge suction force for isolated or interacting planforms. Although there is a small effect of bound vortex sweep on the computation of the side-edge suction force, the results obtained for a number of different isolated planforms produced acceptable agreement with results obtained from a method employing continuous induced-velocity distributions. By using the method outlined, better agreement between theory and experiment was noted for a wing in the presence of a canard than was previously obtained.

Three-Dimensional Wing/Jet Interaction Analysis including Jet Distortion Influences

Abstract: Analysis of the interaction of wings with regions of high-energy flow in a uniform stream is motivated by the requirement to predict the aerodynamic characteristics of powered lift systems. The present formulation of the wing/jet problem includes jet deflection and distortion effects. Each jet boundary and wing is replaced by equivalent flow singularities embedded in a uniform stream. The singularity strengths and locations cannot be obtained directly since the jet position is unknown; therefore, an iterative solution technique is employed. Example calculations are presented and comparisons of current solutions are made with previous analyses and experiments.