PROPELLER WAKE SHEET ROLL-UP MODELING IN 3-DIMENSIONS

An algorithm for predicting the complete three-dimensional vortex shee t roll-up is developed. A higher order panel method, which combines a hyperboloidal panel geometry with a bi-quadratic dipole distribution, is used in order to accurately model the highly rolled-up regions. For given radial circulation distributions, the predicted wake shapes are shown to be convergent and consistent with those predicted from other methods. Then, a previously developed flow-adapted grid and the three -dimensional wake sheet roll-up algorithm are combined in order to est imate the propeller loading/trailing wake interaction. The complete wa ke geometry is determined by the method without the need of any experi mental information on the shape of the wake. Predicted forces and tip vortex trajectories are shown to agree well with those measured in exp eriments.