Finite-difference solutions of three-dimensional rotor blade-vortex interactionsA numerical finite-difference procedure has been developed for the modeling of rotor self-generated blade-vortex interactions (BVI). The interaction velocity field is obtained through a nonlinear superposition of the rotor and the vortex wake flow fields. Vortex effects are simulated using the velocity 'transpiration' approach. Potential blade-vortex encounters are identified and tracked in time at equal increments of rotor azimuth using the lifting-line helicopter/rotor trim code CAMRAD. Accuracy of the numerical results were found to rely heavily on the CAMRAD-predicted vortex orientation, vortex strength, and user specified vortex core radius. Results for the subcritical self-generated BVI for the model OLS rotor are presented. They show good agreement with the experimental wind tunnel data.
Document ID
19910043999
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Hassan, A. A. (McDonnell Douglas Helicopter Co. Mesa, AZ, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1990
Subject Category
Aerodynamics
Meeting Information
Meeting: Southeastern Conference on Theoretical and Applied Mechanics