Accession Number : ADA114772

Title :   A Rotor Wake Model for Forward Flight Simulation Studies,

Corporate Author : AERONAUTICAL RESEARCH LABS MELBOURNE (AUSTRALIA)

Personal Author(s) : Reddy,K R

PDF Url : ADA114772

Report Date : Jun 1981

Pagination or Media Count : 30

Abstract : This Note presents an attempt to develop a rotor wake model for forward flight which requires only modest computing time and, therefore, is suitable for flight simulation studies. Free and rigid wake models are discussed, together with various simplifying assumptions, in order to reduce the computation time to acceptable levels for simulation studies. Using a tip vortex wake model and the Biot-Savart relation, induced velocities are calculated in the rotor plane. It is then assumed that the tip vortex wake takes the form of a skewed helix. Such a simple prescribed model requires little computing time and the accuracy of its results when compared with more elaborate free wake models shows considerable promise. (Author)

Descriptors :   *Flight simulation, *Helicopters, *Helicopter rotors, *Wake, Computerized simulation, Mathematical models, Aerodynamics, Computations, Vortices, Downwash, Australia

Subject Categories : Helicopters
      Numerical Mathematics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE