Accession Number : ADA139583

Title :   Special Opportunities in Helicopter Aerodynamics.

Descriptive Note : Technical memo.,

Corporate Author : NATIONAL AERONUATICS AND SPACE ADMINISTRATION MOFFETT FIELD CA AMES RESEARCH CENTER

Personal Author(s) : McCroskey,W J

PDF Url : ADA139583

Report Date : Dec 1983

Pagination or Media Count : 34

Abstract : Aerodynamic research relating to modern helicopters includes the study of three-dimensional, unsteady, nonlinear flow fields. A selective review is made of some of the phenomenon that hamper the development of satisfactory engineering prediction techniques, but which provides a rich source of research opportunities: flow separations, compressibility effects, complex vortical wakes, and aerodynamic interference between components. Several examples of work in progress are given, including dynamic stall alleviation, the development of computational methods for transonic flow, rotor-wake predictions, and blade-vortex interactions. (Author)

Descriptors :   *Aerodynamics, *Helicopters, *Rotor blades(Rotary wings), Interference, Unsteady flow, Stalling, Wake, Vortices, Flow fields, Three dimensional flow, Flow separation, Transonic flow, Interactions, Aerodynamic forces, Aeronautical engineering, Numerical methods and procedures

Subject Categories : Helicopters
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE