Accession Number : AD0837147

Title :   BOUNDARY-LAYER STUDIES ON HELICOPTER ROTORS IN FORWARD FLIGHT,

Corporate Author : ARMY AERONAUTICAL RESEARCH LAB MOFFETT FIELD CA

Personal Author(s) : McCroskey, W. J.

Report Date : 1968

Pagination or Media Count : 13

Abstract : In the analysis of boundary layers on rotors in forward flight, the essential features of the flow were demonstrated by means of relatively simple analytical solutions. Within the framework of the small crossflow and quasi-steady approximations, which are valid over most of the rotor, the laminar flow is now well understood. An important exception is the detailed structure of the flow near the separation lines, where recourse to numerical analysis of the full three-dimensional, unsteady Navier-Stokes equations are required if to predict accurately the maximum lift that can be produced by a rotor. (Author)

Descriptors :   (*HELICOPTER ROTORS, AERODYNAMIC CHARACTERISTICS), ROTOR BLADES(ROTARY WINGS), FLOW SEPARATION, FLOW FIELDS, VISCOSITY, MATHEMATICAL ANALYSIS, MATHEMATICAL MODELS, LAMINAR FLOW, INCOMPRESSIBLE FLOW, LEVEL FLIGHT, TWO DIMENSIONAL FLOW, LIFT, SKIN FRICTION, DRAG, VELOCITY, BOUNDARY LAYER, TURBULENCE.

Subject Categories : Helicopters
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE