Accession Number : AD0678624

Title :   COMPRESSIBILITY EFFECTS ON OSCILLATING ROTOR BLADES IN HOVERING FLIGHT,

Corporate Author : TEXAS A AND M UNIV COLLEGE STATION DEPT OF AEROSPACE ENGINEERING

Personal Author(s) : Jones,W. P. ; Rao,B. M.

Report Date : OCT 1968

Pagination or Media Count : 42

Abstract : A theory is developed and used for determining the influence of compressibility on the aerodynamic forces acting on helicopter rotor blades when oscillating in hovering flight. The usual two-dimensional mathematical model of the flow is adopted in which a section of the reference rotor blade and its helical wake is replaced by an airfoil with a straight wake and a system of regularly spaced infinite wakes below, the amount of spacing depending on the downward flow induced by the rotor and the number of blades. (Author)

Descriptors :   (*HELICOPTER ROTORS, COMPRESSIBLE FLOW), HOVERING, MATHEMATICAL MODELS, VORTICES, LIFT, TWO DIMENSIONAL FLOW, OSCILLATION, PARTIAL DIFFERENTIAL EQUATIONS, WAKE, DOWNWASH

Subject Categories : Aerodynamics
      Helicopters
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE