Accession Number:

AD0678624

Title:

COMPRESSIBILITY EFFECTS ON OSCILLATING ROTOR BLADES IN HOVERING FLIGHT,

Descriptive Note:

Corporate Author:

TEXAS A AND M UNIV COLLEGE STATION DEPT OF AEROSPACE ENGINEERING

Personal Author(s):

• Jones,W. P.
• Rao,B. M.

Report Date:

1968-10-01

Pagination or Media Count:

42.0

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