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A PRELIMINARY STUDY OF THE EFFECT OF A RADIAL PRESSURE
THE BOUNDARY LAYER OF THE HOVERING ROTOR
AN INVESTIGATION OF THE FEASIBILITY OF A COMMON BOUNDARY
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advance ratio aircraft airfoil drag airfoil section American Helicopter Society analysis angle of attack approximation blade stall boundary layer control boundary layer flow boundary layer thickness chemical film chord chordwise collective pitch degrees dimensional direction distributed suction drag coefficient EFFECTS ON ROTOR equation experimental flat plate flow effects fluid injection forward flight Helicopter Rotor high-lift boundary layer hot wire hovering rotor increased independence principle indicated induced velocity laminar boundary layer LAMINAR FLOW PROFILE layer control system leading edge lift characteristics lift coefficient low-drag lower surface Mach number Mississippi State University NACA Technical Note obtained percent radius pressure drag radial flow Reference 12 Research Reynolds number rotating rotor performance shown in Figure skin friction skin-friction span axis spanwise flow spanwise pressure gradient speed studies Swept Wing theoretical theory turbulent boundary layer two-dimensional airfoil UH-1 tail rotor upper surface variable camber wing variation velocity component viscous Wind Tunnel yaw angle yawed wing