Low Drag Airfoil Design Utilizing Passive Laminar Flow and Coupled Diffusion Control Techniques

A two-dimensional high chord Reynolds number passive laminar airfoil was designed for a C sub l = 0.73 at a M at infinity = 0.6 and Re sub c = 4 times 10 to the 7th power providing an extremely high L/D = 240. This laminar airfoil design concept integrates passive laminar flow stabilization, by pres...

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Bibliographic Details
Main Author: Mask,R L
Format: Report
Language:English
Subjects:
AERODYNAMICS
CONTROL
DIFFUSION
EXPERIMENTAL DATA
EXPERIMENTAL DESIGN
Fluid Mechanics
LAMINAR FLOW
LIFT TO DRAG RATIO
LOW DRAG AIRFOILS
REYNOLDS NUMBER
SUBSONIC FLIGHT
TEST FACILITIES
TRAILING EDGES
WIND TUNNELS
WINGS
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Summary:A two-dimensional high chord Reynolds number passive laminar airfoil was designed for a C sub l = 0.73 at a M at infinity = 0.6 and Re sub c = 4 times 10 to the 7th power providing an extremely high L/D = 240. This laminar airfoil design concept integrates passive laminar flow stabilization, by pressure gradient shaping, with active diffusion control techniques on the airfoil trailing edge. A discussion of the airfoil design concept and the predicted performance is presented. Full scale Reynolds number passive laminar flow/transition experiments defining maximum transition Reynolds number and real flow environment influence on transition are presented. Examination of wind tunnel scaling influences and real flow environment effects on the ATC/laminar airfoil performance are discussed and summarized for typical low turbulence tunnels. (Author)