ACTIVE CONTROL OF MULTI-ELEMENT ROTOR BLADE AIRFOILS

ACTIVE CONTROL OF MULTI-ELEMENT ROTOR BLADE AIRFOILS

A multi-element rotor blade includes a main element and an active slat movable relative to the main element. The slat rotates and translates relative to the main element from a base position. The base position provides a compromise between minimum coefficient of drag CD and maximum coefficient of li...

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Bibliographische Detailangaben
Hauptverfasser: WELSH WILLIAM ARTHUR, DAVIS GEOFFREY C.R, MOFFITT ROBERT C, BERNHARD ANDREAS P.F, LORBER PETER F, WAKE BRIAN E, TOROK MICHAEL S
Format: Patent
Sprache:eng
Schlagworte:
AEROPLANES
AIRCRAFT
AVIATION
COSMONAUTICS
HELICOPTERS
PERFORMING OPERATIONS
TRANSPORTING
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Beschreibung
Zusammenfassung:A multi-element rotor blade includes a main element and an active slat movable relative to the main element. The slat rotates and translates relative to the main element from a base position. The base position provides a compromise between minimum coefficient of drag CD and maximum coefficient of lift CLmax. In the advancing blade, since the airspeed thereof is significantly greater than the retreating blade, the slat is positively rotated from the base position to minimizes drag at low angles of attack. In the retreating blade, since the airspeed thereof is significantly lower than the advancing blade, the slat is negatively rotated and translated to maximize the coefficient of lift CLmax.