The aerodynamics of an inverted airfoil close to a moving ground oscillating periodically in pure pitching motion and in combined pitching–heaving motion has been studied numerically. The main effect of the ground in pure pitching is to increase separation on the suction side, leading to larger hysteresis. At low frequencies, the airfoil under pitching motion can stall if the flow remains separated for a large part of the cycle. This type of stall is characteristically different from dynamic stall in freestream. Regarding the combined pitching and heaving motion, the pitch mode controls the flow at low frequencies, whereas the heave mode prevails at high frequencies. The interaction between both modes of motion is determined by the phase shift between them, and the modes can interact positively or negatively. The introduction of heaving can help improve the stall characteristics of an isolated pitching motion when flapping at low ground clearances.
Aerodynamics of a Pitching and Heaving Airfoil in Ground Effect
AIAA Journal ; 54 , 4 ; 1158-1171
2016-02-24
14 pages
Article (Journal)
Electronic Resource
English
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