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- W2010078988 abstract "The dynamics of controlled transitory 3-D flow attachment within a separated flow domain over a stationary and pitching 2-D airfoil is investigated in wind tunnel experiments using a spanwise-compact pulsed actuation having a characteristic time scale that is an order of magnitude shorter than the convective time scale. It is shown that spanwise spreading of the induced transitory 3-D flow attachment beyond the spanwise edges of the actuator can amplify the aerodynamic performance of the airfoil compared to 2-D, spanwise-bounded actuation. The dynamics of the 3D attachment domain and some features of its spanwise structure above the airfoil and in its near wake are investigated using PIV. The temporal and spanwise variations of the 3-D attached domain result in corresponding variations of the vorticity over the both surfaces of the airfoil and consequently in significant changes in the time-dependent sectional circulation. Coupling of the pulsed actuation to the airfoil’s motion by sequenced actuation during the pitch cycle enhances the control authority of 3-D unsteady separation and can significantly mitigate the effects of dynamic stall and improve the unsteady aerodynamic lift and pitching moment." @default.
- W2010078988 created "2016-06-24" @default.
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- W2010078988 date "2013-01-05" @default.
- W2010078988 modified "2023-10-16" @default.
- W2010078988 title "Three-Dimensional Transitory Control of Flow Separation over a 2-D Airfoil" @default.
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- W2010078988 doi "https://doi.org/10.2514/6.2013-1116" @default.
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