Aerodynamics of a wing in turbulent bluff body wakes

The aerodynamics of a stationary wing in turbulent wake are investigated. Force and velocity measurements used to describe the unsteady flow. Various wakes studied with different dominant frequencies length scales. In contrast pre-stall angles attack, time-averaged lift increases substantially at post-stall attack as interacts von Kármán vortex street experiences temporal variations effective angle attack. At an optimal offset distance from centreline, becomes maximum despite small amplitude oscillations stall can reach 20° coefficient 64 % higher than that freestream. Whereas large fluctuations centreline cause excursions into fully attached separated flows during cycle, small-amplitude location result periodic shedding leading edge vortices. These vortices may produce separation bubbles reattachment near trailing-edge. Vorticity roll-up, strength size increase increasing wavelength period street, which also coincides spanwise scale incident wake, all contribute remarkable lift.