Large-Eddy Simulation for Laminar Separation Control With Recessed Dimples
The Large-eddy simulations were performed to investigate the mechanism of laminar sep-aration control in a highly-loaded low-pressure turbine cascade with recessed dimples and a quasi-2D U-groove.The results show that a periodic shedding vortex is induced by the recessed dimple.The shedding vortex accelerates the formation and the breakdown of span-wise vortices,which indicates an earlier transition of the laminar boundary layer.As a result,the separation is inhabited sig-nificantly.At a condition of Reynold Number 45000,the total pressure loss is reduced by 25.4％via recessed dimple.Moreover,compared with the U-groove,the three-dimensional dimples could accelerating the transition process more effectively,and thus have a better performance in separation flow control.
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