通过大涡模拟方法研究了球窝对低雷诺数下高负荷低压涡轮叶栅吸力侧层流分离的抑制效果和抑制机理，并将其和准二维的U 型槽结构进行了对比分析。研究发现，低雷诺数下球窝通过产生周期性脱落的旋涡结构有效地促进了分离剪切层内展向涡的卷起和破碎，促进了转捩进程，因而可以有效抑制分离，在45000 雷诺数下使损失相对减小了25.4%。同时和准二维结构相比，球窝产生的三维流动结构可以更有效地促进转捩进程，具有更好的流动控制效果。

The Large-eddy simulations were performed to investigate the mechanism of laminar separation 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 significantly. 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.