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通过数值模拟来研究和分析某环形叶栅轮毂壁面旋转对静子叶根角区流动结构的影响.研究结果表明:轮毂正向转动可以减小叶栅端壁区的流动堵塞,轮毂端壁角区的流动结构由三维分离流动结构转变为泄漏涡占主导的端壁分离结构.轮毂壁面旋转带来的叶栅角区流动结构的变化根本原因在于端壁转动引起的叶栅根部间隙泄漏增强,阻碍了轮毂端壁附面层二次流向叶片吸力面角区的堆积.
The numerical simulation is used to study and analyze the influence of the rotation of a circular cascade hub on the flow field in the root zone of the stator. The results show that the forward rotation of the hub can reduce the flow blockage in the endwall area of the cascade, The flow structure changes from three-dimensional separation flow structure to the end-wall separation structure dominated by leakage vortex.The fundamental reason for the variation of the flow structure in the cascade corner zone caused by the rotation of the hub wall wall is that the blade root gap leakage caused by the rotation of the end wall increases, Accumulation of secondary flow to the suction surface of blade at the end wall of the hub.