The two-way counter-rotation technology is mainly applied to the tidal power station. In this paper, the hydrodynamic optimization of the two-way counter-rotating axial-flow pump turbine is carried out. Under the premise of realizing the forward and reverse power generation and the forward and negative pumping basic function, it has important engineering significance and academic value for improving the pump turbine performance of various working conditions. The main contents are as follows: hydraulic design of “S”-shaped blade for the two-way counter-rotating axial-flow pump turbine is conducted, and the influence of the gap between different impeller stages on the performance is calculated and analyzed, and the variation law of head and efficiency of the pump turbine under different inter-stage clearances is obtained. And the influence of the inter-stage gap on the unit is summarized from the vorticity distribution and the axial section pressure cloud diagram analysis, and the range of the best inter-stage gap of the unit performance is determined.

双向反向旋转技术主要应用于潮汐发电站。本文对双向反向旋转轴流泵水轮机进行了水力优化。在实现正反转发电和正负抽水基本功能的前提下，对于改善各种工况下的水轮机性能具有重要的工程意义和学术价值。主要内容如下：进行了双向双向轴流泵水轮机“ S”形叶片的水力设计，计算并分析了叶轮级间间隙对性能的影响，得到了不同级间间隙下水轮机扬程和效率的变化规律。