【摘要】 安装 Kaplan水轮机的低水头水电站 ,轴向水推力是一个重要的设计和安全运行指标。为精确计算过渡过程的轴向水推力 ,除用叉管理论以分节集中模拟蜗壳圆周分流的方法 ,以计及蜗壳的影响来提高过渡过程计算精度外 ,还利用螺旋桨理论 ,对过渡过程机组桨叶划水产生的轴向水推力进行模拟计算。讨论了各种因素对轴向水推力的影响 ,包括各项推力系数的选取和修正。计算结果接近目前的实测资料 ,说明此计算模型是简单、合理、有效的更多还原

【Abstract】 The axial thrust is an important indicator for design and safety consideration in hydroelectric power stations using Kaplan turbines. During transients in hydropower stations, the axial thrust is influenced by many factors including water hammer and rotation speed and is difficult to describe preciously. The bifurcation principle is used in the present work to analyze the spiral case as a piping system with branches that each divert part of the flow as it goes around the periphery of the runner. This analytical approach improves the computational precision. Screw propeller theory is then used to calculate the axial thrust and to analyze factors that influence the thrust. The calculated results agree well with those obtained experimentally.更多还原