混流式水轮机引水、导水部件内部固液两相流动的数值分析  

Numerical analysis of inner solid-liquid two-phase flow in diversion and guiding apparatus in Francis turbine

作　　者：李琪飞[1] 李仁年[1] 韩伟[1] 敏政[1] 

机构地区：[1]兰州理工大学流体动力与控制学院,甘肃兰州730050

出　　处：《兰州理工大学学报》2008年第6期47-50,共4页Journal of Lanzhou University of Technology

摘　　要：基于N-S方程，运用k-ε-Ap模型，采用直角坐标系、混合四面体非结构网格和SIMPLE算法，将混流式水轮机蜗壳、固定导叶和活动导叶作为耦合整体，对引水、导水部件在含沙水两相流介质流动时的内部流场进行数值模拟计算．分析水轮机引水、导水部件内部流场两相流动的机理，对泥沙两相流动时蜗壳、固定导叶和活动导叶等部件的泥沙磨损进行分析和预测．研究结果表明，蜗壳包角从0°～320°的外侧壁、特殊固定导叶的头部及工作面靠近头部位置、活动导叶头部及工作面靠近头尾部的区域，属于磨损严重区域，与水电站的实际磨损情况基本吻合．Based on the Navier-Stokes equation, k-ε-Ap turbulence model, tetrahedral unstructured grids system in Cartesian coordinates, and SIMPLE algorithm and taking the spiral casing, stay vanes, and guide vanes of Francis turbine as a whole, the numeric simulation was performed for the inner flow field of sand-laden two-phase flow in the flow passage of diversion and guiding vanes. The infler flow mechanism of the solid-liquid two-phase medium was analyzed and the silt-wear of the spiral casing, stay vanes, and guide vanes in the sandy two-phase flow was analyzed and predicted, also. The simulation results showed that such regions as sidewall of spiral case from wrap angle of 0° to 320°, the leading edge and pressure side near it of the special stay vane and guide vane, the pressure side near the trailing edge of guide vane were eroded seriously, being basically consistent with the actual erosion case in hydropower plants.

关 键 词：水轮机 引水 导水部件 内部流场 固液两相流动 数值模拟 

分 类 号：TH730[机械工程—仪器科学与技术]