贯流式机组桨叶与导叶全三维联合设计

为了充分反映水流经过导叶后的流态对桨叶入流的影响,本文建立了灯泡贯流式机组桨叶和导叶的全三维联合反问题计算模型。在包括桨叶和导叶的计算域中,求解联立的控制方程,同时设计得到了导叶和桨叶的空间叶型。采用联合设计和单独设计模型分别设计了一低水头贯流式机组的桨叶和导叶,并在设计工况下对其进行了全流道湍流数值模拟。性能预估结果表明,与单独设计相比,联合设计的桨叶进口边附近压力分布得到改善,导叶和桨叶段的联合损失减小,转轮效率提高。

Three-dimensional coupled design for runner blades and guide vanes of tubular turbine

In this paper a full three-dimensional coupled design model for runner blades and guide vanes of bulb tubular turbine is developed to simulate behaviors of guide vane wake flow that has significant influence on the inflow of runner blades.The runner blade and guide vane are designed together with simultaneous solution of equations for a flow domain that covers both blades.A design of low-head tubular turbine is worked out by the coupled model and a separate model,respectively,and a numerical simulation of turbulent flow is made for the design operation mode.Performance prediction indicates that the static pressure distribution on the leading edge of runner blades designed by the coupled model is better than that by the separate model,and that the hydraulic loss is lower and the runner’s efficiency is higher.