【摘要】 根据加速旋转相对坐标系中雷诺时均的连续性方程和Navier-stokes方程,以及转动系统的动量矩方程,推导了水轮机转轮区域的流动控制方程。采用RNGk-ε湍流模型对基于HL220进行改型的混流式水轮机在9种开度下进行飞逸暂态过程的三维非定常数值模拟,着重对尾水管内的流动进行了分析,得到了尾水管中心投影面压力分布随时间的变化情况,以及水轮机内部各测点的压力脉动。更多还原

【Abstract】 Based on the Reynolds-averaged continuity and Navier-Stokes equations,and the moment equation of the rotation system in the accelerated rotary relative coordinate,the governing equations of flow in the runner region are obtained.The runaway transients simulation of the Francis turbine based on HL220 is made with RNG k-ε turbulence models under 9 gate openings,detailed analysis is focused on the flow in the draft tube to get variation of pressure distribution on projective surface against time and pressure fluctuation of all test points in the turbine.更多还原