以西藏大学农牧学院自建水电站中某根压力钢管为例，用AUTOCAD 2004建立了压力钢管三维模型，在GAMBIT软件中划分网格后，选取Realizable κ-ε湍流模型，边界条件为压力进口和速度出口，借助计算流体动力学软件FLUENT ，采用对整根压力钢管在水轮机额定工况时的内部流场进行了三维数值仿真模拟，获得了内部流场压力和流速分布情况，同时对弯折处的压力和流速进行了分析。结果表明因为离心力作用使压力钢管弯折处上端压力比下端压力大。Realizable κ-ε湍流模型在对压力钢管流场模拟方面所得到的值与电厂压力表比较吻合，Realizable κ-ε湍流模型选取合适。据此得到了压力钢管在设计时应尽量采取小角度弯折连接的结论。%Taking a penstock of the hydropower station built by Agriculture and Animal Husbandry College of Tibet Uni-versity as an example ,a 3D model of the penstock was established with AUTOCAD 2004 ,then meshed by the GAMBIT software .The Realizable κ-εturbulence model was selected with pressure-inlet and velocity-outlet as the boundary con-ditions .The computational fluid dynamics software FLUENT was used to simulate the internal flow field of the whole pen-stock when the water turbine operated at rated conditions ,through which the pressure and velocity distribution of the in-ternal flow field were gained .At the same time ,the pressure and velocity of bending position were analyzed in detail .It was summed up that the pressure of the penstock of the bending point was greater than that of the lower end because of the centrifugal force .Realizable κ-εturbulence model were compared in the simulation of plateau penstock with plant instrumentations .Realizable κ-εturbulence model were suitable for the simulation .Accordingly ,come to a conclusion that when designing penstocks we should adopt the small angle bending at the connection joints .
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