高流速泄洪隧洞水力特性的三维数值模拟

Three Dimensional Numerical Simulation of Hydraulic Characteristics of Spillway Tunnel with High Flow Velocity

结合新疆某水利枢纽工程中的中孔泄洪隧洞,采用有限体积法,运用FLUENT软件,将k-ε紊流模型与VOF方法相结合,用交错网格的SIMPLE法,三维数值模拟了中孔泄洪隧洞的水力特性。将数值计算结果与模型实验实测值进行对比,二者吻合较好,表明采用的数学模型和经验参数基本正确。模拟结果表明原设计方案的洞截面尺寸、洞顶高程均满足泄流要求。掺气挑坎段水力特性符合设计要求。

The medium hole spillway tunnel in the water conservancy multi-perpose project in Xinjiang were designed by using the finit volume method,ELUENT with VOF method and apply the crossbedding mesh SIMPLE method,and the hydraulie characteristics of medium hole spillway tunnel were simulated with three dimentional numerical value.When the numerical calculated result and measured value of model test were compared with each other.It was found that there were nearly no differences between the two,which indicated that the mathematical model and experience parameters used in this paper were correct.In addition,the simulation results showed that the tunnel section size of the original designed proposal and the top elevation of spillway tunnel both could meet the requirements of water discharge,the hydrautic characteristics in aeration bucket block also were accordant with designed demand.