卧式泵站直管式出水流道型线变化水力性能数值模拟

基于不可压缩流体的连续性方程和雷诺时均N-S方程,采用CFD技术对卧式泵站直管式出水流道进行数值模拟计算,通过改变出水流道型线,分析出水流道内部流动特性及水力损失影响。研究表明,出水流道当断面形状设计为圆变方,在平面方向和立面方向均逐渐扩大的形式时,流道内流态最好;将进水流道断面在平面方向设计为先扩散后平直,而在立面方向均匀扩大的形式时,流态较好;而将断面在立面与平面方向均设计成先扩散后平直时,出水流道流态最差。

Numerical Simulation of Hydraulic Performance of Straight Tube Outlet Conduit Profile in Horizontal Pumping Station

Based on the continuity equation of incompressible fluid and the Reynolds time-averaged N-S equation,the CFD technique is used to numerically simulate the straight tube outlet conduit in horizontal pumping station. By changing the outlet conduit profile,the internal flow characteristics and hydraulic loss of the water channel are analyzed. Studies show that when the cross-sectional shape of the outlet conduit is designed to be rounded and deformed,the plane direction and the elevation direction gradually enlarged,the flow pattern in the flow conduit is the best. The flow conduit section is designed to be flat in the plane direction and then flattened,and in the form of uniform expansion in the direction of the facade,the flow state is better.When the section is designed to be first diffused and flat in the direction of the facade and the plane,the flow pattern of the outlet conduit is the worst.