泵站出水流道基本流态分析

为了改进泵站出水流道的水力设计方法，采用三维紊流数值模拟的方法，模拟了虹吸式、直管式和斜式三种型式出水流道内的流动形态；发现出水流道平面方向上的扩散情况较好，而立面方向在出口断面附近则不同程度地存在着旋涡，该旋涡对流道出口断面的流速分布有很明显的影响；提出在流道设计时应最大限度地利用流道宽度方向的扩散，以免出口断面的有效面积过多地被旋涡挤占。

Analysis of flow pattern in outlet conduit of pumping station

In order to improve the hydraulic design of outlet conduit, the basic flow patterns in outlet conduits including siphon, straight tube and inclined conduit are simulated by numerical computation of 3-D turbulent. It is found that the diffusion in horizontal direction is better than that along the vertical direction, since vortex is existed. The vortex influences the velocity distribution at the section. It is suggested that the diffusion in the horizontal direction of the conduit should be utilized to restrain the effect of the vortex.