泵站虹吸式出水流道优化设计

对虹吸式出水流道的型线进行数学建模的基础上,开发了基于流道参数的优化设计软件,该软件能够快速进行流道型线的绘制,并能使流道的型线自动符合流速渐变的原则.结合三维紊流数值模拟对流道内流场进行三维空间的仿真,检验了流道的水力性能.建立了以虹吸式出水流道水力损失为目标函数、驼峰断面位置为求解变量的最优化问题数学模型,求解结果表明：当驼峰位于流道进口的正上方,即进口弯管段变为近似直管时,整个虹吸式出水流道的水力损失为最小.说明在设计虹吸式出水流道时,在泵站结构布置允许的条件下,驼峰的位置应尽可能向流道进口方向靠近,以减小出水流道的水力损失,提高泵装置效率.

Optimum hydraulic design for siphon outlet in large pumping stations

A mathematical model has been built for the geometric contours of siphon outlet conduit in pumping stations based on the principle of gradual rate, and the general software for hydraulic optimum design has been developed based on the geometrical parameters of outlet passage. The geometric contours of siphon outlet conduit can be drawn quickly. The hydraulic performance of siphon outlet conduit can be predicted through numerical simulation of the internal flow status of the conduit. The optimization models are established on the basis of the hydraulic loss of the conduit as the objective function and the location of the hump section of the conduit as the variable. The results indicate that the closer to the intake the hump sections of the conduit are, the less the hydraulic loss of the conduitis is. It is suggested that the location of the hump section should be close to the intake as much as possible in order to reduce the hydraulic loss.