立式混流泵站进出水流道水力优化

为得到某大型混流泵站进出水流道最优设计方案, 基于 CFX 软件, 对进出水流道内水流流态进行数值模拟研究。以泵站进出水流道初步设计方案为基础, 对流道型线进行优化研究: 通过调整进水流道断面参数, 得出进水流道优化方案; 通过改变虹吸式出水流道上升角与下降角, 得到水力损失最小的出水流道型式。最终结果表明: 当进水流道流速和流道长度、断面面积和流道长度的关系曲线光滑无突变时, 流道内无不良流态, 符合优化设计要求; 当出水流道上升角为22°下降角为 29°时, 泵站出水流道流速分布较为均匀、水力损失最小。由此得出所选泵站最优设计方案。所得结果对大中型泵站的流道优化有指导作用。

Hydraulic optimization of inlet and outlet passages of vertical mixed flow pumping station

In order to obtain the optimal design scheme of the inlet and outlet passages of a large vertical mixed flow pumping station, the numerical simulation of the flow pattern in the inlet and outlet passages is carried out using the CFX software. Based on the preliminary design scheme of the inlet and outlet passages of the pumping station, the inlet passage optimization scheme is obtained by adjusting the section parameters of the inlet passage. The optimum design scheme is determined by changing the rising and falling angles of the siphon outlet passages. The final results show that: when the relationship between the inlet passage flow velocity and the length of the passage, the section area and the length of the passage is smooth and there is no sudden change, indicating that it meets the optimization design requirements, likewise, the rising angle of the outlet passage is 22 degrees and the falling angle is 29 degrees, respectively, the velocity distribution of the outlet passage is more uniform and the hydraulic loss is the smallest . T he results obtained can be used to guide the passage optimization of large and medium-sized pumping stations.