开敞式双向泵装置出水锥管的优化设计

Optimal Design of Outlet Conical Pipe for Open Dual-Directional Pumping System

为满足排涝和抽引双重功能,节省土建投资,并且考虑到两种工况下设计扬程和校核扬程相差较大,新建的澡港泵站采用了开敞式双向流道泵装置结构型式,在大多数引水工况下,出水流道的顶板不被淹没,流道内具有自由表面。在分析澡港泵站开敞式双向进出水流道设计特点的基础上,运用计算流体动力学方法,对进水流道、叶轮、导叶、出水流道及门槽等进行了全流道内部流动数值仿真,对出水锥管进行了水力设计优化和装置性能预测。通过多方案比较出水流道的水力损失和装置效率,优化出水锥管设计参数。在设计工况下,优化设计方案对应的装置效率达到了66.05%,优化设计效果明显,有效地提高了澡港泵站的工程效益。

In order to meet the double functions of irrigation and drainage and to save civil construction investment ,dual-direc-tional pumping system was adopted in the newly-built Zaogang pumping station ,considering the large difference between the de-sign and check head under the irrigation and drainage conditions .Under most of the irrigation conditions ,the crest slab will not be submerged with free water surface .Based on the analysis on the design features of dual-directional inlet and outlet passages of Zaogang pumping station ,the method of computational fluid dynamics was applied to perform numerical simulations on the internal flow of full passages including inlet and outlet passages ,impeller ,guide vanes ,and gate slots ,and the optimal hydraulic design of outlet conical pipe and the prediction of pumping system performance were conducted .The hydraulic losses of outlet passage and system efficiency were compared for different schemes and the design parameters of outlet conical pipe were opti-mized .Under the design conditions ,the pumping system efficiency of the optimal scheme has reached 66 .05% ,which can effec-tively improve the engineering benefits of Zaogang pumping station .