泵站进水系统三维水动力特性数值模拟研究  

Three-dimensional numerical simulation of hydrodynamic characteristics in the inlet system in pumping station

作　　者：南江江[1] 朱斌 NAN Jiangjiang;ZHU Bin(Shanxi Hydroelectricity Investigation and Design Institute Co.,Ltd,Taiyuan 030024,China;Shanxi Yumenkou Yellow River Diversion Water Group Co.,Ltd,Hejin 043300,China)

机构地区：[1]山西省水利水电勘测设计研究院有限公司,太原030024 [2]山西禹门口引黄水务集团有限公司,山西河津043300

出　　处：《灌溉排水学报》2024年第5期38-44,共7页Journal of Irrigation and Drainage

摘　　要：【目的】研究泵站进水系统结构对水泵进水流场的影响。【方法】基于Fluent平台,假定水流为不可压缩湍流流体,在满足连续方程和动量方程的基础上,引入RNGk-ε紊流模型,对改造前后泵站进水系统进行了数值模拟,采用适于稳态流场的收敛速度更快的SIMPLEC算法,利用有限体积法进行空间离散求解,分析了不同断面的流场流速、流速旋角及流线分布,对比分析了改造前后泵站进水系统的水动力指标。【结果】改造方案各水动力指标均小于改造前方案,进水池流速标准差减小了6%~64%,进水管进口流速标准差降低了41%~96%,平均流速旋角减小了60%~73%,流速旋角标准差降低了59%~72%,水流流态分布趋向均匀,水泵进水条件明显改善。【结论】改造后泵站进水系统流速分布较均匀,流态趋于平稳,对减轻泵站机组汽蚀破坏有重要意义。【Objective】Hydrodynamics in the inlet system of the pumping station plays a pivotal role in its operation.This paper investigates the variation in flow characteristic in a modified pumping station using numerical simulation.【Method】We used the Fluent software,assuming water flow was incompressible and turbulent.The turbulence was modelled by the RNG k-emodel.The discretized equation was solved by the SIMPLEC algorithm.The flow velocity,rotation angle and streamline distribution of flow field at different sections in the original and the modified pumping stations were compared.【Result】The hydrodynamic characteristic in the renovation plan in the modified pumping station was smaller than those in the renovation plan in the original pumping station.Compared to the convention pumping station,the modified one reduced the standard deviation of the inlet pool flow rate by 6%-64%,the standard deviation of the inlet pipe flow rate by 41%-96%,the average flow rate rotation angle by 60%-73%,the standard deviation of the flow rate rotation angle by 59%-72%.The distribution of water flow patterns in the modified pumping station was more uniform,and the inlet condition was also significantly improved.【Conclusion】The modification improved the uniformity of the flow velocity distribution in the inlet system of the pump station,thereby improving the stability of the flow pattern.These combined to significantly reduce the potential cavitation damage to the pumping station.

关 键 词：泵站 进水系统 数值模拟 流场分析 流态改善 

分 类 号：TV131.2[水利工程—水力学及河流动力学]