水利水电科技进展2026，Vol.46Issue(3)：42-50,9.DOI:10.3880/j.issn.1006-7647.2026.03.006
开阀时间对混流泵停机过程瞬态水力特性的影响研究
Research on influence of valve opening time on transient hydraulic characteristics of a mixed-flow pump during shutdown process
摘要
Abstract
To investigate the effects of opening time of vacuum breaking valve on transient hydraulic characteristics of a mixed-flow pump unit during the shutdown process,a full-flow geometric model of the pump unit was established.The actual vacuum breaking valve device was simplified into a ball valve model with equivalent flow area,and the coupling of ball valve opening-closing motion and impeller rotation was realized by the dynamic mesh technology.Three schemes with different valve opening times were designed,namely the advanced opening scheme,the synchronous opening scheme,and the delayed opening scheme.Three-dimensional numerical simulations of the shutdown transient process were carried out.The influence mechanism of valve opening time on hydraulic stability during the shutdown process was explored from three aspects:external performance,pressure fluctuation characteristics,and internal flow characteristics.Combined with the entropy production theory,the energy dissipation law during the shutdown process was revealed.The results show that the external performance parameters,pressure fluctuation and internal flow field evolution present similar variation tendencies under different valve opening schemes,while differences exist in temporal evolution process and variation amplitude.The opening time of the valve exerts remarkable impacts on the transient performance of the unit.Compared with the synchronous opening scheme,the advanced opening scheme reduces the peak values of torque and axial force,yet it may induce more severe initial hydraulic impact.In contrast,the delayed opening scheme delays the operating condition transition,which makes the reverse extreme values of torque and axial force increase to 1.26 times and 1.21 times those of the synchronous opening scheme,respectively,and amplifies the pressure fluctuation amplitude at the siphon crown.Moreover,the delayed opening scheme significantly increases the hydraulic energy loss in the impeller region.In summary,the synchronous opening scheme can effectively suppress hydraulic oscillation,reduce load impact and energy loss while maintaining favorable shutdown efficiency,which is the optimal strategy for stable shutdown of the pump unit.关键词
混流泵机组/停机过程/水力特性/球阀/三维数值模拟/熵产理论Key words
mixed-flow pump unit/shutdown process/hydraulic characteristics/ball valve/three-dimensional numerical simulation/entropy production theory引用本文复制引用
陈会向,吴伟松,王楚怡,冯建刚,黄富佳,夏臣智,阚阚,徐辉..开阀时间对混流泵停机过程瞬态水力特性的影响研究[J].水利水电科技进展,2026,46(3):42-50,9.基金项目
国家自然科学基金项目(52476028,52379086) （52476028,52379086）
江苏省创新支撑计划国际科技合作项目(BZ2023047) （BZ2023047）
