摘要
针对多级离心泵中浮动叶轮轴向振荡会导致前、后盘腔容积损失率和内部流场变化的问题,构建动网格及多重参考坐标系耦合数值模拟方法,实现叶轮同时轴向运动和旋转,分析了叶轮轴向振荡对前、后盘腔容积损失率的变化及内部流场分布的影响。结果表明,瞬态水力性能受到叶轮轴向简谐振荡的显著影响,且内部流场反应滞后于叶轮运动。在一个振荡周期内,前、后盘腔的容积损失率范围分别为9.00%~13.42%和1.67%~3.54%。叶轮轴向振荡对前盘腔内圆周速度的影响比后盘腔大,对前、后盘腔轴面流线均有较大影响。叶轮轴向振荡没有明显改变前、后盘腔的压力分布,但改变了前、后盘腔的流动阻力,导致泄漏量非定常变化。前盘腔内涡旋随着叶轮轴向振荡位置变化表现出不同响应特性。该研究为减小多级离心泵容积损失及运行稳定性提供参考。
Here,aiming at the problem of axial oscillation of floating impeller in multi-stage centrifugal pump,which can cause volume loss and internal flow field changes in front and rear disc chambers,a dynamic grid-multiple reference frames coupled numerical simulation method was constructed to realize simultaneous axial motion and rotating of impeller.Effects of impeller axial oscillation on volume loss rates and flow field distributions of front and rear disc chambers were analyzed.The results showed that transient hydraulic performance is significantly affected by axial harmonic oscillation of impeller,and flow field response lags behind impeller motion;within one oscillation cycle,volume loss rates of front and rear disc chambers range from 9.00%-13.42%and 1.67%-3.54%,respectively;effects of impeller axial oscillation on circumferential velocity in front cavity are larger than those in rear cavity,and it significantly affects axial streamlines in both cavities;impeller axial oscillation does not obviously change pressure distributions in front and rear disc chambers,but changes flow resistances in front and rear disc chambers to cause leakage unsteady changes;vortexes inside front disc cavity exhibit different response characteristics with change of impeller axial oscillation position.This study can provide a reference for reducing volume loss and improving operational stability of multi-stage centrifugal pumps.
作者
顾延东
杨正印
王梦成
卞君杰
王鹏
袁寿其
GU Yandong;YANG Zhengyin;WANG Mengcheng;BIAN Junjie;WANG Peng;YUAN Shouqi(College of Hydraulic Science and Engineering,Yangzhou University,Yangzhou 225009,China;College of Electrical,Energy and Power Engineering,Yangzhou University,Yangzhou 225009,China;National Pump and System Engineering Technology Research Center,Jiangsu University,Zhenjiang 212013,China)
出处
《振动与冲击》
北大核心
2025年第17期1-9,共9页
Journal of Vibration and Shock
基金
国家自然科学基金(52206055)
江苏省高等学校基础科学(自然科学)研究面上项目(22KJB570005)
苏高校优势学科建设工程资助项目(PAPD)。
关键词
多级离心泵
叶轮振荡
数值模拟
泄漏
multi-stage centrifugal pump
impeller oscillation
numerical simulation
leakage
