农业工程学报Issue(9)：71-76,6.DOI:10.11975/j.issn.1002-6819.2015.09.012
斜流泵叶轮水力径向力的数值模拟与试验验证
Numerical simulation and experimental validation on hydrodynamic radial force of mixed-flow pump impeller
摘要
Abstract
This paper presents a numerical investigation of hydrodynamic radial force of mixed-flow pump, through validations and CFD simulations under several flow rates, the global performances of the mixed-flow pump is accurately predicted with RNG k-ε turbulence model, the head prediction error is less than 4.4% under all the operational conditions. The recirculation between the impeller and diffuser dominates the flow passage at part-load conditions, the pressure amplitude at 4 times shaft frequency was bigger than other frequencies, it increased sharply while the flow rate changed from 0.6 to 0.4 nominal flow rate, these demonstrated that the rotor-stator impeller blade passing excitation strengthened the pressure amplitudes of points between the impeller and diffuser under part-load conditions. The transient hydrodynamic radial forces of impeller present a periodicity change with time, the average value of transient radial force is close to zero under a uniform inflow condition. The FFT spectrum analysis of radial forces demonstrated that the amplitude of hydrodynamic radial forces under part-load conditions are much higher than nominal condition, especially at 1 time and 4 times shaft frequency, these phenomena are mainly attributed to the hydraulic imbalance of rotor, rotor-stator impeller blade passing excitation, rotor-stator blade interaction excitation and etc. Based on the analysis above, it is concluded that the recirculation flow pattern under part-load conditions has a significant influence on pressure fluctuation and hydrodynamic radial force.关键词
泵/叶轮/光谱分析/水力径向力/斜流泵/动静干涉/回流涡旋/小流量工况Key words
pumps/impellers/spectrum analysis/hydrodynamic radial force/mixed-flow pump/rotor-stator interaction/recirculation/part-load condition分类
机械制造引用本文复制引用
欧鸣雄,施卫东,贾卫东,付强..斜流泵叶轮水力径向力的数值模拟与试验验证[J].农业工程学报,2015,(9):71-76,6.基金项目
National Natural Science Foundation of China (51475215,51275215) （51475215,51275215）
Scientific Research Foundation of Jiangsu University (14JDG030) （14JDG030）
A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) （PAPD）
