排灌机械工程学报2017，Vol.35Issue(8)：666-673,699,9.DOI:10.3969/j.issn.1674-8530.16.0042
叶片数对混流泵内部非定常压力脉动特性的影响
Influence of different blade numbers on unsteady pressure pulsationsof internal flow field in mixed-flow pump
摘要
Abstract
In order to study the internal flow field pressure distributions of mixed-flow pump with diffe-rent numbers of impeller blades over time, the unsteady numerical analysis on mixed-flow pump based on LES model is carried out, and hydraulic characteristic between two kinds of blade number in mixed-flow pump, inlet and outlet of axial velocity distribution of impeller,time domain and frequency domain response of the pressure pulsation at different monitoring points in the mixed-flow pump are all compared.The results show that the inlet and outlet axial velocities are greatly influenced by the number of blades.With the increase of flow rate, the different value of inlet axial velocity between four blade impellers and three blade impellers decreases gradually, and the latter has higher axial velocity in impeller inlet;apparent periodic variation in time domain graph as well as steady pulse amplitude curves are shown in two kinds of impeller.Cp, the outlet pressure pulsation amplitude of guide blade, tends to 0 while the pressure pulsation in the hub of four blade impeller is aperiodic.The main frequencies near the impeller in mixed-flow pump under three or four blades are both blade frequency.The pressure pulsation frequency domain amplitude is greater in three vane impeller than that in four vane impeller.The results are of significant reference for design optimization and revealing the unsteady internal flow characteristics with different blade numbers of mixed-flow pump.关键词
混流泵/压力脉动/轴向速度/时域/频域Key words
mixed-flow pump/pressure pulsation/axial velocity/time domain/frequency domain分类
机械制造引用本文复制引用
季磊磊,李伟,施卫东,邵佩佩,蒋小平..叶片数对混流泵内部非定常压力脉动特性的影响[J].排灌机械工程学报,2017,35(8):666-673,699,9.基金项目
国家自然科学基金资助项目(51409127) （51409127）
江苏省重点研发计划项目(BE2015119,BE2015001-4) （BE2015119,BE2015001-4）
江苏省六大人才高峰项目(HYZB-002) （HYZB-002）
镇江市农业支撑项目(NY2013031) （NY2013031）
江苏高校优势学科建设工程项目 （）
江苏大学高级专业人才科研启动基金资助项目(13JDG105) （13JDG105）
