低比转速叶轮叶片数的选择准则  

Criteria of blade number selection for low specific speed impeller

作　　者：严敬[1] 潘光玉[1] 阚能琪[1] 王桃[1] 

机构地区：[1]西华大学能源与环境学院,四川成都610039

出　　处：《排灌机械》2008年第1期18-20,共3页Drainage and Irrigation Machinery

摘　　要：离心叶轮叶片数的正确选择是提高叶轮水力性能的重要措施.通过考查国外最新速度系数法设计资料和分析影响叶轮流道脱流和园盘摩擦损失的多种因素,提出了与传统观点相反的结论:增加低比转速离心叶轮叶片,并不是改善叶轮水力性能的有效途径,在合理选定叶片包角、叶轮出口宽度及优化叶轮直径的条件下,适当降低低比转速叶轮叶片数,对提高叶轮水力效率、消除离心泵的特征曲线的驼峰都有重要意义.这一新观点为设计人员正确确定低比转速叶轮叶片数提供了重要参考.Correct selection of blade number is of vital importance to improve the impeller hydraulic performance. By studying latest data presented by foreign experts and analyzing various factors influencing flow separation and disc friction, the authors draw a conclusion which is opposite to the traditional view： increasing blade number is not an effective way to improve impeller hydraulic performance; instead, after determining wrapping angle of blade, width of impeller at exit and optimizing impeller discharge diameter, reducing blade number to some extent will be beneficial to raise impeller hydraulic efficiency and eliminating hump of pump head-capacity curve. The new theorem provides valuable reference for impeller designers in determining blade number of low specific speed impellers.

关 键 词：离心泵 低比转速 叶轮 设计 叶片 

分 类 号：TH31[机械工程—机械制造及自动化]