中国机械工程2016，Vol.27Issue(11)：1516-1522,7.DOI:10.3969/j.issn.1004-132X.2016.11.018
包角对中比转速泵流场及无过载性能的影响
Effects of Vane Wrap Angle on Flow Field and Non-overload Performance for Medium Specific Speed Pumps
摘要
Abstract
To identify the effects of vane wrap angle for medium specific speed pumps,the centrif-ugal pump of D82-19-2 was chosen as the research subject.The design scheme of impeller and four im-pellers with vane wrap angle of 150°,170°,190°and 210°respectively were ascertained according to non-overload impeller constraint formula.The flow field and non-overload performance of the pumps were obtained by numerical simulations.By compared with experimental results,the deviations of simulated head,efficiency and power values are less than 9%,and the accuracy of simulation results was verified.The results show that with the increasing vane wrap angle from 150°to 210°,the inlet pressures of impeller increase by 24%,and low-velocity areas expand to one-third of the whole run-ner,that is,the fluid constraint ability and cavitation resistance have enhanced.However,the outlet pressures of impeller reduce and the kinetic energy losses aggravate for larger wrap angle.Meanwhile, the power reserve factor decreases from 1.145 to 1.025,and the extreme point of shaft power curve appears,so that non-overload characteristics of pump are more significant for larger wrap angle.But the pump head and efficiencies decrease by 15.4% and 4.48% respectively.The results may provide theoretical bases for non-overload design of medium specific speed centrifugal pumps.关键词
中比转速/离心泵/无过载/包角Key words
medium specific speed/centrifugal pump/non-overload/wrap angle分类
机械制造引用本文复制引用
马艺,马中强,张生昌,王新华..包角对中比转速泵流场及无过载性能的影响[J].中国机械工程,2016,27(11):1516-1522,7.基金项目
国家科技支撑计划资助项目(2013BAF01B01) （2013BAF01B01）
国家自然科学基金资助项目(51406183) （51406183）
