排灌机械工程学报
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排灌机械工程学报  2012, Vol. 30 Issue (3): 289-294    DOI: 10.3969/j.issn.1674-8530.2012.03.009
泵理论与技术 最新目录 | 下期目录 | 过刊浏览 | 高级检索 Previous Articles  |  Next Articles  
螺旋离心泵叶片变螺距型线方程
程效锐, 李仁年, 黎义斌, 范赢, 申立新
(兰州理工大学能源与动力工程学院, 甘肃 兰州 730050)
Variable pitch profile equation of screw centrifugal pump

(School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China)
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摘要 根据螺旋离心泵的结构特点,基于叶片式流体机械内固液两相双流体模型的流速比理论,分析了螺旋离心泵叶片型线的螺距变化规律,推导出固液两相流螺旋离心泵叶片变螺距型线的参数方程.依据给定的设计参数和固相体积分数,采用推导出的叶片型线方程设计出叶片型线,并生成叶片三维模型,叶片表面光滑平整.对该叶片形成的水力模型进行了外特性清水试验,并用该三维模型对固相体积分数分别为5%,10%和15%时的固液两相流动进行了数值分析.结果表明:介质为固液两相流时泵的效率较输送清水介质时有所提高,特别是在设计工况,当固相体积分数等于设计给定值时,泵的效率可提高85%;当偏离给定的固相体积分数值时,效率有所降低;在输送固液两相流介质时泵的扬程较输送清水时的扬程有所降低,且随着固相体积分数的增大扬程逐渐降低.
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程效锐
李仁年
黎义斌
范赢
申立新
关键词螺旋离心泵   固液两相流   叶片型线方程   变螺距   数值模拟     
Abstract: According to the structure characteristics of impeller of a screw centrifugal pump, the streamwise evolutionary pattern of blade pitch was analyzed by applying the theory of relative velocity ratio of liquidsolid twophase flow model for an impeller pump, and then a parametric equation for variablepitch was deduced. For the given hydraulic performance parameters and a volume fraction of the solid phase at the design point, a smooth, threedimensional blade profile could be established through the parametric equations.The water performance of a screw centrifugal pump whose blades were designed in that way was measured, and accordingly its performances of liquidsolid twophase flow were estimated numerically at three volume fractions of 5%, 15% and 25% with a CFD code, respectively. The results show that the pump efficiency for transporting solidliquid twophase medium is better than for transporting water. At the design point, for a given volume fraction of solid phase, the pump efficiency is increased by 8.5%; however, when the volume fraction is different from that given value, the pump efficiency is reduced.Compared with water single phase flow, the pump head of liquidsolid twophase flow is not only decreased, and but also lowered gradually with increasing solidphase concentration.
Key wordsscrew centrifugal pump   liquid solid two phase flow   blade profile equation   variablepitch   numerical simulation   
收稿日期: 2011-10-06; 出版日期: 2012-04-10
基金资助:

国家自然科学基金资助项目(51079066)

通讯作者: 程效锐(1972—),男,甘肃兰州人,讲师,博士研究生(cxr168861@lut.cn),主要从事流体机械数值模拟及优化设计研究.    
作者简介: 李仁年(1963—),男,甘肃武威人,教授,博士生导师(通信作者,lirn@lut.cn),主要从事流体机械理论及应用研究.
引用本文:   
程效锐,李仁年,黎义斌等. 螺旋离心泵叶片变螺距型线方程[J]. 排灌机械工程学报, 2012, 30(3): 289-294.
CHENG Xiao-Rui,LI Ren-Nian,LI Yi-Bin et al. Variable pitch profile equation of screw centrifugal pump[J]. Journal of Drainage and Irrigation Machinery Engin, 2012, 30(3): 289-294.
 
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