排灌机械工程学报
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排灌机械工程学报  2014, Vol. 32 Issue (1): 12-16    DOI: 10.3969/j.issn.1674-8530.12.0226
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  
离心泵反转作液力透平的力学特性
杨军虎, 李海龙, 龚朝晖, 夏书强, 罗凯凯
兰州理工大学能源与动力工程学院, 甘肃 兰州 730050
Radial thrust behavior in centrifugal pump as hydro-turbine
Yang Junhu, Li Hailong, Gong Zhaohui, Xia Shuqiang, Luo Kaikai
School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China
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摘要 以一台比转数为84.5的离心泵为研究对象,应用CFD软件对该泵作液力透平时的内部流场进行数值模拟,建立相对坐标系下的连续方程和时均Navier-Stokes方程,采用标准k-ε湍流模型和SIMPLEC算法分别对泵工况和液力透平工况进行数值模拟,得到2种工况下在不同流量时的径向力.通过对比泵工况下径向力的数值计算值和Stepanoff公式计算值,发现两者径向力大小比较吻合,表明数值模拟建立的径向力计算模型是正确的.数值模拟结果表明:液力透平工况时的最高效率比泵工况时的最高效率低约5.4%;在相同流量下透平工况时径向力普遍小于泵工况时的径向力;透平工况时径向力的大小随流量的增大而增大;当流量小于设计流量的1.1倍时,随着流量的增大,液力透平工况时径向力的方向和隔舌的夹角从146°减小到125°,但当流量大于设计流量的1.1倍时,其与隔舌的夹角随流量的增大而增大,在1.4倍的设计流量时其夹角达到144°.通过计算和实例表明在透平工况下运行时,泵轴强度仍然满足使用要求.
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杨军虎
李海龙
龚朝晖
夏书强
罗凯凯
关键词离心泵   液力透平   径向力   数值模拟   强度校核     
Abstract: The internal flow field in a centrifugal pump with specific speed of 84.5 was numerically simulated by using CFD method when it was operated as a pump and run reversely as a hydro-turbine. The Rey-nolds time-averaged Navier-Stokes equations, standard k-ε two-equation turbulence model and SIMPLEC method were adopted in the simulations. The radial thrust was calculated under different flow conditions in that both modes. It was confirmed that the radial thrusts predicted in pump mode is in good agreement with those estimated by means of the Stepanoff empirical correlation, suggesting the flow models adopted are correct and reasonable. It was shown that the best efficiency in turbine mode is lower than the pump mode by about 5.4% and the radial thrust in the turbine mode is always smaller than the pump mode at the same flow rate. In the turbine mode, the radial thrust rises with increasing flow rate. The angle of radial thrust vector measured from the volute tongue is reduced to 125° from 146° as flow rate increase up to 1.1 times the design flow rate in the turbine mode. When flow rate is higher than 1.1 times the design flow rate, however, the angle is increased with increasing flow rate. As a result, the angle is as large as 144° at 1.4 times the design flow rate. The results suggest that the strength of the pump shaft is strong enough and still can meet the requirement of operation in the turbine mode.
Key wordscentrifugal pump   hydraulic turbine   radial force   numerical simulation   strength check   
收稿日期: 2012-12-24;
基金资助:

“十二五”国家科技支撑计划项目(2012BAA08B05);国家自然科学基金资助项目(51169010)

通讯作者: 杨军虎(1962—),男,陕西蒲城人,教授,博士生导师(lzyangjh@lut.cn),主要从事流体机械内部流动机理及设计研究.   
作者简介: 李海龙(1987—),男,山东菏泽人,硕士研究生(lhlemo@163.com),主要从事流体机械设计研究.
引用本文:   
杨军虎,李海龙,龚朝晖等. 离心泵反转作液力透平的力学特性[J]. 排灌机械工程学报, 2014, 32(1): 12-16.
YANG Jun-Hu,LI Hai-Long,GONG Chao-Hui et al. Radial thrust behavior in centrifugal pump as hydro-turbine[J]. Journal of Drainage and Irrigation Machinery Engin, 2014, 32(1): 12-16.
 
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