排灌机械工程学报
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排灌机械工程学报  2011, Vol. 29 Issue (2): 99-103    DOI: 10.3969/j.issn.1674—8530.2011.02.002
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离心泵内部空化特性的CFD模拟
王 勇, 刘厚林, 袁寿其, 谈明高, 王 凯
(江苏大学流体机械工程技术研究中心, 江苏 镇江 212013)
CFD simulation on cavitation characteristics in centrifugal pump
Wang Yong, Liu Houlin, Yuan Shouqi, Tan Minggao, Wang Kai
(Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, Jiangsu 212013, China)
 全文: PDF (508 KB)   HTML (1 KB)   输出: BibTeX | EndNote (RIS)      背景资料
摘要 基于ANSYS CFX软件应用标准 k-ε 湍流模型、均质多相模型和Rayleigh-Plesset方程,对一比转数为94的离心泵在不同工况下其内部的空化特性进行数值模拟.根据模拟结果预测了模型泵无空化时的能量特性和发生空化时的空化性能,分析了不同空化状态下叶轮中间流面内的空泡分布和叶片中间流线上的载荷特性,并与试验结果进行对比.结果表明:预测结果具有一定的精度,模型泵在3个工况下空化余量的绝对误差分别为0.25,0.29和0.06 m.流场分析表明:随着进口总压的降低,空泡首先在叶片背面进口边附近产生,然后沿流线向叶轮出口扩散,并随着流道过流面积的增加向叶片工作面扩展;与其他叶片相比,正对蜗壳隔舌叶片中间流线上的载荷最小.随着泵空化程度的加剧,除正对蜗壳隔舌的叶片外,其余叶片上相对位置为0.35~0.80处的载荷明显增加,说明空化对叶片载荷有较大的影响.
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王 勇
刘厚林
袁寿其
谈明高
王 凯
关键词离心泵   空化特性   叶片载荷   计算流体动力学   流场     
Abstract: The standard k-ε turbulence model, homogeneous multiphase model and Rayleigh-Plesset equation were applied to simulate cavitation characteristics in a centrifugal pump with specific speed of 94 under different conditions based on ANSYS CFX software. According to the simulation results, the energy characteristics under the no-cavitation conditions and cavitation characteristics of the model pump were predicted, and the vapor volume distribution on the middle stream surface of impellerand the blade loading characteristics on the middle stream line under different cavitation conditionswere analyzed. The comparison between prediction values and experimental values indicates that the prediction results are accurate to some extent, and the absolute errors of net positive suction head under different conditions are 0.25, 0.29 and 0.06 m, respectively. The flow field analysis indicates that the vapors generated at suction side of blade near the leading edge at firstand then extended to the outlet of impeller with the reduction of inlet total pressure. Compared with other blades, the loading on the blade that against the volutetongue is the least and the loading on the other blades at the relative position of 0.35-0.80increased obviously with the deterioration of cavitation condition,which shows that the blade loading is significantly affected by cavitation.
Key wordscentrifugal pump   cavitation characteristics   blade loading   computational fluid dynamics   flow field   
收稿日期: 2010-11-05; 出版日期: 2011-03-30
基金资助:

国家863计划项目(2007AAOSZff7):江苏高等学校优秀科技创新团队项目(苏教科(2009)10号)

通讯作者: 施卫东(1964-.男.江苏南通人.研究员,博士生导师(wdshi@uis.edu.cn).主要从事流体机饿及工程的研究.   
作者简介: 孙新庆(1982-),男,河南商丘人,硕士(sunxql68@163.com),主要从事流体机械及工程的研究.
引用本文:   
王 勇,刘厚林,袁寿其等. 离心泵内部空化特性的CFD模拟[J]. 排灌机械工程学报, 2011, 29(2): 99-103.
WANG Yong,LIU Hou-Lin,YUAN Shou-Qi et al. CFD simulation on cavitation characteristics in centrifugal pump[J]. Journal of Drainage and Irrigation Machinery Engin, 2011, 29(2): 99-103.
 
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