排灌机械工程学报
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排灌机械工程学报  2017, Vol. 35 Issue (4): 296-302    DOI: 10.3969/j.issn.1674-8530.15.0280
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口环间隙对高速泵泵腔内流动特征的影响
杨从新, 强盼
兰州理工大学能源与动力工程学院, 甘肃 兰州 730050
Effects of wear-rings clearance on flow characteristic in impeller side chamber of high-speed centrifugal pump
YANG Congxin, QIANG Pan
College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China
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摘要 为分析泵腔内流场结构及口环间隙变化对高速泵在设计工况下性能的影响,基于雷诺时均N-S方程及RNG k-ε湍流模型的理论基础,以转速n=38 500 r/min的离心泵为研究对象,对其进行全流场数值模拟.结果表明,前后泵腔内ut/u均随着半径的增加而减小;沿着叶轮旋转方向ut/u也不断减小,α=0°即蜗壳隔舌附近时ut/u值最小.在前后泵腔内,靠近盖板的区域ur/u>0;靠近壳体的区域ur/u<0.后口环间隙分别对前后腔流场结构的影响基本一致:在同一轴向位置处,随着口环间隙的增大,流动核心区的ut/u增大,靠近壳体一侧的ur/u减小;在同一半径位置,口环间隙越大,静压越小.
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杨从新
强盼
关键词离心泵   泵腔   口环间隙   高转速   流动特征     
Abstract: In order to analyze the flow characteristic in the impeller side chamber and the effect of wear-rings clearance modifications on it, the RNG k-ε turbulence model is employed in the Reynolds averaged Navier-Stokes equations in this study. A high-speed centrifugal pump with a speed of 38 500 r/min in a design condition was studied using CFD method. Results show that ut/u decreases with the increase of the radius in the front and back impeller side chamber; ut/u also constantly decreases in the impeller rotation direction and reaches the minimal value at α=0°(near the volute tongue).Near the should side of front as well as back impeller side chamber,there exists ur/u>0;while near the stator side of front as well as back impeller side chamber,there exists ur/u<0.The effects of the front wear-rings clearance and rear wear-rings which are separately imposed on the flow field structure of field structure of the front and back impeller side chamber are mainly coincident: at the same axial location,with the increase of the wear-rings clearance,ut/u of the core flow region increases; ur/u close to the stator side decreases; at the same radius, the larger the wear-rings clearance, the lower the static pressure.
Key wordscentrifugal pump   impeller side chamber   wear-rings clearance   high-speed   flow characteristic   
收稿日期: 2015-12-17;
通讯作者: 强盼(1990—),女,甘肃会宁人,硕士研究生(通信作者,qiangpan_fluidfly@163.com),主要从事流体机械内部流动研究.   
作者简介: 杨从新(1964—),男,陕西兴平人,教授,博士生导师(ycxwind@163.com),主要从事流体机械的设计与研究.
引用本文:   
杨从新,强盼. 口环间隙对高速泵泵腔内流动特征的影响[J]. 排灌机械工程学报, 2017, 35(4): 296-302.
YANG Cong-Xin,QIANG Pan. Effects of wear-rings clearance on flow characteristic in impeller side chamber of high-speed centrifugal pump[J]. Journal of Drainage and Irrigation Machinery Engin, 2017, 35(4): 296-302.
 
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