螺旋离心泵叶轮背叶片对轴向力影响的数值分析  

Numerical Calculation for Effects of Impeller Back Pump-out Vanes on Axial Thrust in Screw Centrifugal Pump

作　　者：李仁年[1] 高杨[1] 程效锐[1] 韩伟[1] 郭伟丽 

机构地区：[1]兰州理工大学能源与动力工程学院,兰州730050 [2]中国重汽集团济南动力部,济南250200

出　　处：《机械工程学报》2012年第12期156-161,共6页Journal of Mechanical Engineering

基　　金：国家自然科学基金(51079066);甘肃省自然科学基金(0906ZTB093);甘肃省财政厅专项基金(1201ZTC003)资助项目

摘　　要：基于相对坐标系下的雷诺时均N-S方程和RNG k-湍流模型,采用非结构化混合网格技术和SIMPLEC算法,以清水为介质,对带有叶轮背叶片的80LN-6型螺旋离心泵进行全三维数值模拟。通过改变叶轮背叶片数目和宽度设计出6种不同螺旋离心泵叶轮方案,对各种方案下泵内流动进行数值模拟,获得螺旋离心泵叶轮无背叶片和不同背叶片数目及宽度下轴向力的变化趋势和规律。通过对外特性试验数据和CFD数值模拟数据对比,间接地验证了数值模拟方法的可靠性。并对6种不同螺旋离心泵叶轮方案模拟数据进行分析,结果表明,螺旋离心泵添加叶轮背叶片之后,轴向力大小发生变化,同时在不同方案中不同工况下轴向力方向也发生改变;背叶片数目、背叶片宽度对于平衡轴向力均存在最优值且对后腔及蜗壳内的压力分布有较大影响。Using unstructured hybrid grid technique and SIMPLEC algorithm, selecting clear water as the medium, a general three-dimensional simulation based on Reynolds Navier-Stokes in multiple reference frames and the RNG k-8 turbulence model, is presented for the 80LN-6 screw centrifugal pump with impeller back pump-out vanes. Six different schemes are designed by a change of the number and width of impeller back pump-out vanes of the screw centrifugal pump, the inner flow field in every scheme is simulated, accordingly, the variation of axial thrust in the screw centrifugal pump is obtained. The reliability of the numerical simulation method is indirectly validated by the comparison between global performance characteristics of experimental data and test data. And the simulated data of the six different schemes are analyzed, the results obtained show that after adding the impeller back pump-out vanes, the magnitude of the axial thrust in the screw centrifugal pump changed, and the direction of the axial thrust also changed at different conditions in different schemes. For balancing the axial thrust, there exist optimum values for the width and the number of impeller back pump-out vanes, which have great influence on the distribution of the pressure in seal chamber and volute casing.

关 键 词：螺旋离心泵 背叶片 轴向力 外特性 数值模拟 

分 类 号：TK7[动力工程及工程热物理—流体机械及工程]