背叶片对固液两相螺旋离心泵轴向力与流场的影响  

Influence of screw centrifugal pump for back-blade on axial force and flow-field based on the solid-liquid two-phase medium

作　　者：程效锐[1] 李仁年[1] 郭伟丽 韩伟[1] 高杨[1] 申立新[1] 

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

出　　处：《兰州理工大学学报》2013年第2期29-34,共6页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(5107906);甘肃省自然科学基金(0916RJZA022);甘肃省财政厅基金(1201ZTC003)

摘　　要：基于相对坐标系下的雷诺时均N-S方程和RNG湍流模型,采用非结构化混合网格技术和SIMPLEC算法,对带有叶轮背叶片的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5种不同螺旋离心泵叶轮方案,并分别以清水和固液为介质,对各种方案下泵内流动进行全三维数值模拟,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流场及轴向力变化趋势和规律.结果表明:清水介质以及不同固相颗粒体积分数下轴向力具有几乎一致的变化规律,且轴向力大小随固相颗粒体积分数的增大而增大.背叶片对叶轮轴向力大小和方向均有影响,背叶片数目、宽度对于平衡轴向力均存在最优值且对后腔及蜗壳内部流动有较大影响.背叶片对后腔间隙及蜗壳内固相颗粒体积分数分布及压力分布影响较大.背叶片消耗一定的轴功率,其宽度变化对轴功率影响较大,数目对轴功率的影响有最优值.Full three-dimensional numerical simulation was carried out for a screw centrifugal pump with back blades on the basis of Reynolds time-averaged Navier-Stokes equation in relative reference frame and RNG k-ε turbulence mode and by using the nonconstructive mixed meshing technique and SIMPLEC algo- rithm. By changing the number of impeller back-blade and its width, five different options of screw cen- trifugal pump were designed and their full three-dimensional numerical simulation of the flow in the pump were carried out respectively with fresh water and solid-liquid two-phase medium, so that the variation pattern and trend of axial force and flow-field were obtained for the pumps without back-blade and with back-blade with different number and width. The result showed that the axial force would exhibit almost i- dentical variation pattern for both the fresh water and solid-phase medium with different volume fraction and it would increase with the volume fraction. The back blades would have a noticeable effection on bal- ancing the axial force and would have influence on its magnitude and direction. The number and width of the back blade would have their optimum for balancing the impeller axial force, meanwhile they would af- fect the inner flow-field in pump back chamber and casing. The back blades would affect solid particles concentration and pressure distribution in pump casing and back chamber gap. The back blades would con- sume a certain amount of shaft power and its width variation would have a greater influence on the shaft power. The influence of number of back-blades on shaft power would have an optimum.

关 键 词：螺旋离心泵 背叶片 固液两相流 轴向力 流场 

分 类 号：TH311[机械工程—机械制造及自动化]