排灌机械工程学报
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排灌机械工程学报  2017, Vol. 35 Issue (12): 1018-1023    DOI: 10.3969/j.issn.1674-8530.16.0197
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颗粒粒径对导叶式离心泵动静叶栅内流动的影响
李仁年1,2, 陈昊1, 韩伟1,2, 李雪峰1, 刘慧娟1
1.兰州理工大学能源与动力工程学院, 甘肃 兰州 730050; 2.甘肃省流体机械及系统重点实验室, 甘肃 兰州 730050
Effect of particle size on flow in stator and rotor cascades of guide vane type centrifugal pump
LI Rennian1,2, CHEN Hao1, HAN Wei1,2, LI Xuefeng1, LIU Huijuan1
1.School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2.Gansu Key Laboratory of Fluid Machinery and System, Lanzhou, Gansu 730050, China
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摘要 为了研究不同粒径的颗粒对动静叶栅内固液两相涡流结构演化过程的影响,以导叶式离心泵作为研究对象,采用ICEM软件对研究对象进行六面体网格划分,选用Mixture混合模型和LES大涡模拟对导叶式离心泵进行全流场三维模拟计算.对比分析0.1,0.2和0.3 mm这3种粒径下的颗粒对动静叶栅内涡量演化和叶轮-导叶内压力脉动,结果表明:随着颗粒粒径不断增大,叶轮区域颗粒体积分数总体不断减小,而且颗粒分布更加不均匀,在导叶区域,随着颗粒粒径增大,导叶背面出现明显的颗粒聚积区.由于颗粒在叶轮、导叶内的受力不同,导致随着颗粒粒径的增大,导叶部分的压力不断减小,但叶轮区域压力变化并不明显.受到叶轮与导叶动静干涉的作用,颗粒在叶轮、导叶内受到的作用也不相同,尤其在叶轮与导叶交接处,脉动十分不稳定.
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李仁年
陈昊
韩伟
李雪峰
刘慧娟
关键词导叶式离心泵   动静叶栅   固液两相流   涡量   压力脉动     
Abstract: In order to study the effect of particle size on the evolution of solid-liquid two-phase vortex structure, the vane type centrifugal pump is taken as the research object. Using the ICEM software on the research object of hexahedral mesh generation, the Mixture model and the large eddy simulation(LES)is used to simulate the whole flow field of the vane type centrifugal pump. The effects of particle size on the evolution of vorticity and the pressure pulsation in the impeller-guide vanes were analyzed and compared with those of 0.1, 0.2 and 0.3 mm. The results show that with the particle size increasing, the overall particle volume fraction in the impeller region decreases, and particle size distribution is more nonuniform. In the guide vane region, with the increase of the particle size, in back of the guide vane appeared an obvious particle aggregation area. Owing to the different force on the particles in impeller and guide vane, with the increase of the particle size, the pressure of the guide vane decreases, but the pressure in the impeller region is not obvious. Because of the rotor-stator interaction between the impeller and the guide blade, the action on the particles in the impeller and guide blade is not the same, especially at the joint of the impeller and guide vane, pressure fluctuation is very unstable.
Key wordsvane type centrifugal pump   static and dynamic cascade   solid-liquid two-phase flow   vorticity   pressure fluctuation   
收稿日期: 2016-08-25;
基金资助:国家自然科学基金资助项目(51579125)
通讯作者: 陈昊(1992—),男,甘肃嘉峪关人,硕士研究生(通信作者,k491969538@163.com),主要从事水力机械内部固液两相流动研究.   
作者简介: 李仁年(1963—),男,甘肃民勤人,教授,博士生导师(lirn@lut.cn),主要从事流体机械理论与设计研究.
引用本文:   
李仁年,,陈昊等. 颗粒粒径对导叶式离心泵动静叶栅内流动的影响[J]. 排灌机械工程学报, 2017, 35(12): 1018-1023.
LI Ren-Nian-,,CHEN Hao- et al. Effect of particle size on flow in stator and rotor cascades of guide vane type centrifugal pump[J]. Journal of Drainage and Irrigation Machinery Engin, 2017, 35(12): 1018-1023.
 
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