ALIP电磁泵三维瞬态特性与不稳定流动机理  

Three-dimensional transient characteristics and unstable flow of annular linear induction pump

作　　者：赵睿杰[1] 苗衡 张德胜[1] 黄俊[1] 高雄发[1] ZHAO Ruijie;MIAO Heng;ZHANG Desheng;HUANG Jun;GAO Xiongfa(National Research Center of Pumps,Jiangsu University,Zhenjiang,Jiangsu 212013,China)

机构地区：[1]江苏大学国家水泵及系统工程技术研究中心

出　　处：《排灌机械工程学报》2019年第10期841-847,共7页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家重点研发计划项目子课题(2017YFC0404203);国家自然科学基金资助项目(51509110);中国博士后基金资助项目(2015M581736);天津市自然科学基金资助项目(16JCYBJC19200);江苏大学高级人才科研启动基金资助项目(5501440001)

摘　　要：采用基于有限元法的COMSOL软件,建立ALIP电磁泵三维瞬态磁流耦合模型.通过整体式外定子ALIP电磁泵模型的模拟结果与前人试验数据的对比,验证模型的正确性.在此基础上,建立分离式外定子ALIP电磁泵模型,观察到类开尔文-亥姆霍兹不稳定性现象的演化过程.周向面(φ-z)上逆向流和涡总是出现在2个定子间空气对应的流道区域,后期在空气对应的涡流区域后方出现类似波浪的流体摆动;子午面(r-z)上不稳定流动最先在外管壁处出现.最后,从力平衡角度分析类开尔文-亥姆霍兹不稳定性现象的形成机理.研究表明,分离式定子结构使磁场和洛伦兹力在周向和径向上分布不均,进而影响流场分布,最终导致不稳定流动.A three-dimensional transient magnetic-fluid coupling model of ALIP was established by using COMSOL software based on finite element method.The model was verified by comparing the si-mulation results of integral external stator ALIP model with the previous experimental data.On this basis,the ALIP model of the separated external stator was established,and the evolution process of Kelvin-Helmholtz-like instability was observed.The reverse flow and vortices on the circumferential plane(φ-z)always appear in the channel region corresponding to the air between the two stators,and a wave-like swing of the flow is presented at the rear of the unstable flow region.The unsteady flow on the meridional plane(r-z)firstly appears near the outer duct wall.Finally,the formation mechanism of Kelvin-Helmholtz-like instability was analyzed from the perspective of force balance.The results show that the separated stator structure makes the magnetic field and Lorentz force non-uniformly distributed in the azimuthal and radial directions,and then affects the distribution of flow field,which eventually leads to unstable flow.

关 键 词：ALIP 磁流体动力学 不稳定流动 CFD 

分 类 号：TH35[机械工程—机械制造及自动化] S277.9[农业科学—农业水土工程]