飞逸工况下扬矿泵内颗粒运动特性研究  

Study on particle motion characteristics in mining lifting pump under runaway condition

作　　者：谈明高[1] 张志华 刘厚林[1] 屈兵 TAN Minggao;Zhang Zhihua;LIU Houlin;QU Bing(National Research Center of Pumps and System Engineering Technology,Jiangsu University,Zhenjiang 212013,Jiangsu China;Shandong Xinchuan Mining Electromechanical Equipment Co.Ltd.,Jining 272300,Shandong 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,江苏镇江212013 [2]山东心传矿山机电设备有限公司,山东济宁272300

出　　处：《华中科技大学学报（自然科学版）》2023年第10期100-106,共7页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51979124);国家重点研发计划资助项目(2019YFC03101)。

摘　　要：采用CFD-DEM耦合数值模拟和可视化试验相结合的方法探究了扬矿泵在飞逸工况下的内部颗粒运动特性.试验结果表明:在水泵工况或飞逸工况下,扬矿泵首级导叶和次级导叶内的颗粒运动状态基本相似;水泵工况下导叶内有52.5%的颗粒均靠近叶片工作面流动,颗粒整个运动过程流动顺畅且稳定;颗粒在液相漩涡中的涡动及随叶轮反转的回流运动使飞逸工况下颗粒运动状态更多,其中40.5%的颗粒从导叶出口中部进入,跟随液相沿叶片背面平行方向从导叶流出,且发生涡动和碰撞的颗粒总占比高达59.5%.数值模拟结果表明:在飞逸工况下,颗粒进入次级导叶之前速度增加,并在导叶出口轴向转弯处出现堵塞;叶轮内颗粒速度梯度较小,且速度分布较为混乱;在飞逸工况下,叶轮内颗粒绝对运动轨迹包角较小,偏转不明显,首级导叶和次级导叶内颗粒绝对运动轨迹基本呈中心对称分布.The internal particle motion characteristics of the lifting pump under runaway condition were investigated by combining computational fluid dynamics-distinct element method(CFD-DEM)coupled numerical simulation with visualization experiment.Experimental results show that under pump condition or runaway condition,the particle movement state in the first guide vane and second guide vane is similar.Under the pump condition,52.5%of the particles in the guide vane flow forward near the pressure side of the guide vane and particles flow smoothly and stably in the whole journey.The swirling motion of particles in the liquid vortex and the backflow motion resulting from the impeller reversal contribute to a more complex particle motion state under the runaway condition,where 40.5%of the particles flow out guide vane along the suction side,and 59.5%of the particles undergo whirling motion and collision.Numerical simulation results show that under runaway conditions the particle velocity increases before it flows into guide vane,and particles are easy to accumulate at the axial turning of the guide vane.Particle velocity gradient in the impeller is not significant,and the velocity distribution is chaotic.Under runaway conditions,the absolute motion trajectories of particles within the impeller show a smaller wrap angle,and the particle deflection is not evident,and the absolute trajectory of the particle in the first-stage guide vanes and second-stage guide vanes is centrosymmetric.

关 键 词：固液两相流 扬矿泵 飞逸工况 颗粒运动特性 试验测试 计算流体力学-离散单元法 

分 类 号：TH311[机械工程—机械制造及自动化]