垂直管道内粗颗粒运动特性数值模拟
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摘要
为研究深海采矿管道提升系统中颗粒的运动规律,采用数值模拟的方法对不同粒径、不同入射位置的单个颗粒及单一粒径和混合粒径颗粒群的运动规律进行了研究。结果表明,颗粒输送速度随着颗粒粒径增大而减小;从管道中心到壁面,颗粒速度逐渐减小;颗粒群输送颗粒存在一定程度的碰撞,输送的能量损失更大。得到了垂直管道内颗粒的运动规律,对颗粒输送速度、碰撞、能量损失等进行了量化分析。对未来深海采矿水下输送系统设计有一定参考意义。
For obtaining the law of motion of coarse particles in the pipeline lifting system for deep sea mining, the motion trajectory of individual particle with different grain sizes and different entering positions, as well as of particle group composed of particles with single grain size and mixed grain sizes were studied by using numerical simulation method. The results showed that the conveying velocity for particles decreased with the increasing of grain size, and gradually decreased from the center of the pipe toward the wall. Collision among particles could be occurred during the transport of particle group, resulting in greater energy losses for transport. The law of particle motion in the vertical pipeline was finally obtained, and then particle transport velocity, particle collision as well as energy loss were analyzed quantitatively. The study result is of certain reference significance for the design of underwater transportation system for the future deep-sea mining.
For obtaining the law of motion of coarse particles in the pipeline lifting system for deep sea mining, the motion trajectory of individual particle with different grain sizes and different entering positions, as well as of particle group composed of particles with single grain size and mixed grain sizes were studied by using numerical simulation method. The results showed that the conveying velocity for particles decreased with the increasing of grain size, and gradually decreased from the center of the pipe toward the wall. Collision among particles could be occurred during the transport of particle group, resulting in greater energy losses for transport. The law of particle motion in the vertical pipeline was finally obtained, and then particle transport velocity, particle collision as well as energy loss were analyzed quantitatively. The study result is of certain reference significance for the design of underwater transportation system for the future deep-sea mining.
引文
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[2] 陈光国,阳宁,唐达生,等.垂直管道颗粒及颗粒群沉降运动规律研究[J].泥沙研究,2010(4):16-21.
[3] 肖红,唐达生.砂矿颗粒沉降运动规律试验研究[J].矿冶工程,2015,35(3):1-3.
[4] 唐达生,肖红,宋跃文,等.深海粗颗粒矿石浮游速度的试验研究[J].矿冶工程,2016,36(3):1-5.
[5] 陈光国,阳宁,唐达生,等.水力提升颗粒及颗粒群浮游运动规律研究[J].矿冶工程,2010,30(4):9-13.
[6] 宋跃文,朱小军,唐达生.垂直提升管道中粗颗粒滑移速度试验研究[J].矿冶工程,2016,36(4):5-7.
[7] 姚妮均,曹斌,夏建新.深海采矿系统软管段输送阻力损失研究[J].矿冶工程,2018,38(2):10-14.
[8] 周知进,刘爱军,夏毅敏,等.颗粒组分特性对扬矿硬管输送速度的影响[J].中南大学学报(自然科学版),2011,42(9):2692-2697.
[9] 王英杰,阳宁,金星.水力提升管道大颗粒运动特性的高速摄影分析[J].泥沙研究,2012(3):64-69.
[10] 唐达生,宋跃文,朱小军,等.粗颗粒矿石在提升管道内的旋转特性[J].中南大学学报(自然科学版),2017(7):1831-1838.
[11] Song Y,Zhu X,Sun Z,et al.Experimental investigation of particle-induced pressure loss in solid-liquid lifting pipe[J].Journal of Central South University,2017,24(9):2114-2120.
[12] 刘磊,杨建民,吕海宁,等.球形颗粒自由下落过程运动和流场数值分析[J].江苏科技大学学报(自然科学版),2017,31(5):620-628.