摘要
近年来,深海采矿技术及装备的研发引起了众多学者的重视。因对水力采集方式中矿石颗粒附近旋涡流场的认识不够,导致颗粒采集效率低。本文采用欧拉-拉格朗日固液两相计算方法,结合重叠网格方法,对球形矿石颗粒在垂直管道抽吸作用下的启动特性开展数值模拟研究,分析了尾流和涡结构随颗粒运动的变化规律,得出颗粒直径为40 mm,集矿高度为0.07 m的典型集矿工况下颗粒启动的临界速度和临界提升力。本文发现颗粒进入采集口后,颗粒的阻力系数C_(d)和颗粒雷诺数Re_(p)达到峰值,随后趋于平稳。颗粒尾流和旋涡随采集逐渐演化发展,且颗粒所受垂直力在平均值附近呈现出振荡特性是由颗粒尾涡的分离点靠近圆球顶部导致。研究结果可为水力集矿系统的设计提供参考。
In recent years,the research and development of deep-sea mining technology and equipment has attracted the attention of many scholars.The low harvest rate of particle collection has caused by the insufficient recognition of the vortex flow field near the ore particles in the hydrodynamic collection method.In this paper,the Eulerian-Lagrangian solid-liquid two-phase calculation method,combined with the overlapping grid method,is used to carry out numerical simulations of the initiation characteristics of spherical ore particles under the action of vertical pipe suction.The variation law of wake and vortex structure with particle motion is analyzed,and the critical velocity and critical lifting force of particle start-up under the condition that the diameter of particle is 40 mm and the height of ore collection is 0.07 m are derived.It is found that the particle drag coefficient C_(d) and particle Reynolds number Re_(p) reach the peak after the particle enters the collection port and then level off.The wake and vortex of the particle gradually evolved along with the acquisition,and the vertical force on the particle showed oscillation characteristic near the average value,which was caused by the separation point of the particle tail vortex close to the top of the sphere.
作者
夏秋
贾浩
宿向辉
杨荐
XIA Qiu;JIA Hao;SU Xianghui;YANG Jian(Zhejiang Key Laboratory of Fluid Transfer Technology,Zhejiang Sci-Tech University,Hangzhou 310018,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2023年第3期660-667,共8页
Journal of Engineering Thermophysics
基金
浙江省自然科学基金(No.LQ20E060009)
浙江理工大学科研启动基金(No.19022101-Y)。
关键词
深海采矿
颗粒水力采集
垂直力
固液两相流
deep-sea mining
particle hydrodynamic harvesting
vertical forces
solid-liquid twophase flow
