摘要
深海矿产资源开发一般采用水力提升方式将海底矿石输送到水面.单个矿石颗粒在水中的运动特性及尾流特征是水力提升动力学特性研究的基础.文中采用计算流体力学方法,对不同直径、密度的球形矿石颗粒在水中自由下落的过程进行了数值模拟.采用基于剪切应力运输的分离涡方法模拟颗粒周围流场,研究了单颗粒在雷诺数Re=184,228,285和6 400时的六自由度运动及尾流结构.研究发现,随着Re增大,颗粒分别呈现垂直下落、倾斜直线下落、倾斜振荡下落、随机下落4种不同路径,通过分析其尾流结构及受力特征,讨论了不同下落路径的产生机理,所得结果可为深海矿产资源水力提升管道的设计和机理研究提供参考与支撑.
Hydraulic lifting is a typical way to transport the ores in deep ocean mining systems. Investigation on the characteristics of motion and wake of a single free falling ore particle is the basis of the research on the dynamic performances of a hydraulic lifting system. Numerical simulations of free falling sphere particles with various diameters and densities in still water have been carried out with computational fluid dynamic（ CFD） method.The flow field around the sphere has been simulated with detached-eddy simulation（ DES） method based on shear stress transport（ SST） model,and the six-degree-of-freedom motions as well as the wake structures behind the spheres have been investigated with Reynolds number（ Re） of 184,228,285 and 6 400. Four different path regimes： vertical,steady oblique,oscillating oblique and chaotic,have been observed as the Reynolds number increases. An insight into understanding the different path regimes is provided by the analysis on the wake structures and the forces and torques acting on the spheres. The results of this article can provide reference and support for mechanism study and design of the hydraulic lifting pipes in deep ocean mining systems.
出处
《江苏科技大学学报（自然科学版）》
CAS
北大核心
2017年第5期620-628,共9页
Journal of Jiangsu University of Science and Technology:Natural Science Edition
基金
国家重点研发计划支持资助项目(2016YFC0304103)
关键词
自由下落
流场特性
尾涡结构
雷诺数
free falling,flowfield characteristics,wake structure,Reynolds number
