摘要
由于深海采矿作业深度逐渐增加,矿石颗粒在长距离水力输送过程中相互作用增强,增加了管道拥堵的概率,严重影响深海采矿效率的提升。现有研究主要关注2个球形颗粒之间的相互作用,然而实际情况涉及更为复杂的多颗粒排列方式,因此需要开展针对性研究。该文针对三角排列球形颗粒的绕流问题,运用浸没边界法进行了直接数值模拟,开展不同间距比(L/D=1.50、1.75和2.00)以及多组雷诺数(Re=300、600)的三维绕流分析,旨在揭示速度场、压力场、尾迹结构和阻力系数之间的相互作用规律。结果表明:球体颗粒尾迹涡脱落稳定程度与间距比之间呈正相关,球体间的射流状流动强度与间距比之间存在强负相关性;存在临界间距比L/D=2.00,使得上游先导球体能够为下游球体形成减阻。该研究结果揭示了优化颗粒排列方式和颗粒尾迹区不稳定性之间的关系,可为深海采矿水力输送减阻力输送的设计和操作提供重要参考。
With the increasing depths of deep-sea mining operations,the interaction between ore particles during long-distance hydraulic transport intensifies,leading to a higher probability of pipeline blockages,which severely affects the efficiency of deep-sea mining lifts.Existing studies primarily focus on the interaction between two spherical particles.However,the actual scenario involves more complex multi-particle arrangements,necessitating targeted research.This paper conducts direct numerical simulations using the immersed boundary method to investigate the flow around triangular arrangements of spherical particles.The study examines different spacing ratios(L/D=1.50,1.75,and 2.00)and multiple Reynolds numbers(Re=300,600)in a three-dimensional flow analysis to reveal the interaction patterns between the velocity field,pressure field,wake structure,and drag coefficient.The results indicate a positive correlation between the stability of vortex shedding in the particle wake and the spacing ratio.Moreover,there is a strong negative correlation between the intensity of jet-like flow between particles and the spacing ratio.Additionally,an acritical spacing ratio of L/D=2.00 is identified,where the upstream leading sphere can reduce the drag on the downstream sphere.The findings of this study reveal the relationship between optimizing particle arrangements and the instability in the particle wake region,providing essential insights for designing and operating drag-reducing hydraulic transport systems in deep-sea mining.
作者
程卓
银波
王莹莹
王科
Cheng Zhuo;Yin Bo;Wang Yingying;Wang Ke(College of Mechanical and Transportation Engineering,China University of Petroleum-Beijing,Beijing 102249,China;LMFS,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China;College of Safety and Ocean Engineering,China University of Petroleum-Beijing,Beijing 102249,China)
出处
《水动力学研究与进展(A辑)》
北大核心
2025年第2期193-201,共9页
Chinese Journal of Hydrodynamics
基金
国家重点研发项目(2022YFC2803701)
国家自然科学基金项目(52376157)。
关键词
深海采矿
直接数值模拟
浸没边界法
尾迹不稳定性
Deep-sea mining
Direct Numerical Simulation(DNS)
Immersed Boundary Method(IBM)
Wake instability
