本项目围绕国家深海矿产资源开发的重大战略需求，聚焦深海矿石长距离垂直管道水力输送问题，基于申请人在博士阶段对固液两相流管道输送的研究基础，研究大颗粒固液两相流垂直管道输送的流态演化机理和流动保障特性。本项目从垂直管道湍流中颗粒-流体-壁面的相互作用机理出发，分析颗粒-流体的流固耦合作用，建立颗粒-颗粒、颗粒-壁面的碰撞模型；发展大颗粒固液两相流计算流体动力学-离散元耦合数值模拟方法；建立固液两相流长距离、长时间持续输送特性的数学物理模型。综合采用理论、数值、试验方法，分析管道内固液两相流的流态及演化规律；揭示管道内稳定流动-段塞流-堵塞的形成和相互转化机理；预报段塞流、堵塞的产生时刻和位置，分析段塞流、堵塞发生时壁面切应力和流体经过孔隙结构的冲击作用，探究段塞流、堵塞的解除方案，为深海长距离水力输送系统的设计和应用提供理论基础和科学依据。

According to the major strategy on the development of deepsea mineral resources, this project focuses on the long-distance vertical hydraulic transport of deepsea ores. Based on the previous study of the solid-liquid two-phase flow transport, the flow pattern evolution and flow assurance of large particle solid-liquid two-phase flow during vertical hydraulic transport are investigated. On the basis of the mechanism of particle-fluid-wall interaction in the turbulent flow inside the vertical pipe, the particle-fluid interaction is analyzed; the models of particle-particle collision and particle-wall collision are established; the coupling simulation method of Computational Fluid Dynamics-Discrete Element Method is developed; the mathematical physics equations of the flow characteristics during long-distance and long-time transport are established. By employing analytical method, numerical simulation and experiment, the flow pattern and the evolution of solid-liquid two-phase flow in the pipeline are analyzed; the formation and evolution mechanism between the stable flow, the slug flow and the blockage are revealed; the time and position of the solid plug and the blockage are predicted; the wall shear stress of the slug flow and the blockage is analyzed; the impact of the flow on the solid plug is studied. Finally, the solutions to the slug flow and blockage are provided. The research provides the theoretical foundation and scientific basis for the design of long-distance vertical hydraulic transport in deepsea mining.