| 深海采矿细颗粒羽状流数值模拟研究 |
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| 引用本文： | 刘港慧,刘 磊.深海采矿细颗粒羽状流数值模拟研究[J].海洋工程,2023,41(5):150-160. |
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| 作者姓名： | 刘港慧 刘 磊 |
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| 作者单位： | 1. 上海交通大学 三亚崖州湾深海科技研究院，海南 三亚 572024；2. 上海交通大学 海洋工程国家重点实验室，上海 200240 |
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| 基金项目： | 海南省科技计划三亚崖州湾科技城联合资助项目（520LH052）；国家自然科学基金资助项目（51909164） |
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| 摘 要： | 深海采矿尾矿排放产生的细颗粒羽状流会对海底生态环境造成影响，预测尾矿排放羽状流行为及其对环境影响具有工程意义。基于欧拉多相流方法，采用欧拉双流体模型对深海采矿细颗粒羽状流开展数值模拟研究，分析近海底排放的羽状流演化和发展过程，探究羽状流初始排放质量浓度、排放速度对羽状流扩散过程的影响。结果表明：初始排放条件对羽状流演化性质有重要影响。主射流区被稀释的程度随着初始入射速度的增大而减小，随着入射质量浓度的增大而增大；初始羽状流入射速度和质量浓度越大，撞击海底后的水平方向流动速度越快，影响区域越广；水平速度的峰值随着初始入射速度的增大呈对数增长；当初始质量浓度和速度高于50 g/L和 0.5 m/s 时可能会导致颗粒在海底撞击点附近堆积成坡状，影响底流的后续发展。研究结果可以为深海采矿尾矿排放参数选择提供参考。
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| 关 键 词： | 深海采矿 细颗粒羽状流 数值模拟 多相流 |
| 收稿时间： | 2022/10/27 0:00:00 |
| 修稿时间： | 2023/1/6 0:00:00 |
Numerical simulation of fine particle plume flow in deep-sea mining |
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| LIU Ganghui,LIU Lei.Numerical simulation of fine particle plume flow in deep-sea mining[J].Ocean Engineering,2023,41(5):150-160. |
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| Authors: | LIU Ganghui LIU Lei |
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| Abstract: | Fine particle plumes produced by the tailings discharge of deep-sea mining systems have a certain impact on the seabed ecological environment. The prediction of the epidemic pattern of tailings discharge plumes and the environmental impacts are of considerable engineering significance. In the present study, based on the Euler multiphase flow method, numerical simulations of the deep-sea mining fine particle plume were conducted by Euler two-fluid model. The evolution and development of plume released close to the seabed were analyzed, and the influences of the initial mass concentration and velocity on the plume diffusion process were investigated. It is revealed that the initial discharge conditions have an important influence on the evolution properties of the plume. The dilution degree of the main jet zone decreases with the increase of the initial incident velocity, but increases with the increase of the incident mass concentration. With the increase of initial mass concentration and velocity, the plume diffuses faster, which leads to the wider affected area near the seabed. The peak value of the horizontal velocity increases logarithmically with the increase of the initial incident velocity. When the initial mass concentration and velocity are higher than 50 g/L and 0. 5 m/s, the particles may accumulate in a slope shape near the impact point of the seabed and affect the subsequent development of underflows. The results provide a reference for the selection of discharge parameters of deep-sea mining tailings. |
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