考虑流固耦合的深海采矿长输流硬管力学行为  

Mechanical characteristics on long lifting pipeline in deep-ocean mining considering fluid-structure interaction

作　　者：李艳[1,2] 贾广成[1] 刘少军[1,2] 

机构地区：[1]中南大学机电工程学院,湖南长沙410083 [2]深海矿产资源开发利用技术国家重点实验室,湖南长沙410012

出　　处：《中南大学学报（自然科学版）》2016年第11期3670-3676,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51104177);国家高技术研究发展计划(863计划)项目(2012AA091201)~~

摘　　要：利用Workbench软件建立深海采矿长输流硬管的流固耦合有限元模型，研究管长、顶端张力等因素对其固有频率的作用效果；分别在内流和外流作用下对硬管进行流固耦合动力学仿真，研究内流流速、内流密度、外流流速等对其力学特性的作用。研究结果表明：扬矿硬管的固有频率随着硬管长度的增加而降低，随着硬管所受的顶端张力的增加而增加；在内流作用下，扬矿硬管的最大侧向位移和最大主应力随着内流速度增大而增大，随着内流密度的增大而增大；在外部海流作用下，扬矿硬管的最大侧向位移和最大主应力随着外部海流速度增大而增大；为确保扬矿子系统高效平稳地工作，建议内流流速在合适的区间（如2.5-3.5 m/s）内变动，且整体深海采矿系统应在外部海流速度小于0.8 m/s条件下作业。The influence of pipe length and top tension on the natural frequency of lifting pipeline was investigated based on the finite element model of fluid-structure interaction with Workbench software. In order to examine the influence of internal fluid velocity, internal fluid density and outflow velocity on the mechanical characteristics of lifting pipeline, dynamic simulations of fluid-structure interaction of lifting pipeline under the action of internal fluid and outflow were carried out. The results show that the natural frequency of lifting pipeline increases with the increase of top tension and the decrease of pipe length. With the impact of internal fluid, the maximum lateral displacement and the maximum principal stress of lifting pipeline increase with the increase of the velocity and density of the internal fluid. Under the influence of outflow, the maximum lateral displacement and the maximum principal stress of lifting pipeline increase with the increase of the velocity of the outflow. In order to ensure the safety and improve the efficiency of the lifting system, the velocity of the internal fluid must be controlled in suitable range （e.g. 2.5？3.5 m/s）. The deep-ocean mining system should work with the velocity of outflow less than 0.8 m/s.

关 键 词：深海采矿 扬矿硬管 流固耦合 力学行为 

分 类 号：TD807[矿业工程—矿山开采]