深海采矿全流向试验设施造流仿真研究

Numerical Simulation of Current Generation in Deep-Sea Mining Circumferential-Flow Test Facility

为优化深海采矿试验设施造流区域流速分布,采用计算流体力学软件对试验设施的造流测试区进行了二维模拟。模拟结果显示:7台送水水泵,7台回水水泵的方式,能够在圆形试验设施中央10m×10m范围内形成0.25m/s和0.05m/s平均流速的测试区,并且两种工况下的湍流强度都可以控制在10%以下。通过研究可得出结论:采用中间流量稍小,两侧逐渐增大的造流方式,可在圆形试验区中央区域形成从0.05 m/s~0.25 m/s范围内的水流速度,均匀度可控制在±10%以内,且湍流度可控。

Computational fluid dynamics(CFD)method is introduced to optimize current velocity profiles in a measuring area of a deep-sea mining test facility.The results show that relying on 7 water supply pumps and 7 backwater pumps,a 10 m×10 m measuring area with an average flow velocity of 0.25 m/s and 0.05 m/s is formed in center of the circular testing facility.All of the above two working conditions can reach a turbulence intensity which is under 10%.It is concluded that a water flow velocity ranging from 0.05 m/s to 0.25 m/s can be formed in the central area of the circular test area by using a slightly smaller flow rate in the middle and gradually increasing on both sides.Velocity uniformity can be controlled within±10%,and turbulence intensity is controllable.