深海采矿扬矿硬管内高速螺旋流当地浓度的研究

针对深海采矿扬矿硬管内高速螺旋流提升大洋锰结核颗粒的当地浓度受多种因素影响的问题，基于欧拉-欧拉理论模型，选用SIMPLE算法和RNGk-ε湍流模型，以含有锰结核颗粒的海水为流动介质，对扬矿硬管内液固两相流进行数值模拟，分析了管道、物料和浆体的特性等因素对颗粒当地浓度的影响规律。结果表明：不同工况条件下，管道内径、锰结核颗粒粒径、颗粒密度、提升角速度、提升浓度的增大均有助于提高颗粒的当地浓度，进而有利于提高颗粒的输送效率；过大的提升速度将会抑制断面上颗粒当地浓度的提高，从而降低颗粒的输送效率和提升能力；但管壁粗糙度及浆体黏度对当地浓度影响很小。研究结果对深海采矿扬矿硬管内高速螺旋流的输送参数优化和工程应用具有一定的指导意义。

Study on Local Concentration of High-speed Spiral Flow in Lifting Pipe for Deep-sea Mining

The local concentration of the ocean manganese particles increased by high-speed spiral flow in deep-sea mining lifting pipe is affected by various factors.In view of this issue，based on euler-euler theory，and with the sea water containing manganese particles as flow medium，the solid-liquid two-phase fluid was numerically simulated，along with the algorithm SIMPLE and the turbulence model RNG.And the variation of local concentration of particles influenced by pipe features，material properties and slurry characteristics was analyzed.The results showed that under different working conditions，the increase of pipe diameter，particle size，particle density，angular velocity and manganese particles concentration were all conducive to the improvement of local concentration，and then the transport efficiency could be enhanced.And excessive lifting speed inhibited the local concentration of particles，thus，the transport efficiency and lifting capacity reduced.However，the pipe wall roughness and slurry viscosity have little impact on the local concentration.The research results has definite guiding significance for optimization of transport parameters and engineering applications of high-speed spiral flow in lifting pipe for deep-sea mining.