高溜井卸矿冲击气流产生规律及其影响因素的数值模拟

高溜井卸矿过程中产生的冲击气流是卸矿硐室及其附近巷道产尘的主要原因，本文采用考虑气固两相间双向耦合作用及颗粒间碰撞作用的密相DPM模型进行模拟，对气相和颗粒相分别采用欧拉法和拉格朗日法建立控制方程，数值模拟研究高溜井卸矿时冲击气流产生及其与各影响因素之间的关系。计算结果表明：冲击风速随卸矿流量的增加而增加，但其增幅随卸矿流量增加而减小，最大冲击风速与卸矿流量成近似幂函数关系，且卸矿高度越大，幂指数越大，模拟得幂指数范围为0.593~0.732；卸矿高度越高，冲击气流越大，且最大冲击气流与卸矿高度的1.05次方近似成正比；矿石粒径越大，冲击气流越小，最大冲击风速与矿石粒径的-0.63次方近似成正比；多中段同时卸矿时，各中段产生的流场会相互作用，从而降低冲击气流的叠加。

Numerical simulation of impact air flow generation and its influencing factors when unloading ore in high ore pass

Impact air flow is the main cause of producing dust in ore dumping chamber and adjacent tunnel when unloading ore in high ore pass.In this paper,the Dense DPM model is adopted to consider the interaction between gas and solid and the interaction of particles collisions.Euler equations are established for gas phase,Lagrangian methods are established for discrete particle and the numerical calculation are made to figure out the impact air flow when unloading ore in high ore pass and the relationship between it and the various influencing factors.The results show that the impact speed increases but the speed growth rate decreases with the unload ore flow increases,the relationship between maximum impact speed and unload ore flow remains approximately power function,the higher the unloading height,the larger the power exponent,and the range of the experimental power exponent is 0.593~0.732.The impact air flow becomes greater with the increase of unloading height and the maximum air flow is approximately proportional to 1.05th power of the height.The impact air flow becomes smaller with the increases of ore particle size and the maximum is approximately proportional to -0.63th power of the particle size.When several middle segments unloading together,the multiply of impact air flow will be reduced due to the flow interaction produced from these middle segments.