中文摘要：

针对水力旋流器内流场运动复杂、沙粒运动规律难以掌握的问题,运用基于颗粒动力学理论的欧拉-拉格朗日液固多相湍流模型,对水力旋流器内的水沙两相三维流动进行了CFD-DEM耦合数值模拟研究,分析了水力旋流器内单个沙粒的轨迹线、速度和沙粒群的运动规律、分布特性等。模拟结果表明,沙粒粒径越小,沙粒向下运行的距离越短,越容易从下降流中进入到上升流中,越难以分离。粒径为40μm的沙粒,在圆柱体与圆锥体交界面处出现沙粒峰值,分离效果易受影响,而50μm和60μm沙粒在圆锥体部分出现峰值,具有较好的分离效果。通过跟踪单个沙粒和沙粒群的运动可知,沙粒在圆柱体内主要作圆周运动,进入到圆锥体部分,沙粒既有圆周运动,又有明显的进入沉沙口的直线运动。分析大量沙粒个体和群体运动以及群体分布情况能从微观角度了解水力旋流器的分离效率,是水力旋流器性能研究的有效手段。

英文摘要：

Due to the complexity of the fluid field in hydrocyclone and the difficulty of mastering the law of sediment motion,an Eulerian-Lagrange liquid-solid multiphase turbulence model combined with the kinetic theory of granular flow was used to carry out simulation based on coupled CFD-DEM watersediment two-phase flow in a hydrocyclone,which analyzed the trochoid and speed of single sediment,speed of sediment group,the moving pattern and distribution of sediment group. The simulation results show that the smaller the sediment size was,the closer the distance was,the more easily uprising from downward trend to upstream,and the more difficult to be separated. For the particles of 40 μm in diameter,sediment peak appeared in the interface of cylinder and cone and the separation effect of sediment was easy to be affected. But for the particles of 50 μm and 60 μm,sediment peak appeared in cone part and sediment had a better separation effect. Through tracking single sediment and sediment group,it can be found that the sediment almost stay in circular motion in cylinder. In cone part,sediment not only stays in circular motion but also obviously runs in line movement when they enter insediment settling. Analyzing the moving pattern and distribution of single sediment and sand group provides a microscopic method for understanding separation efficiency and also provides an effective research method for the further study of the hydrocyclone performance.