基于不可压缩光滑粒子流体动力学的单螺杆挤出三维流动数值模拟  

Simulation of the Three-dimensional Flow in the Single Screw Extruder Based on the Incompressible Smoothed Particle Hydrodynamics

作　　者：董添文[1,2] 江顺亮[3] 黄兴元[2] 柳和生[1] 

机构地区：[1]上饶师范学院物理与电子信息学院上饶334001 [2]南昌大学机电工程学院南昌330031 [3]南昌大学信息工程学院南昌330031

出　　处：《机械工程学报》2012年第22期80-86,共7页Journal of Mechanical Engineering

基　　金：国家自然科学基金资助项目(50863003)

摘　　要：基于不可压缩光滑粒子流体动力学(Incompressible smoothed particle hydrodynamics,ISPH)算法,利用FORTRAN语言编程,开发一套模拟三维非牛顿流程序。通过模拟平板Poiseuille流验证ISPH算法计算非牛顿流的正确性。指出在模拟非牛顿流时,采用镜像粒子边界法处理壁边界较采用静态粒子边界法更适合。并利用该程序计算单螺杆挤出三维流场。提出两种入口出口边界设置方法:周期边界法及压力边界法。分析计算结果发现:选取周期边界较压力边界更合理;选取适当粒子分布密度可以同时满足计算效率与计算精度要求;螺槽横截面上形成环流;切应力分布梯度主要集中在左上角和右上角;沿螺槽方向的流动很平稳,然而,随着反向压力梯度的增加,流动受到反向压力梯度的阻碍更加明显。为进一步采用ISPH方法模拟几何形状更加复杂的三维螺杆挤出打下基础。Based on the incompressible smoothed particle hydrodynamics （ISPH） method, a program written in FORTRAN language was developed to simulate three-dimensional non-Newtonian flow. The efficiency of numerical schemes is evaluated by simulating a planar Poiseuille flow. It is pointed out that in the simulation of non-Newtonian flow, the mirror particle boundary treatment of the wall boundary is more suitable than the dummy particle boundary. A single screw extruder three-dimensional flow is calculated using this algorithm. Two types of inflow and outflow boundary implementation schemes including periodic boundary and pressure boundary are elaborated. The results show that the periodic boundary is more feasible than pressure boundary; the algorithm is accurate and fast if an appropriate number of particles is selected; circumfluence form in the cross-section of the groove; shear stress gradient is more concentrated in the top left angle and right angle; the flow along the spiral groove is stable, with the increase of the reverse pressure gradient, the flow bear more resistance. This research laid the foundation for simulating more complex three-dimensional screw extrusion using ISPH method.

关 键 词：不可压缩光滑粒子流体动力学 单螺杆挤出 三维流动 非牛顿流 

分 类 号：TQ320[化学工程—合成树脂塑料工业]