气动喷射数值仿真分析

利用CFD软件Fluent建立数学物理模型,运用欧拉法和拉格朗日方法相结合的计算模型对离散相模型(DPM)进行三维数值模拟。研究当进口处空气速度为60m/s时,不同直径的固体颗粒在喷管外部流场的轨迹和横截面上的分布。仿真得到以下结论:在固体颗粒从喷管喷出后短距离内,固体颗粒大体上呈现圆锥状喷射,喷射的锥角随颗粒的减小而逐步减小;颗粒直径减小时,长轴半径接近短轴半径,逐步过渡为圆形。

Pneumatic Jet Numerical Simulation

The simulation idea of CFD software Fluent was adopted,and the mathematical physical model was established, and by the calculation model combining Euler method and Lagrange method, three-dimensional numerical simulation was applied to discrete phase model （DPM）. Different diameter of solid particles on the outside of the nozzle flow field on the particle trajectories and the distribution of solid particles on cross section mainly were studied, under the circumstance of the inlet air speed of 60 m/s. Through the simulation the following conclusion was got：within short distance after solid particles ejected from nozzle, solid particles generally presented the conical spray, spray cone angle increased gradually with the reduction of particle diameter decreasing ; with the particle diameter decreasing,long axis radius is closer to the short axis radius, gradually transforming to the circular.