双股液体射流撞击雾化的SPH方法数值模拟  

NUMERICAL SIMULATION OF TWO LIQUID IMPINGING JETS WITH SPH METHOD

作　　者：韩亚伟[1] 强洪夫[1] 刘虎 

机构地区：[1]第二炮兵工程大学601室,陕西西安710025

出　　处：《工程力学》2013年第3期17-23,共7页Engineering Mechanics

基　　金：国家教育部NCET项目(NCET-4138C2XB);第二炮兵工程大学创新性探索研究项目(EPXY0806)

摘　　要：双股液体射流撞击雾化过程存在复杂的界面运动,传统网格法很难处理。运用SPH方法对双股液体射流撞击雾化问题进行三维数值模拟;根据实际的双股液体射流撞击雾化过程提出了合理的简化模型;弱可压缩状态方程中参考压强采用了新的计算公式;利用有限差分与SPH一阶导数相结合的方法处理粘性项中的二阶导数;对人工应力提出了新的参数值选择方案。将数值仿真结果与文献实验结果进行对比,二者比较吻合,表明SPH方法很适合解决射流撞击雾化等复杂的界面运动问题。The atomization process of two liquid impinging jets has complex interface moving, which is difficult to solve with traditional grid-based methods. In this paper, the problem of two liquid impinging jets and atomization was simulated with three-dimensional Smoothed Particle Hydrodynamics （SPH） method. A simplified model is proposed according to the practical process of two impinging jets and atomization, and a new formula of reference pressure is used to compute state equation. A hybrid expression, combining a standard SPH first derivative with a finite difference approximation of a first derivative, is used to replace the second derivative item in the viscosity, while the parameters in artificial stress are redefined. Compared with experimental results, the simulation results are found to be in good agreement with them. It is proved that this proposed method is suitable to solve the problems of complex interface moving such as liquid impinging jets.

关 键 词：光滑粒子流体动力学 雾化过程 液体射流撞击 粘性 人工应力 

分 类 号：O358[理学—流体力学]