摘要
为模拟活化器内液滴对颗粒的捕捉过程,对离散相采用同时跟踪技术,在Euler/Lagrangian坐标系下建立了液滴捕捉颗粒的概率模型,液滴对颗粒的捕捉通过单元捕捉概率来判断。预报了颗粒的浓度场分布及液滴、颗粒和气相场的速度矢量分布。模拟结果表明由于小粒径颗粒跟随流线能力较强及与液滴碰撞面积较小,其捕捉效率比大粒径颗粒要低;在雾化喷嘴出口附近由于相间速差较大,颗粒单元捕捉概率较大。依据模拟结果,对颗粒被捕捉的动力学机理进行了分析。
In order to simulate the process of droplets catching particles, the motions of discrete phases are tracked simultaneously. The probability model of droplets catching particles in the frame of the Euler/Lagrangian approach is introduced, and the particles being caught or not is judged by the catching probability in cell. The velocity of each phase, as well as the concentration distribution of particles are predicted by model calculations. The simulation results show that small particles is more difficult caught, the catching efficiency of small particles is low than large particles. As a result of the obvious velocity difference of interphase, the catching probability in cell is great in the vicinity of the atomizer nozzle. The mechanism of particles being caught by droplets is analyzed according to simulation results.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2005年第11期85-89,共5页
Proceedings of the CSEE
基金
国家自然科学基金项目(90210016)~~
