摘要
采用改进的DSM大涡模型模拟气相湍流流动,采用颗粒轨道模型模拟颗粒运动,在双向耦合气固湍流数理模型基础上,采用蒙特卡洛方法Tanaka模型进行颗粒碰撞计算,取得相同颗粒数量下不同粒径的固体颗粒随湍射流运动对气相射流的调制规律及颗粒弥散规律。结果表明,较大粒径的颗粒加强了气流刚性,由于颗粒惯性较大,对冲碰撞使颗粒在碰撞滞止点聚集,使流场中颗粒相浓度分布不均;中等粒径的颗粒对气相耗散较小,颗粒受到离心力主导影响,碰撞后仍沿涡的外围扩散;较小粒径的颗粒对气相耗散严重,颗粒跟随性好,大多聚集在涡核内,碰撞后仍随气体向外扩散,在流场中分布均匀。
Two-way coupling large eddy simulation was used to simulate the gas-solid co-flows on opposed turbulent round jets in this paper. At a given particle mass flux ratio, the effects of laden particles on turbulent gas modulation and those of gas on particle dispersion were systematically studied at different particle sizes. The results indicate that the rigidity of the gas phase is strengthened by large particles as the inertia of large particles is relatively greater. Particles accumulate around the stagnation point of collision which leads to the uneven distribution of the flow field. As the dissipation rate to the gas phase is small, middle particles are dominated by the centrifugal force and still diffuse along the periphery of eddy after the collision. The following feature of small particles is better as the dissipation rate to gas phase is more intense. And most of the small particles accumulate in the core of the eddy. Small particles dissipate along with the gas phase after the collision and distribute evenly in the flow field.
作者
耿察民
蒋骏
任少君
GENG Cha-min;JIANG Jun;REN Shao-jun(Jiangsu Frontier Electric Technology Co.,Ltd,Nanjing Jiangsu 211102,China;State Grid Jiangsu Electric Power Engineering Consulting Co.,Ltd,Nanjing Jiangsu 210008,China;Energy and Environment School,Southeast University,Nanjing Jiangsu 210096,China)
出处
《计算机仿真》
北大核心
2021年第11期67-72,共6页
Computer Simulation
关键词
气固圆湍对撞流
大涡模拟
湍流特性
颗粒弥散
Opposed turbulent round jets
Large eddy simulation
Turbulent flow behavior
Particles dispersion
