液体燃料横向射流雾化数值模拟研究  

Numerical Simulation of Transverse Jet Atomization of Liquid Fuel

作　　者：刘晶晶 叶桃红[1] LIU Jingjing;YE Taohong(Department of Thermal Science and Energy Engineering,University of Science and Technology of China,Hefei 230027,China)

机构地区：[1]中国科学技术大学热科学与能源工程系,安徽合肥230027

出　　处：《工业加热》2022年第2期53-58,63,共7页Industrial Heating

摘　　要：基于混合欧拉-拉格朗日框架,采用流体体积(VOF)耦合拉格朗日算法对液气密度比为311,不同射流动量通量比q(分别为10和40)和不同气体韦伯数We_(g)(分别为33、470和800)下航空煤油(Jet A)射入横向气流中的雾化特性和流场结构进行了大涡模拟(LES)研究。模拟结果表明:不同工况下的射流穿透深度均与经验关系式对比良好,且随射流动量通量比增加,射流穿透深度增加。通过对液滴平均直径和速度分布的分析,气体韦伯数为33的模拟结果与实验结果较为吻合,同时发现气体韦伯数较小时(We_(g)为33),液滴形成机制为多模式破碎;气体韦伯数较大时(We_(g)分别为470和800),液滴形成机制为剪切破碎。此外,在射流柱下游区域,气相流场中存在回流区结构。Based on the hybrid Eulerian-Lagrangian framework, the fluid volume method(VOF) coupled Lagrangian algorithm is used to investigate the atomization characteristics and flow field structure of Jet A fuel injection into crossflow with a liquid-to-gas density ratio of 311, different jet-to-crossflow momentum flux ratio(q is 10 and 40 respectively) and different gas Weber number(We_(g)is 33, 470 and 800 respectively) by large eddy simulation(LES). The results show that the jet penetration depths agree well with the empirical formulas under different conditions, and the jet penetration depth increases with the increase of jet momentum flux ratio. Through the analysis of the droplet average diameter and velocity distribution, the simulation result of gas Weber number of 33 is in good agreement with the experimental result. Meanwhile, it is found that the droplet formation mechanism is multi-mode breakup when the gas Weber number is smaller(We_(g)is 33);the mechanism of droplet formation is shear breakup when the Weber number of gas is larger(We_(g)is 470 and 800 respectively). In addition, in the downstream region of jet column, there are recirculation zones in the gas flow field.

关 键 词：流体体积耦合拉格朗日算法 射流 横向气流 雾化 大涡模拟 

分 类 号：TQ517.4[化学工程]