基于VOF-LPT模型的强旋来流条件横向射流破碎雾化特征研究  被引量:1

Breakup and Atomization Characteristics of Liquid Jets in Strong Swirling Crossflow Based on the VOF⁃LPT Method

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作  者:谢名云 濮天昊 刘洪[1] 吴胜奇 XIE Mingyun;PU Tianhao;LIU Hong;WU Shengqi(School of Aeronautics and Astronautics,Shanghai Jiao Tong University,Shanghai 200240,P.R.China;Sichuan Research Institue,Shanghai Jiao Tong University,Chengdu 610500,P.R.China)

机构地区:[1]上海交通大学航空航天学院,上海200240 [2]上海交通大学四川研究院,成都610500

出  处:《应用数学和力学》2023年第9期1054-1069,共16页Applied Mathematics and Mechanics

基  金:国家自然科学基金重大研究计划项目(91941301);上海市自然科学基金项目(22ZR1433700);四川省自然科学基金项目(2022NSFSC1893)。

摘  要:研究强旋来流条件横向液体射流的破碎雾化特征对先进航发燃烧室设计具有重要意义.该文采用Euler-Lagrange方法模拟了射流破碎雾化过程,基于VOF(volume of fluid)方法捕获了近场射流破碎过程中相界面的拓扑结构变化,通过Lagrange粒子追踪(LPT)方法模化喷雾液滴的动力学过程得到远场油雾分布特征.该研究构建了不同旋流强度横向来流,旋流数从0变化至2.5,射流与气流的动量比q为10,来流We数为39.在该工况下,射流破碎过程包含柱状破碎和表面破碎.结果表明,由Kelvin-Helmholtz(KH)不稳定诱导的轴向波的发展是射流发生柱状破碎的主要原因,而射流分支/液膜从液柱表面剥离形成了射流的表面破碎,其主要由方位剪切不稳定波主导.强旋流加速了射流的柱状破碎过程,降低了破碎位置的径向高度,但旋流延迟了射流的表面破碎过程,破碎开始位置的径向高度随旋流数增大而升高.随着旋流数的增大,流向方向速度分量不断减小,射流沿径向方向的喷注轨迹显著升高;射流的偏转角度与流向位置呈线性关系,旋流数越大偏转斜率越大.此外,射流雾化场的Sauter直径(SMD)随旋流数的增加而减小,液雾场的空间分布区域也随旋流数的增加而增大.The liquid jet breakup and atomization interacting with a strong swirling crossflow is of significance in designing advanced aeroengines.The Eulerian⁃Lagrangian method was utilized to simulate the jet breakup and atomization processes.The volume of fluid(VOF)method was employed to track the gas⁃liquid interface topology evolution during the jet breakup,while the Lagrangian particle tracing(LPT)method was used to track the discrete droplets and obtain the information on far⁃field liquid dispersion.The crossflow was designed with dif⁃ferent swirl numbers,ranging from 0 to 2.5.Momentum ratio q between the liquid jet and the air flow was set to 10,and the gas Weber number was 39.Under these conditions,both the column and shear breakups were ob⁃served.The results indicate that,the development of axial waves induced by the Kevin⁃Helmholtz(KH)insta⁃bility was the main cause for column breakup.During the surface breakup,ligaments and small liquid jet bran⁃ches were stripped from the liquid jet surface,primarily driven by azimuthal shear waves.The strong swirling airflow enhances the jet column breakup process,leading to a lower radial height for the breakup location and a shorter breakup time.However,as the swirl number increases,the radial height of the onset of breakup would increase,which suggests the swirl flow would delay the surface breakup of liquid jets.With the increase of the swirl number,the velocity component in the flow direction decreases,and the jet trajectory in the radial direction increases significantly.The deflection angle of the jet shows a linear relationship with the position of the flow direction,with larger air swirl numbers resulting in a steeper slope.Furthermore,as the swirl number increases,the Sauter mean diameter(SMD)of the entire spray field would decrease,and the liquid dispersion would increase.

关 键 词:旋流气流 横向射流 VOF LPT 破碎雾化特征 

分 类 号:O358[理学—流体力学]

 

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