摘要
为了研究封闭空间中湍流强度与火焰传播相互作用,基于快速压缩机试验平台建立了燃烧室模型,开展了上止点缸内压力1.1MPa和1.4MPa及不同湍流强度下,异辛烷-空气当量比混合气点火和火焰传播过程的三维大涡模拟研究。研究结果表明:火焰发展受到周围湍流脉动的影响,火焰形态发生褶皱和变形,且随着湍流强度的增加,火焰表面褶皱和变形越发严重;同时火焰的褶皱和变形会进一步加剧湍流脉动,从而加强火焰和湍流脉动的相互作用,影响缸内的燃烧情况。
In order to study the interaction between turbulent intensity and flame propagation in closed space,3D numerical simulation of ignition and flame propagation process in the equivalent ratio mixture of isooctane and air was carried out under the in-cylinder pressure of 1.1 MPa and 1.4 MPa and different turbulent intensity by using a combustion chamber model established based on the experimental platform of rapid compression machine.The results show that the shape of flame becomes wrinkled and deformed due to the effect of turbulence fluctuation around the flame,which becomes more serious with the increase of turbulence intensity.The wrinkles and deformations of flame will intensify the turbulence fluctuation so that the interaction between flame and turbulence fluctuation strengthens,therefore influence the in-cylinder combustion.
作者
刘宗宽
刘昌文
卫海桥
周磊
LIU Zongkuan;LIU Changwen;WEI Haiqiao;ZHOU Lei(State Key Laboratory of Engines,Tianjin 300072,China)
出处
《车用发动机》
北大核心
2019年第4期22-26,33,共6页
Vehicle Engine
基金
国家重点研发计划资助项目(2017YFB0103400)
关键词
湍流脉动
火焰传播
大涡模拟
燃烧
turbulent fluctuation
flame propagation
Large Eddy Simulation (LES)
combustion
