横向射流破碎机理与雾化特性  

The breakup mechanism and atomization characteristics of lateral jet

作　　者：李渝丽 LI Yuli(Mcchatronics Engineering,Shanxi Institute of Energy,Jinzhong 030604,China)

机构地区：[1]山西能源学院机电工程系,山西晋中030604

出　　处：《内燃机与动力装置》2024年第6期13-19,共7页Internal Combustion Engine & Powerplant

摘　　要：为增强燃油与空气的混合均匀性,提高横向射流雾化效果,从破碎模式与表面波形成机理、雾化影响因素两方面分析横向射流研究现状,并结合目前研究不足,展望未来发展方向。结果表明:破碎模式由液气动量通量比与韦伯数共同决定;射流柱受瑞利-泰勒(Rayleigh-Taylor,RT)不稳定性和开尔文-赫姆霍兹(Kelvin-Helmholtz,KH)不稳定性共同作用发生变形形成表面波;气液剪切产生KH不稳定波,使射流主要产生表面破碎;气液挤压产生RT不稳定波,使射流主要产生柱状破碎;液体韦伯数、液气密度比、射流入射角、射流孔径与孔型、射流模式对液滴雾化均有不同程度的影响,但无法单一定性评价,需结合具体情况分析。未来横向射流研究应尽可能向试验工质、试验条件及环境接近发动机实际燃烧的方向改进,同时,应考虑涡旋、不同脉冲频率及射流波形对横向射流的影响。In order to enhance the uniform of fuel and air mixing and improve the atomization effect of lateral jet,the current research status of lateral jet is analyzed,The discussion is carried out from two aspects:the breakup mode and the mechanism of surface formation,and the influencing factors of atomization.Moreover,the future research directions are prospected in view of the current research shortcomings.The results show that the breakup is determined by the ratio of liquid to gas momentum flux and the Weber number.The jet column is deformed by the combined action of Rayleigh-Taylor(RT)and Kelvin-Helmholtz(KH)instability form surface waves.The gas-liquid shear generates KH instability waves,causing the jet to mainly break up on the surface.The gas-liquid squeeze generates RT waves,causing the jet to mainly break up in a columnar manner.The liquid Weber number,the ratio of liquid to gas density,the injection angle of jet,the diameter and shape of the jet orifice,and the jet mode all have different effects on the atomization of droplets.However,it is to make a single qualitative evaluation,and specific situations need to be analyzed in combination.Future research on lateral jets should be improved as much as possible towards the combustion conditions of engines,while considering the impact of vortices,different pulse frequencies,and jet wave forms on lateral jets.

关 键 词：横向射流 破碎机理 雾化特性 表面波 

分 类 号：TK401[动力工程及工程热物理—动力机械及工程]