摘要
在OpenFOAM框架下,基于可压缩双流体模型,应用界面压缩法捕捉气液界面,采用大涡模型处理高速射流中的湍流流动,验证了文献中锥形喷嘴的质量流量和喷雾动量通量实验数据,数值结果和实验数据吻合较好,并在此基础上对射流破碎的机理进行了分析.为分析喷嘴几何结构对破碎的影响,修改ECN spray D喷嘴的出口直径,得到圆柱形喷嘴,结果发现圆柱形喷嘴的液柱破碎较弱,液核长度较长,因此喷嘴具有一定的锥度可以促进喷嘴出口的射流破碎.
Based on the compressible two-fluid model,the interface compression method is applied to capture the gas-liquid interface in the OpenFOAM frame work,and the large eddy simulation model is used to treat the turbulent flow in the high-speed jet,which verifies the experimental data of mass flow rate and spray momentum flux of conical nozzle in the literature.The numerical results and the experimental data are in good agreement,and the mechanism of jet breakup is analyzed on this basis.In order to analyze the effect of nozzle geometry on jet breakup,the cylindrical nozzle is obtained by modifying the outlet diameter of the conical spray Dnozzle from ECN.It is found that the cylindrical nozzle is weak in the breakup of liquid column and the length of the liquid core is longer.Therefore,the nozzle which has a certain taper tends to promote the jet breakup at the nozzle outlet.
作者
张威龙
刘灿旭
刘红
贾明
奚溪
Zhang Weilong;Liu Canxu;Liu Hong;Jia Ming;Xi Xi(Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education,School of Energy and Power Engineering,Dalian University of Technology,Dalian 116024,China)
出处
《燃烧科学与技术》
EI
CAS
CSCD
北大核心
2020年第4期310-315,共6页
Journal of Combustion Science and Technology
基金
国家自然科学基金资助项目(91641117,51961135105)
天津大学内燃机燃烧学国家重点实验室开放基金资助项目(K2018-04)。
关键词
双流体模型
大涡模拟
射流破碎
界面压缩法
two-fluid model
large eddy simulation model
jet breakup
interface compression method
