燃烧室参数对某柴油机高功率密度-快速燃烧性能的研究  

Study of Combustion Chamber Parameters on Performance of Rapid Combustion of a High Power Density Diesel Engine

作　　者：李树宇 续彦芳[1] 刘若凡[1] 毛虎平[1] LI Shu-yu;XU Yan-fang;LIU Ruo-fan;MAO Hu-ping(North University of China,Taiyuan 030051 ,P. R. China)

机构地区：[1]中北大学机械与动力工程学院,太原030051

出　　处：《科学技术与工程》2016年第30期216-220,226,共6页Science Technology and Engineering

基　　金：国家自然科学基金项目(51275489)资助

摘　　要：为了研究燃烧室参数对某高功率密度单缸机快速燃烧的影响,保证压缩比不变的前提下,建立了三种不同径深比的燃烧室方案,采用AVL FIRE软件对该单缸机燃烧过程进行了模拟计算;分析了径深比对气流分布、喷雾特性以及燃烧性能的影响,仿真结果表明:径深比由3.49变化到5.73的过程中,湍流混合速率先增大后减少,湍动能下降,挤流区域处的速度值降低,喷雾贯穿距增加,油束向凹坑壁面发展,剩余液态燃油量增加;径深比为4.40的Ⅱ型燃烧室动力性能较好,更有利于扩散燃烧。To study the effects of combustion chamber parameters on rapid combustion of a high power density single-cylinder engine,under the condition of the same compression ratio,three combustion chamber schemes with different diameter depth ratio were established.Then using AVL_Fire,it simulates combustion process of the single cylinder Diesel engine,analysis the influences of air distribution,spray characteristics and combustion characteristics with diameter-depth ratio.Simulation results show that,when diameter-depth ratio varies from3.49to5.73turbu-lent mixing rate increased first and then decreased,turbulent kinetic energy decreased,squeeze flow value de-creased,spray penetration distance increased,oil beam developed to the pit wall,the remaining liquid fuel quantity increased.II type combustion chamber had better dynamic performance and more benifited to the diffusion combus-tion.

关 键 词：径深比 燃烧室参数 高功率密度柴油机 快速燃烧 

分 类 号：TK421.2[动力工程及工程热物理—动力机械及工程] TH16[机械工程—机械制造及自动化]