柴油机燃烧过程的数值模拟及燃烧室改进  

Numerical simulation for combustion process of diesel engine and improvement of combustion chamber

作　　者：潘剑锋[1] 卢青波[1] 王谦[1] 万彦辉[1] 张梦云[1] 

机构地区：[1]江苏大学能源与动力工程学院,江苏镇江212013

出　　处：《江苏大学学报（自然科学版）》2012年第4期390-395,共6页Journal of Jiangsu University：Natural Science Edition

基　　金：江苏省科技支撑计划项目(SBE201000356);江苏高校优势学科建设工程项目;江苏省"六大人才高峰"项目(2011-ZBZZ-27)

摘　　要：为了改善柴油机燃烧室内混合气的形成状态和燃烧质量,对改装DLH1105型直喷柴油机缸内喷雾和燃烧过程进行了动态数值模拟,并在压缩比不变的情况下设计了3种不同结构的燃烧室,分别为敞口型、直口型和缩口型.通过STAR-CD软件对3种结构的燃烧室进行了三维数值模拟,获得了柴油机的缸内流场、燃油质量分数分布和温度场.结果表明:模拟出的缸内喷雾和燃烧过程与可视化试验的结果吻合,计算模拟的方法可靠;缩口型燃烧室有较强的挤流强度,较长的涡流持续期,使混合气质量和燃烧性能优于直口燃烧室和敞口燃烧室,缸内压力和平均温度最高,Soot生成量最少,同时NO的生成量最大.In order to improve the mixture formation and combustion quality in combustion chamber of DLH1105 diesel engine,the cylinder spray and combustion process were numerically simulated.Three combustion chambers of open combustion chamber,toroidal combustion chamber and reentrant combustion chamber were designed at constant compression ratio.3-D numerical simulation of the three type combustion chambers were achieved by STAR-CD software to obtain flow field,distribution of fuel mass fraction and temperature field in the diesel engine cylinder.The simulation result shows that cylinder spray and combustion process are consistent with those of visualized experiment,which means that the method of computational simulation is reliable.Reentrant combustion chamber has strong squish with long swirl period,which results in better mixture gas and combustion performance than those of toroidal combustion chamber and open combustion chamber.The pressure and temperature in reentrant combustion cylinder are high with low shoot formation and high NO amount.

关 键 词：直喷式柴油机 燃烧室 高速摄影 数值模拟 燃油质量分数分布 温度场 

分 类 号：TK422[动力工程及工程热物理—动力机械及工程]