燃烧室参数对某柴油机高功率密度_快速燃烧性能的研究

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。

Study of combustion chamber parameters on performance of rapid combustion of a high power density diesel engine

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 from 3.49 to 5.73,turbulent mixing rate increased first and then decreased, turbulent kinetic energy decreased,squeeze flow value decreased,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 combustion.