CNG发动机火核形成和发展的三维数值模拟研究  

THREE-DIMENSIONAL MODELING OF THE FLAME KERNEL FORMATION AND DEVELOPMENT IN A CNG ENGINE

作　　者：虞育松[1] 李国岫[1] 姚宝峰[1] 

机构地区：[1]北京交通大学机电学院动力工程系,北京100044

出　　处：《工程热物理学报》2006年第z2期151-154,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.50406003)

摘　　要：本文利用三维燃烧模型对CNG发动机的燃烧过程进行数值模拟,研究过量空气系数的循环变动对CNG发动机火核形成和发展及燃烧各阶段的影响。研究结果显示,过量空气系数的变动对初始火核参数的影响非常小,对燃烧过程三个阶段的影响程度也不同。主燃烧阶段受过量空气系数的变动的影响最大,火核形成和发展阶段受过量空气系数的变动的影响很小。过量空气系数的变动不是火核形成和发展产生变动的主要原因。In this paper, three-dimension models have been used to simulate the combustion processes in CNG engine, in order to study the effects of cyclic equivalence ratio variations on flame kernel formation and development. The computational results indicate that cyclic equivalence ratio variations have little effects on initial kernel characteristics, and have different influences on the subsequent three combustion stages. The equivalence ratio variations mostly affect the main stage of combustion and hardly influence initial kernel development stage. It is concluded that cyclic equivalence ratio variations is not the main reason for the cyclic flame kernel formation and development variations.

关 键 词：CNG发动机 燃烧循环变动 三维燃烧模型 

分 类 号：TK16[动力工程及工程热物理—热能工程]