中文摘要：

使用高速摄影可视化方法研究了快速压缩机内异辛烷空气混合气在压缩终点点火后的燃烧及爆震过程,分析了不同末端混合气自燃模式与发动机内的爆震形式之间的关系,研究了点火位置和热力条件对末端混合气燃烧模式的影响。结果明确了发动机的超级爆震是缸内产生爆轰的结果,点火位置对末端混合气燃烧模式的影响较弱,但混合气的能量密度对燃烧模式有重要影响。

英文摘要：

This paper presents the combustion and knock process of iso-octane/air mixture in a rapid compression machine （RCM）. The mixture is ignited right after the end of compression, and then the flame propagation and the auto-ignition of end gas are recorded using high speed photography. The relationship between knock type in boosted engine and the end gas auto-ignition mode in RCM is analyzed according to the obtained combustion images. The effects of spark ignition position and the thermodynamic conditions at the spark timing on the auto-ignition mode are investigated. The results show that super knock in engine is caused by detonation of end gas. The auto-ignition mode is effected weakly by the spark ignition position but is significantly affected by mixture energy density.