火花点火发动机爆震燃烧特性的研究

本介绍了采用高速摄影法和同步记录气缸压力示功图，对火花点火发动机机爆震燃烧特刊物的实验研究。

A Study on the Characterization of Knock in a Spark Ignition Engine

The characterization of knock in a spark ignition engine was experimentally investigated using high speed photography together with the cylinder pressure measurement.The experimental results show that knock is resulted from end gas autoignition,and the pressure wave leading to pressure oscillation inherent in knock is formed due to sharp energy release.The greater the traveling speed of pressure wave,the higher frequency of the pressure oscillation,and the more severe the knock.The energy of pressure oscillating mainly focused on a few ranges of frequency.The higher frequency it focused on,the greater the knock intensity.The state of in cylinder pressure distribution is not identical spatially in chamber.The characteristic parameter of knock varies among cycles under the same condition.It indicated the complexity of knocking combustion,and the effect of different cycles should be taken into account comprehensively when knocking combustion is evaluated.