Experimental study of spatial distribution of knock events in a turbocharged spark-ignition engine

涡轮增压器 点火系统 SPARK(编程语言) 发动机爆震 汽车工程 环境科学 均质压燃 工程类 计算机科学 燃烧 航空航天工程 气体压缩机 燃烧室 化学 有机化学 程序设计语言
作者
Shuo Meng,Zhiyu Han,Benzheng Fan,Zhenkuo Wu,Qiang Shao,Laihui Tong
出处
期刊:International Journal of Engine Research [SAGE]
卷期号:25 (7): 1251-1264 被引量:1
标识
DOI:10.1177/14680874241227552
摘要

An experimental investigation on the spatial distribution of knock events in a turbocharged spark-ignition engine for hybrid vehicle applications was conducted by using a multichannel fiber optic method. The knock positions were detected under different conditions to investigate the influence of crucial engine design and operating parameters on the knock characteristics including the spatial distribution in the combustion chamber and its relationship to knock intensity. The measured data reveal that the spatial distribution in the engine with a port fuel injection (PFI) system is mainly located on the exhaust side with insignificant influence of engine speed and load, which is attributed to the elevated thermal load around the exhaust valves. However, the knock events under gasoline direct-injection (DI) conditions were found to occur in more scattered locations with more occurring on the engine front-end and rear-end sides. These results indicate that the in-cylinder fuel-air mixing process may have a significant impact on the knock occurrence spots under DI conditions. The knock positions of the engine with different excessive air ratios, injection timings, and intake-valve timings were also detected, indicating that engine operating parameters have complex influences on the knock-region distribution in a DI engine. In addition, experiments were also carried out in two different cylinders to verify the cylinder-to-cylinder variations in knock regions which may be caused by the engine cooling design. Furthermore, no apparent correlations were observed between the knock position and the knock intensity by analysis of the experimental data.
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