丁以雄,宋运通,刘宗宽,等.高压缩比下扫气式预燃室湍流射流点火对废气再循环稀释汽油机性能影响研究[J].内燃机工程,2023,44(1):52-59.
高压缩比下扫气式预燃室湍流射流点火对废气再循环稀释汽油机性能影响研究
Study on the Effects of Turbulent Jet Ignition of Swept Pre-Combustion Chamber on the Performance of Exhaust Gas Recirculation Diluted Gasoline Engine at High Compression Ratio
DOI：10.13949/j.cnki.nrjgc.2023.01.007
关键词:湍流射流点火  废气再循环  燃烧稳定性  压缩比
Key Words:turbulent jet ignition  exhaust gas recirculation（EGR）  combustion stability  compression ratio
基金项目:国家杰出青年科学基金项目（51825603）
作者单位E-mail
丁以雄* 天津大学 内燃机燃烧学国家重点试验室，天津 300072 dingyixiong1@163.com 
宋运通 天津大学 内燃机燃烧学国家重点试验室，天津 300072  
刘宗宽 天津大学 内燃机燃烧学国家重点试验室，天津 300072  
廖升友 广西玉柴机器股份有限公司，玉林 537000  
周磊* 天津大学 内燃机燃烧学国家重点试验室，天津 300072 lei.zhou@tju.edu.cn 
卫海桥 天津大学 内燃机燃烧学国家重点试验室，天津 300072  
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摘要:基于一台可调压缩比（compression ratio， CR）的单缸发动机和自主设计的湍流射流点火（turbulent jet ignition， TJI）系统，开展高压缩比下扫气式预燃室湍流射流点火对废气再循环（exhaust gas recirculation， EGR）稀释汽油机性能影响的研究。研究发现在高EGR率时，扫气式TJI的点火方式燃烧稳定性最高，可以在EGR率超过30%时实现稳定燃烧。提升压缩比对提升TJI在高EGR率下的燃烧稳定性有积极作用，然而对提升高EGR率下火花塞点火（spark ignition， SI）的稳定性作用不大。对于TJI，在低EGR率时提升压缩比会造成发动机强烈爆震，过于推迟点火造成燃烧定容度下降，燃油消耗率上升。在高EGR率时，发动机爆震受到抑制，可以提前点火优化燃烧相位，降低燃油消耗率，在压缩比15时最低燃油消耗率相比压缩比11时降低2.2%。高EGR率时，提升压缩比有利于提升燃烧速率，降低滞燃期和燃烧持续期，提升发动机燃烧稳定性。在EGR率为30%而压缩比为15时，逐渐提前点火时刻会加大末端混合气自燃倾向，放热率出现两阶段高峰。
Abstract:The effects of scavenged pre-chamber turbulent jet ignition（TJI） on the performance of an exhaust gas recirculation（EGR） diluted gasoline engine at high compression ratio were studied by using a single-cylinder engine with adjustable compression ratio（CR） and a self-designed turbulent jet ignition system. The results indicate that the combustion stability of the scavenged TJI ignition method was highest at high EGR rate， and stable combustion can be achieved when EGR rate was greater than 30%. Increasing the compression ratio had a positive effect on improving the combustion stability of TJI at high EGR rate. However， it had few effects on the combustion stability of spark ignition（SI）. As for TJI， the strong engine shock will be triggered by increasing the compression ratio at low EGR rate. Besides， the combustion stability will decrease and the fuel consumption will increase due to the overly delayed ignition. At high EGR rate， the engine shock was suppressed， and the combustion phase can be optimized by igniting in advance to reduce the fuel consumption rate. And the lowest fuel consumption rate at compression ratio of 15 was 2.2% lower than that at compression ratio of 11. Moreover， increasing the compression ratio was conducive to improving the combustion rate， reducing the ignition delay time and the burning duration， and promoting the engine combustion stability at high EGR rate. When the EGR rate was 30%， the tendency of autoignition at the terminal mixture will be increased by igniting in advance gradually at compression ratio of 15， and two peaks of the heat release rate will be formed.
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