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    • 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
    Key Words:turbulent jet ignition  exhaust gas recirculation（EGR）  combustion stability  compression ratio
    Author NameAffiliationE-mail
    DING Yixiong* State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China dingyixiong1@163.com 
    SONG Yuntong State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China  
    LIU Zongkuan State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China  
    LIAO Shengyou Yuchai Machinery Company， Yulin 537000， China  
    ZHOU Lei* State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China lei.zhou@tju.edu.cn 
    WEI Haiqiao State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China  
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    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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