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    • Investigation on the Combustion Characteristics and Pre-Chamber Injection Strategy of the Methanol Engine by Turbulent Jet Ignition
    DOI：10.13949/j.cnki.nrjgc.2023.01.009
    Key Words:turbulent jet ignition（TJI）  methanol engine  pre-chamber  combustion characteristic
    Author NameAffiliationE-mail
    GONG Shihua* Beijing Foton Cummins Engine Company， Beijing 102206， China shihua.gong@cummins.com 
    CHE Shengnan State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China  
    LIU Zongkuan State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China  
    GONG Yingli Beijing Foton Cummins Engine Company， Beijing 102206， China  
    ZHOU Lei State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China  
    WEI Haiqiao* State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China whq@tju.edu.cn 
    LIU Changwen State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China  
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    Abstract:The engine performances and combustion characteristics of a turbulent jet ignition（TJI） methanol engine were investigated based on a four-stroke single-cylinder engine. The results show that， the heat release rate （HRR） of TJI combustion mode shows the “double-peak” phenomenon， and the HRR peak is higher than that of spark ignition（SI） mode. Meanwhile， the combustion duration of TJI combustion mode is shorter. When the excess air coefficient λ is 1.0， the TJI combustion mode with passive pre-chamber that the methanol was fueled in the pre-chamber has a lower indicated mean effective pressure（IMEP） in comparison to SI mode， and the indicated specific fuel consumption （ISFC） of TJI combustion mode with passive pre-chamber is slightly higher than that of SI mode. For the TJI combustion mode with active pre-chamber， when the excess air coefficient λ is 1.5， the TJI methanol engine has a superior combustion stability when injection timing of pre-chamber methanol is -180° in crank angle and the injection pulse width is 350 μs~600 μs. Meanwhile， both the power performance and fuel economy are improved.
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