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    • Numerical Analysis of the Stoichiometric-Combustion Characteristics of A Gasoline Engine with A Passive Pre-Chamber
    DOI：10.13949/j.cnki.nrjgc.2022.06.003
    Key Words:gasoline engine  passive pre-chamber  combustion characteristic  numerical simulation
    Author NameAffiliationE-mail
    ZHOU Hao* School of Automotive Studies， Tongji University， Shanghai 201804， China 2033553@tongji.edu.cn 
    HAN Zhiyu* School of Automotive Studies， Tongji University， Shanghai 201804， China hanzhiyu@tongji.edu.cn 
    WU Zhenkuo School of Automotive Studies， Tongji University， Shanghai 201804， China  
    MENG Shuo School of Automotive Studies， Tongji University， Shanghai 201804， China  
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    Abstract:The three-dimensional numerical simulation analysis of the combustion process was carried out in a turbocharged direct-injection gasoline engine with a passive pre-chamber. The effects of different design parameters of the pre-chamber， such as the volume of the pre-chamber， the number of the jet orifices， the diameter of the jet orifices， and the structure of the jet orifices， on the stoichiometric-combustion characteristics were studied. The results show that the main reason why jet ignition of the pre-chamber is superior to the conventional spark ignition is that the number of ignition spots in the main combustion chamber is increased， and the high-speed jet generated from the pre-chamber after ignition will enhance the turbulence intensity in the main combustion chamber， thereby accelerating the propagation of the turbulent flame. Under the engine operation condition of 2 000 r/min and 1.2 MPa indicated mean effective pressure（IMEP）， the 50% fuel-burnt angle of the pre-chamber engine is about 8.5° ahead that of the spark ignition engine. From the simulations of different pre-chamber structural parameters， it is found that the stronger the momentum of the jet injected from the pre-chamber into the main combustion chamber at the initial stage of combustion， the greater the enhancement effect on the turbulence intensity in the main combustion chamber and the better the combustion phases. The 50% fuel-burnt angles among various structured pre-chamber cases differ up to nearly 5.8° under the engine operation conditions mentioned above. The differences in combustion phases caused by the varied pre-combustion chamber structures are mainly reflected in the early and middle combustion stages， and these differences tend to decrease as the engine speed and load increase.
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