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    • Experimental Study on Lean Combustion of Pre-Chamber Turbulent Jet Ignition Gasoline Direct Injection Engine
    DOI：10.13949/j.cnki.nrjgc.2025.02.006
    Key Words:pre-chamber  turbulent jet ignition  high-energy ignition  leancombustion  thermal efficiency
    Author NameAffiliationE-mail
    ZHAO Xiaowei College of Mechanical Engineering， University of Shanghai for Science and Technology， Shanghai 200093， China zhaoxw07@163.com 
    SUN Yuedong* College of Mechanical Engineering， University of Shanghai for Science and Technology， Shanghai 200093， China syd@usst.edu.cn 
    ZHANG Zhendong College of Mechanical Engineering， University of Shanghai for Science and Technology， Shanghai 200093， China usstzzd@usst.edu.cn 
    YIN Congbo College of Mechanical Engineering， University of Shanghai for Science and Technology， Shanghai 200093， China yincongbo@usst.edu.cn 
    QIN Wenjin College of Mechanical Engineering， University of Shanghai for Science and Technology， Shanghai 200093， China qinwenjin@usst.edu.cn 
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    Abstract:Based on high-compression-ratio four-cylinder turbo-charged gasoline-direct-injection（GDI） engine and pre-chamber turbulent jet ignition（TJI） system， experimental study of lean combustion characteristics under low and medium loads was carried out. The results show that the combustion stability of TJI has obvious load boundary. Under light load of indicated mean effective pressure（IMEP） 0.4 MPa the cylinder pressure and peak transient heat release rate of TJI decrease significantly and the ignition delay is long compared with conventional spark ignition（SI）. The coefficient of variation（COV） is deteriorated to 5% at IMEP 0.7 MPa. The combustion boundary and indicated fuel consumption and emission of TJI is close to SI at IMEP 1.1 MPa. With increasing of load during light and medium load， the ignition delay is shortened， 50% mass fraction burn crank angle（CA50） is moving forward， the combustion stability is improved， and emissions of total hydrocarbon（THC） and CO are reduced. For TJI application， high-energy ignition is benefit for shortening the ignition delay period， accelerating combustion process， and improving the combustion stability and emission performance.
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