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    • Optical Diagnostics and Numerical Simulation of Pre-Chamber Jet Flame Development Process under Large Spatial Scales
    DOI：10.13949/j.cnki.nrjgc.2024.02.004
    Key Words:constant volume combustion bomb（CVCB）  low-speed marine engine  dual fuel  optical diagnostics  numerical simulation
    Author NameAffiliationE-mail
    YE Ying* National Engineering Research Center of Special Equipment and Power System for Ship and Marine Engineering， Shanghai 201111， China
    Shanghai Marine Diesel Engine Research Institute， Shanghai 201111， China     		ye_ying_620@163.com 
    MING Zhenyang State Key Laboratory of Engines， Tianjin University， Tianjin 300350， China 2019201306@tju.edu.cn 
    WANG Changqing Shanghai Marine Diesel Engine Research Institute， Shanghai 201111， China  
    WEN Mingsheng State Key Laboratory of Engines， Tianjin University， Tianjin 300350， China mingshengwen@tju.edu.cn 
    LIU Haifeng State Key Laboratory of Engines， Tianjin University， Tianjin 300350， China haifengliu@tju.edu.cn 
    YAO Mingfa State Key Laboratory of Engines， Tianjin University， Tianjin 300350， China y_mingfa@tju.edu.cn 
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    Abstract:Based on a constant volume combustion bomb（CVCB）， the jet flame development process in the main combustion chamber were optically researched under similar spatial and thermodynamic conditions as a low-speed pre-chamber dual-fuel marine engine. A method based on the full-mesh mapping of different combustion models was proposed to simulate the flame development with two combustion stages. The process of flame development was simulated based on the mapping method. The applicability and accuracy of the model for combustion flame speed prediction were verified based on the experimental data of the test device. The research results show that the amount of fuel injection in the pre-chamber directly affects the maximum penetration distance of the jet flame and the flame intensity. The mixture in the main combustion chamber needs to be rich enough to be ignited. For the simulation of the combustion process， the well-stirred reactor（WSR） model was used for the first stage combustion simulation with the jet development speed and the maximum penetration distance. The G equation was used in the second stage combustion to accurately simulate the flame speed in all directions. The two models connected by the mapping method have high prediction accuracies for the overall speed of flame expansion in the two stages of combustion.
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