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    • Numerical Study on Combustion and Emissions of a Spark-Ignition Engine Fueled with Ammonia/Hydrogen Blends
    DOI：10.13949/j.cnki.nrjgc.2024.03.005
    Key Words:ammonia-hydrogen fuel  spark-ignition engine  combustion characteristic  emission
    Author NameAffiliationE-mail
    SHEN Juanya China-UK Low Carbon College， Shanghai Jiao Tong University， Shanghai 200240， China shenjuanya@sjtu.edu.cn 
    HUO Jinlu Key Laboratory for Power Machinery and Engineering of M.O.E.， Shanghai Jiao Tong University， Shanghai 200240， China jlhuojlu@sjtu.edu.cn 
    PAN Genglong Key Laboratory for Power Machinery and Engineering of M.O.E.， Shanghai Jiao Tong University， Shanghai 200240， China pangenglong@sjtu.edu.cn 
    LI Xiangchao Key Laboratory for Power Machinery and Engineering of M.O.E.， Shanghai Jiao Tong University， Shanghai 200240， China shenjuanya@sjtu.edu.cn 
    ZHOU Chao Key Laboratory for Power Machinery and Engineering of M.O.E.， Shanghai Jiao Tong University， Shanghai 200240， China zhouchaoqun@sjtu.edu.cn 
    HAN Dong* China-UK Low Carbon College， Shanghai Jiao Tong University， Shanghai 200240， China
    Key Laboratory for Power Machinery and Engineering of M.O.E.， Shanghai Jiao Tong University， Shanghai 200240， China     		dong_han@sjtu.edu.cn 
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    Abstract:The effects of hydrogen blending ratios and spark ignition timings on the combustion and emissions of a spark-ignition engine fueled with ammonia/hydrogen blends at the stoichiometric condition were investigated. The results show that increasing the hydrogen blending ratio can accelerate flame propagation， shorten the combustion duration， and raise peak in-cylinder pressures and temperatures. Besides， as the hydrogen blending ratio increases， unburned ammonia and N2O emissions decrease， while both the formation of fuel-NO and thermal-NO increase. Properly advancing the ignition timing improves combustion characteristics， balancing the emissions of NO， N2O， and unburned ammonia. With delayed ignition timing， the NO emission decreases， while the N2O and unburned ammonia emissions exhibit an opposite trend. However， increased delay in ignition timing results in the increased emission of unburned ammonia， leading to the incomplete heat release during combustion and the decrease of indicated thermal efficiency.
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