EGR对氢气/柴油双燃料发动机燃烧与排放的影响  

Effects of EGR on Combustion and Emissions in Hydrogen/Diesel Dual-Fuel Engines

作　　者：刘少华[1] 刘晓乐 申立中[1] 毕玉华[1] LIU Shaohua;LIU Xiaole;SHEN Lizhong;BI Yuhua(Faculty of Transportation Engineering,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]昆明理工大学交通工程学院,云南昆明650500

出　　处：《昆明理工大学学报(自然科学版)》2025年第1期106-115,共10页Journal of Kunming University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(52066008);云南省教育厅科学研究基金项目(2021J0057).

摘　　要：为揭示废气再循环(EGR)对氢气/柴油双燃料发动机燃烧及排放特性的影响,开展了不同氢气替代率和EGR率下发动机燃烧和排放特性的数值模拟研究.研究结果表明:双燃料发动机缸压及放热率峰值随EGR率的增加而减小,其峰值对应相位推迟;随氢气替代率增加缸压峰值和缸内平均温度峰值的最大升高幅度分别为7.3%和5.3%,随EGR率增加上述两参数最大降低幅度分别为2.7%和2.1%.随EGR率增加,氮氧化物(NO_(X))排放降低,碳氢化合物(HC)和CO排放增加,当氢气替代率为0、20%、35%时,随EGR率增大,HC最大升高幅度分别为62.9%、53.2%、52.8%,CO最大升高幅度分别为60.1%、54.3%、51.3%,随氢气替代率增大使引入EGR对HC和CO排放的最大升高幅度减小.在35%氢气替代率和15%EGR率下,NO_(X)、HC、CO排放均降低,降低幅度分别为23.8%、5.7%、10.1%.To reveal the impact of Exhaust Gas Recirculation(EGR)on the combustion and emission characteristics of hydrogen/diesel dual fuel engines,numerical simulation studies were conducted on the combustion and emission characteristics of engines under different hydrogen substitution rates and EGR rates.The research results indicate that the peak values of cylinder pressure and heat release rate in dual fuel engines decrease with the increase of EGR rate,and their corresponding phases are delayed;As the hydrogen substitution rate increases,the maximum increases in peak cylinder pressure and average temperature peak in the cylinder are 7.3%and 5.3%,respectively.As the EGR rate increases,the maximum decreases in these two parameters are 2.7%and 2.1%,respectively.As the EGR rate increases,NO_(X) emissions decrease and HC and CO emissions increase.When the hydrogen substitution rate is 0,20%,and 35%,the maximum increase in HC and CO emissions are 62.9%,53.2%,and 52.8%,respectively,as the EGR rate increases.The maximum increase in CO emissions is 60.1%,54.3%,and 51.3%,respectively.As the hydrogen substitution rate increases,the maximum increase in HC and CO emissions introduced into EGR decreases.Under 35%hydrogen substitution rate and a 15%EGR rate,NO_(X),HC,and CO emissions were all reduced by 23.8%,5.7%,and 10.1%,respectively.

关 键 词：双燃料发动机 废气再循环 燃烧特性 排放特性 

分 类 号：TK40[动力工程及工程热物理—动力机械及工程]