稀燃模式下直喷氢气发动机性能试验  

Performance experiment of direct injection hydrogen engine under lean combustion mode

作　　者：王雷[1] 李海玉[2] 栾阔 赵妞 陈广源 Wang Lei;Li Haiyu;Luan Kuo;Zhao Niu;Chen Guangyuan(School of Automotive Engineering,Weifang Vocational College,Weifang,262737,China;School of Mechanical and Electrical Engineering,Weifang Vocational College,Weifang,262737,China;School of Mechanical Engineering,Wanjiang University of Technology,Ma'anshan,243031,China;Electric Control Technology Research Institute,Shengrui Transmission Co.,Ltd.,Weifang,261000,China)

机构地区：[1]潍坊职业学院汽车工程学院,山东潍坊262737 [2]潍坊职业学院机电工程学院,山东潍坊262737 [3]皖江工学院机械工程学院,安徽马鞍山243031 [4]盛瑞传动股份有限公司电控技术研究院,山东潍坊261000

出　　处：《中国农机化学报》2024年第11期125-130,共6页Journal of Chinese Agricultural Mechanization

基　　金：安徽省高校自然科学研究重点项目(KJ2021A1210,2022AH052431);潍坊市科学技术发展计划项目(2021GX024)。

摘　　要：为研究氢气直喷发动机在稀薄燃烧下的燃油经济性、环保性和动力性,进行不同混合气浓度和不同负荷下的氢气直喷发动机燃烧特性研究。结果显示稀薄燃烧可以降低燃烧率和缸内压力升高率,并通过提高工质多变系数降低传热损失,从而显著提高热效率。混合气变稀对火焰传播的影响较大,负荷对燃烧持续期的影响较小。过量空气系数λ在1.1~1.6范围时,NO_(X)排放最高,但加浓和稀释混合气均可降低排放。负荷增加也会显著增加NO_(X)排放。在小负荷下(平均有效制动压力BMEP=0.2 MPa),当λ>1.8时,NO_(X)排放低于10-5;而在负荷较大(BMEP=1.2 MPa)时,即使λ=2.0,NO_(X)排放仍超过0.002。In order to investigate the fuel economy,environmental impact and power performance of hydrogen direct injection engine under lean combustion,a study on the combustion characteristics of hydrogen direct injection engines under different mixture concentration and different load was conducted.The results revealed that lean combustion could reduce the combustion rate and the rate of cylinder pressure rise,while improving thermal efficiency by reducing heat transfer losses through an increased working fluid specific heat ratio.The influence of mixture dilution on flame propagation was significant,whereas the impact of load on combustion duration was relatively minor.The highest NO_(X) emissions were observed within the excess air ratioλrange of 1.1-1.6,but both mixture enrichment and dilution were effective in reducing emissions.Increasing the load also resulted in a significant increase in NO_(X) emissions.At low loads(the mean effective brake pressure(BMEP)is 0.2 MPa),NO_(X) emissions remained below 10-5 whenλexceeded 1.8.However,at higher loads(BMEP=1.2 MPa),even atλ=2.0,NO_(X) emissions still exceeded 0.002.

关 键 词：氢气直喷发动机 稀薄燃烧 燃烧特性 混合气稀释 NO_(X)排放 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]