主动预燃室燃料控制参数对汽油机稀燃特性的影响  

Effect of Fuel Control Parameters of the Active Pre-chamber on the Gasoline Engine Lean Burn Characteristics

作　　者：许秉鑫 缪新轲 邓俊[1] 王金秋 李理光[1] Xu Bingxin;Miao Xinke;Deng Jun;Wang Jinqiu;Li Liguang(School of Automotive Studies,Tongji University,Shanghai 200092)

机构地区：[1]同济大学汽车学院,上海200092

出　　处：《汽车工程》2024年第9期1628-1632,共5页Automotive Engineering

基　　金：国家自然科学基金(52076153)资助。

摘　　要：预燃室点火系统可促进稀薄混合气燃烧,从而显著提高热效率。本文基于自行开发的主动预燃室及其燃料供给系统,在压缩比为16的发动机上分别测试了预混气体喷射压力和燃料占比对发动机稀燃边界下燃烧特性的影响。试验结果表明:0.19、0.14和0.09 MPa 3种预混气体喷射压力中,在0.09 MPa的喷射压力下可获得最高的平均指示压力和最短的着火延迟期和燃烧持续期,燃烧最稳定;当预混气体燃料占比从0.54%逐步增加到2.69%时,发动机的平均指示压力先增加后减少,并在占比1.61%处取得最大值,此时的燃烧最为稳定,着火延迟期和燃烧持续期均最短。主动预燃室可实现λ=1.8的稳定燃烧,指示热效率相比普通火花塞点火的32.9%提高到39.4%,相对提升了19.8%。The pre-chamber ignition system can enhance the lean mixture combustion,which will then improve the thermal efficiency significantly.Based on a self-developed active pre-chamber and its fuel supply system,the effect of premixed gas injection pressure and fuel ratio on combustion characteristics at the lean boundary of an engine with a compression ratio of 16 is respectively investigated.The experimental results show that among the three kinds of premixed gas injection pressure of 0.19,0.14 and 0.09 MPa,the indicated mean effective pressure is the highest,and the ignition delay time and combustion duration are the lowest at the injection pressure of 0.09 MPa,with the most stable combustion.When the proportion of premixed gas fuel increases from 0.54%to 2.69%gradually,the engine's indicated mean effective pressure(IMEP)increases first,and then decreases,reaching its maximum at a ratio of 1.61%when the combustion is most stable and both the ignition delay period and combustion duration are the shortest.The active pre-chamber can realize the stable combustion with aλof 1.8.Indicated thermal efficiency increases from 32.9%to 39.4%,a relatively increase of 19.8%compared with that of spark plug ignition.

关 键 词：发动机 主动预燃室 燃料控制参数 稀燃特性 

分 类 号：U464.171[机械工程—车辆工程]