吴坚,陈嘉雯,杜家坤,等.主动预燃室式直喷汽油机稀薄燃烧性能研究[J].内燃机工程,2021,42(3):55-60.
主动预燃室式直喷汽油机稀薄燃烧性能研究
The Lean Combustion and Emission Performance of a GasolineDirect Injection Engine with Active Pre-chamber
DOI：10.13949/j.cnki.nrjgc.2021.03.008
关键词:稀薄燃烧  主动预燃室  射流点火  性能  排放  
Key Words:lean burn  pre-chamber  jet flame ignition  gasoline performance  gasoline emission
基金项目:国家重点研发计划项目（2017YFB0103300）
作者单位E-mail
吴坚 广州汽车集团股份有限公司汽车工程研究院 j.wu@gacrnd.com 
陈嘉雯 广州汽车集团股份有限公司汽车工程研究院  
杜家坤* 广州汽车集团股份有限公司汽车工程研究院 dujiakun@gacrnd.com 
陈泓 广州汽车集团股份有限公司汽车工程研究院  
李钰怀 广州汽车集团股份有限公司汽车工程研究院  
占文锋 广州汽车集团股份有限公司汽车工程研究院  
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摘要:为明晰不同点火方式对汽油机稀薄燃烧性能的影响规律，在一款排量为0.5L的研究型单缸机上试验研究了传统火花塞和主动预燃室两种不同点火方式下发动机燃烧及排放特性，探索主动预燃室拓展稀薄燃烧极限的多种影响因素。研究结果表明，稀薄燃烧可有效降低油耗，提高发动机热效率。传统点火线圈的稀燃极限处于过量空气系数1.5附近，最高指示热效率为45%，而采用主动预燃室系统后，稀燃极限可进一步拓展，过量空气系数可达2.0，指示热效率提升至46.5%，氮氧化物排放比传统火花塞点火技术降低约88%；主动预燃室匹配高压缩比14.8:1的燃烧系统，可进一步拓展稀燃极限至过量空气系数2.1，指示热效率可达48%，氮氧化物排放继续降低，在过量空气系数2.1时排气中体积含量最低可达58×10-6。
Abstract:In order to clarify the effect of ignition system on lean burn characteristics, experiment have been done with conventional spark plug ignition and active pre-chamber on a 0.5L Single Cylinder Research Engine (SCRE). The ways how to extend the lean burn limitation also have been investigated. The results show that, lean burn combustion can effectively reduce the fuel consumption and increase the thermal efficiency of gasoline engine. Adopting traditional spark plug system can extend the lean burn limit to excess air ratio of 1.5 with the gross indicated thermal efficiency of 45% limited by unstable combustion, while resembling active pre-chamber system can achieve GITE of 46.5% with the excess air ratio of 2.0 with the help of much more stable combustion. And the NOx emission of active-prechamber system has been reduced by 88% compared by conventional spark plug system. Increasing the compression ratio to 15 can further increase the GITE to 48% and reduce the NOx emission to lowest 58×10-6 (v/v) with the excess air ratio of 2.1.
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