水/蒸汽喷射时刻对汽油机燃烧和排放影响研究  

Research on the Influence of Water/Steam Injection Timing on Gasoline Engine Combustion and Emission

作　　者：贾智圆 孙秀秀 陈勇[1] 李双清 JIA Zhi-yuan;SUN Xiu-xiu;CHEN Yong;LI Shuang-qing(Tianjin Key Laboratory of Power Transmission and Safety Technology for New Energy Vehicles,Hebei University of Technology,Tianjin 300132,China;Ningbo Geely Luoyou Engine Parts Co.,Ltd.,Zhejiang Ningbo 315000,China)

机构地区：[1]河北工业大学,天津市新能源汽车动力传动与安全技术重点实验室,天津300132 [2]宁波吉利罗佑发动机零部件有限公司,浙江宁波315000

出　　处：《机械设计与制造》2024年第8期298-302,共5页Machinery Design & Manufacture

基　　金：宁波市重大科技专项项目(2019B10111);河北省高等学校科学技术研究项目(BJ2021018);天津大学内燃机燃烧学国家重点实验室开放课题(K2021-14)。

摘　　要：通过由试验验证的型号为LJ465Q汽油发动机热力学模型,研究了缸内水和蒸汽喷射时刻对发动机性能和排放的影响规律。结果表明,在发动机2000r/min及全负荷下,喷射质量为9mg,喷射压力为10bar,喷射时刻为(-110~-60)°CA时,水喷射工况输出功率随着喷射时刻滞后逐渐减小,功率最大可提高0.71%,燃油消耗率可降低0.74%,喷水后减少了局部高温和局部过浓区域,有助于明显降低NOx排放,其最大降低了66.3%,HC排放有所增加;过热蒸汽喷射工况输出功率随着喷射时刻滞后逐渐增大,功率最大可提高1.7%,燃油消耗率可降低1.8%,NOx排放量随喷射时刻增大而减少,最大降低了55.2%,HC排放降低了15.4%。综上,缸内蒸汽喷射相比于水对发动机性能和排放的影响效果具有一定优势。The thermodynamic model of the LJ465Q gasoline engine verified by experiments is used to study the influence of in-cylinder water and steam injection timing on engine performance and emissions.The results show that when the engine is 2000r/min and full load,the injection mass is 9mg,the injection pressure is 10bar,the injection time is(-110~-60)℃A,the output power under water injection conditions gradually decreases with the lag of the injection time,the power can be increased by 0.71%and the fuel consumption rate can be reduced by 0.74%.After water injection,the local high temperature and local over-rich area are reduced,which helps to significantly reduce NOx emission,which is reduced by 66.3%at most,and HC emission are increased.The output power of superheated steam injection increased gradually with the lag of injection time,and the power increased by 1.7%at most,and the fuel consumption rate decreased by 1.8%.NOx emission decrease with the increase of the injection time,which decreased by 55.2%and HC emission decreased by 15.4%.In summary,in-cylinder steam injection has certain advantages compared to the effect of water on engine performance and emissions.

关 键 词：汽油机 缸内喷水 缸内蒸汽喷射 喷射时刻 模拟研究 

分 类 号：TH16[机械工程—机械制造及自动化]