面向缸内直喷汽油机燃烧调控的若干基础问题研究

内燃机高效清洁燃烧是提高能源利用率和降低排放的重要途径，缸内直喷汽油机是实现高效清洁内燃机的有效途径。本项目采用定容燃烧装置，开展喷雾与燃烧的耦合性研究，将喷雾作为混合气形成和燃烧的调控手段，研究喷雾形态对充量形态的调控规律、对火核形成和火焰传播的作用规律以及稀燃能力拓展。通过基础层面的研究阐明各参数的影响规律、多参数间的耦合作用规律，定量阐明喷射、流动、分层下的燃烧规律，为高效低污染发动机燃烧调控提供基础数据、方案优化和技术路径。在燃烧基础层面形成系统性的规律认识，为发动机燃烧现象的解析和燃烧调控提供支撑。

High efficient and clean combustion is key route to increase energy utilization efficiency and decrease emissions of engines, while direct injection gasoline engine is an effective approach to realize this task. This project will study the coupling effect between spray and combustion by using the constant volume facility. Spray is adopted as the regulating method for mixture formation and combustion. The effects of spray modes and patterns on charge formation, flame nuclei formation and propagation as well as lean capability will be studied. The fundamental research can clarify the influence law for each individual parameter and the coupling law from multi-parameters, and quantitatively characterize the combustion processes from spray, flow and stratification. The research can provide the database, optimization and technological route for engine combustion regulation. The research can make systematic understanding in fundamental aspect of combustion, and assist the clarification of engine combustion and regulation.