点火发动机碳氢排放的数值模拟

为了弄清发动机气缸内未燃碳氢uHC的主要生成源和它们在废气排放中所占有的比例 ,有针对性地采取措施降低缸内uHC生成量 ,详细的分析了uHC排放生成机理 ;结合前人的研究成果 ,根据燃烧过程中所体现的物理学知识 ,建立了包括HC逃离正常燃烧、缸内氧化、缸内残留和排气管氧化等在内的一系列模型。通过此模型可非常清楚的了解发动机运行时缸内uHC的具体情况 ,并能定量分析各参数对HC排放的影响

A Simulation for uHC Emissions in Spark Ignition Engines

In order to research the uHC developing mechanisms and its proportions in exhaust gas, thus to take some means to reduce the total engine uHC emissions, the hydrocarbon developing mechanisms are analysed in this paper. A hydrocarbon model is developed according to the theories of uHC and a set of physical laws that addressed in the individual processes which contribute to HC emissions. The model can provide insight into the individual phenomena involved in the total HC formation mechanisms and how each individual process is affected by model inputs.