高速直喷柴油燃烧系统潜在的碳烟和一氧化碳减排方法

The current direction for Diesel combustion system development is towards homogenization, in order to reduce particulate and NOx emissions. However, a strong increase of carbon monoxide emissions (CO) is frequently noted in combination with enhanced homogenization. Therefore, the current investigation focuses on a detailed analysis of the particulate - CO trade-off using a laser-optical and multidimensional CFD investigation of the combustion process of a swirl HSDI system. The CFD methodology involves reduced kinetics for soot formation and oxidation and a three-step CO model. These models are validated by a detailed comparison to optical measurements of flow, spray penetration and the spatial distribution of soot, temperature and oxygen concentration. The results obtained show that high concentrations of CO occur as an intermediate combustion reaction product. Subsequently, CO and soot are oxidized in large areas of the combustion chamber. In part load operation, CO emissions are mainly caused by dilution effects in the early phases of combustion. However, the engines soot emissions are caused by insufficient oxidization. Soot generation and oxidation are found to be strongly impacted by the slight non-homogeneity of the swirl motion. The gaseous emissions are not affected by the small differences in local flow, which are outlined further in the text. 德国LaVision PIV/PLIF粒子成像测速场仪 PLIF平面激光诱导荧光火焰燃烧检测系统 激光诱导白炽光烟雾粒子成像分析仪(LII)