基于多区模型氢气对均质压燃甲烷发动机点火正时和排放影响

通过使用CHEMKIN多区模型研究添加氢气对甲烷燃烧的影响．结果显示添加氢气提前点火正时并且提高最高压力和最高温度．同时，用简易的化学反应动力学分析它的适用范围．结果表明羟基在燃料的氧化中起重要作用．添加氢气增加氮氧化物的排放，但会降低碳氢和一氧化碳的排放．废弃再循环也会提前点火正时，但是它对排放的影响相反．通过调节添加氢气与废弃再循环的量，点火正时可以在低排放的条件下进行调节．研究发现氮氧化物主要产生在核心区，而碳氢和一氧化碳主要产生在缝隙区和边界层区．

Effect of Hydrogen Addition on Methane HCCI Engine Ignition Timing and Emissions Using a Multi-zone Model

Ignition timing control is of great importance in homogeneous charge compression ignition engines. The effect of hydrogen addition on methane combustion was investigated using a CHEMKIN multi-zone model. Results show that hydrogen addition advances ignition tim- ing and enhances peak pressure and temperature. A brief analysis of chemical kinetics of methane blending hydrogen is also performed in order to investigate the scope of its appli- cation, and the analysis suggests that OH radical plays an important role in the oxidation. Hydrogen addition increases NOx while decreasing HC and CO emissions. Exhaust gas recir- culation （EGR） also advances ignition timing; however, its effects on emissions are generally the opposite. By adjusting the hydrogen addition and EGR rate, the ignition timing can be regulated with a low emission level. Investigation into zones suggests that NOx is mostly formed in core zones while HC and CO mostly originate in the crevice and the quench layer.