摘要
在柴油中掺入10%碳酸二甲酯(10%DMC,简称为D10),进行了D10燃料的燃烧与排放特性的研究。试验结果表明:在特定负荷下,对于3种燃油(D10无喷油调整、D10有喷油调整和柴油)供给状态下,发动机的着火几乎出现在同一时刻;发动机燃用D10时,其瞬时放热率在初始阶段比柴油高,指示热效率明显得到提高;HC和CO排放下降明显,但这两者遵循不同的机理,其中CO在高负荷下对较低的过量空气系数更敏感,而HC则更多地与着火延迟期长短有关;NOx排放因含氧燃料DMC的加入而增加,同时燃料中的氧对PM排放的降低起到了重要作用。PM排放的降幅和NOx排放的升幅为后续调节这两者排放提供了较大空间。
Adding certain dimethyl carbonate （DMC） in diesel fuel, namely 10% of DMC （called D10）, experimental investigation on combustion and emissions of the blend fuel engine was carried out. Results show that at given load,the ignition occurs approximately at same position for either D10 with and without injection adjustment or pure diesel fuel. At initial stage, engine instantaneous heat release rate of D10 is higher than diesel fuel. The indicative thermal efficiency of D10 is increased remarkably. The HC and CO emissions are apparently reduced when burning the blended fuel D10;however,the different mechanisms are followed for the HC and CO reductions,because CO is more sensitive to low excess air coefficient at high load condition, while HC is more related to ignition delay length. The growth of NO4 emissions can be perceivable owing to addition of oxygen-rich fuel DMC,meanwhile the oxygen in the blended fuel D10 plays an important role in reducing PM emissions. The relation between NO4 growth and PM drop provides a large space for compromising NO4 and PM emissions in future study.
出处
《内燃机工程》
EI
CAS
CSCD
北大核心
2013年第5期7-12,共6页
Chinese Internal Combustion Engine Engineering
基金
国家自然科学基金资助项目(51076069)
江苏高校优势学科建设工程资助项目(苏政办发〔2011〕6号)
关键词
内燃机
含氧燃料
碳酸二甲酯
燃烧
排放
IC engine
oxygen-rich fuel
dimethyl carbonate （DMC）
combustion
emission
