摘要
在Ricardo Hydra单缸四冲程发动机上利用内部废气再循环策略实现了4种醇类燃料(纯甲醇燃料、纯乙醇燃料、体积分数为50％的甲醇与汽油混合燃料和体积分数为50％的乙醇与汽油混合燃料)的HCCI燃烧．通过调整HCCI发动机的空燃比、转速和气门相位角,研究了醇类燃料HCCI发动机的燃烧特性．结果表明,醇类燃料的 HCCI燃烧不同于普通汽油,燃烧可以在较稀的混合气浓度范围区域内实现,使发动机的运行范围向小负荷和高转速方向拓展,其中纯乙醇可以向高低负荷两个方向拓展运行范围．醇类的着火时刻受化学反应特性和加热的共同影响,其中甲醇燃料的着火在所比较的范围内都是最早的,而且甲醇燃料的着火持续期短于乙醇燃料．除了纯甲醇以外,其他醇类燃料的平均指示压力都高于汽油．
Experiments on the combustion characteristics of alcohol fuels were carried out on a Ricardo Hydra four stroke single cylinder engine and HCCI combustion was achieved through internal exhaust gas recirculation. The fuels tested included methanol （M100）, ethanol （E100）, gasoline mixed with 50% methanol by volume （M50） and gasoline mixed with 50% ethanol by volume （E50）. The effect of λ, engine speeds and valve timings on the combustion characteristics of the four types of fuels was investigated. Results show that different from gasoline, alcohol fuels can achieve HCCI combustion when the charge mixture is lean, and can extend the operating range of the engine to lower loads and higher speeds. E100 for example, is able to extend the range to both higher and lower loads. The ignition timing of alcohols is jointly influenced by the heating effect of the residual gas and chemical kinetics. Methanol fuels are found to have earlier ignition and shorter combustion durations than ethanol fuels. All the fuels tested have higher IMEP （ indicated mean effective pressure） than gasoline, with the exception of M100.
出处
《燃烧科学与技术》
EI
CAS
CSCD
北大核心
2006年第1期5-10,共6页
Journal of Combustion Science and Technology
基金
国家重点基础研究发展规划(973)资助项目(2001CB209204)
关键词
燃烧
均质充量压缩着火
甲醇
乙醇
combustion
homogeneous charge compression ignition
methane1
alcohol
