摘要
基于甲烷气相反应化学动力学机理,耦合甲烷在铂(Pt)表面催化反应机理对微型自由活塞式动力装置带有催化燃烧的均质充量压缩燃烧(HCCI)过程进行数值模拟研究,实现了自由活塞运动与燃烧过程耦合的计算方法.在此基础上对微燃烧室底部添加催化剂的模型与未添加催化剂的模型模拟结果进行了对比.根据H2O2质量分数变化曲线定义了微自由活塞动力装置开始着火时段.通过数值模拟发现,催化燃烧可以使着火时刻提前,压缩比减小,滞燃期缩短,燃料燃烧产生能量的使用效率提高,拓宽微自由活塞压缩均质混合气着火界限;而且得到了催化作用对微燃烧室内温度、压力等因素的影响情况.结果表明:催化作用可以降低微燃烧室内最高燃烧压力及最大压力升高率,从而降低微自由活塞动力装置运行粗暴性,使工作过程平稳.
Based on the kinetics mechanism of methane gas phase reaction and coupled catalytic reaction mechanism of methane in Pt surface,the homogeneous charge compression ignition(HCCI)process with catalysis of micro freepiston power device was studied,and the calculation method that coupled free-piston motion and combustion process was realized. Comparison of the simulation result between with and without catalysis model was made. According to mass fraction of H2O2,fire start timing of micro free-piston power device was defined. Simulation results show that catalysis advances the ignition timing,decreases the compression ratio,shortens the ignition delay,increases the energy conversion efficiency of fuel combustion,and broadens the ignitability limit of mixture in micro power device.Moreover,the influence of temperature,pressure and other factors with catalysis was obtained. Simulation results show that catalytic action can reduce the peak combustion pressure and peak rate of pressure rise,making the stable operation of micro free-piston power device.
出处
《内燃机学报》
EI
CAS
CSCD
北大核心
2015年第2期186-191,共6页
Transactions of Csice
基金
国家自然科学基金资助项目(51476071)
江苏高校优势学科建设工程资助项目(苏教材[2011]8号)
关键词
微型燃烧室
自由活塞
均质充量压缩燃烧
催化燃烧
micro combustor
free-piston
homogeneous charge compression ignition
catalytic combustion
