不同掺氢比对PRF燃料预混层流燃烧的影响  

Effect of Different Hydrogen Content on Premixed Laminar Combustion of PRF fuel

作　　者：戴湘柱 李岳林[1] 毛德智[1] 王重阳[1] DAI Xiang-zhu LI Yue-lin MAO De-zhi WANG Chong-yang(School of Automobile and Mechanical Engineering, Changsha University of Science and Technology, Changsha 410076, China)

机构地区：[1]长沙理工大学汽车与机械工程学院,长沙410076

出　　处：《车辆与动力技术》2017年第1期1-5,20,共6页Vehicle & Power Technology

基　　金：湖南省自然科学基金项目(2016JJ2003);国家自然科学基金项目(No5117 6014)

摘　　要：为了对掺氢汽油机缸内预混湍流燃烧过程进行更深入的研究,通过反应系数变异分析,优化了掺氢PRF燃料燃烧的化学反应动力学简化机理,采用CHEMKIN软件的Premixed模块,建立并验证了掺氢PRF燃料的预混层流燃烧模型,并在此基础上研究了掺氢对PRF燃料预混层流燃烧过程的影响.研究结果表明,掺氢促进了庚烷与异辛烷的脱氧反应及自由基H、OH的链锁反应,加快了相同初始压力温度以及化学当量比条件下PRF燃料的层流燃烧速度;此外,掺氢增加了NO的排放,但可以有效减小CO_2的排放.In order to further research on premixed turbulent combustion in the cylinder of hydrogen doped gasoline engine, the hydrogen PRF fuel combustion chemical kinetics mechanism was simplified and optimized through the analysis of the reaction coefficient, and the hydrogen PRF fuel premixed laminar combustion model was established and verified by CHEMKIN software Premixed module. On this basis, the hydrogen addition＇s effect on PRF fuel premixed laminar combustion was studied. Research results show that hydrogen promotes the deoxidation reaction of heptane and isooctane as well as the chain reaction of free radical H, OH, and speeds up the laminar burning velocity of PRF fuel under the condition of the same initial pressure, temperature and stoichiometric ratio. In addition, the hydrogen addition increases the emissions of NO, but can effectively reduce the emissions of CO2.

关 键 词：预混层流 PRF燃料 反应系数变异优化 自由基 

分 类 号：TK411.5[动力工程及工程热物理—动力机械及工程]