醇类燃料自燃主导反应及其对滞燃期的影响  

The Leading Reaction and Influence on Ignition Delay of Alcohol Fuel in Spontaneous Combustion

作　　者：钟祥麟[1] 张爽[2] ZHONG Xianglin;ZHANG Shuang

机构地区：[1]中国汽车技术研究中心有限公司 [2]吉林大学

出　　处：《汽车工程师》2018年第12期30-35,共6页Automotive Engineer

摘　　要：为从反应机理的角度来研究醇类燃料自燃的主导反应,通过CHEMKIN软件分别对甲醇、乙醇和正丁醇在初始边界条件(热力学温度为800 K,压力为3.86 MPa,当量比为1)下进行反应路径模拟分析,得出醇类燃料燃烧的链式反应关系,确立了醇类燃料的主导反应均为以C-H键断裂为标志的脱氢反应。分别选取热力学温度为800,1 000,1 200 K,调整当量比大小来保证燃料中C-H键数目相等。仿真结果表明:同一温度下,同一种醇类燃料的滞燃期波动基本维持不变;不同燃料的滞燃期有所差异,同一初始压力下,甲醇的滞燃期约为乙醇的2倍、正丁醇的20倍。In order to study the leading reaction of spontaneous combustion of alcohol fuel from the perspective of reaction mechanism,the reaction paths of methanol,ethanol and n-butanol under initial boundary conditions(thermodynamic temperature is800K,the pressure is3.86MPa,and the equivalence ratio is1)were simulated and analyzed by CHEMKIN software.The chain reaction relationship of alcohol fuel combustion was obtained,and it was established that the leading reaction of alcohol fuel was dehydrogenation reaction marked by C-H bond fracture.The thermodynamic temperatures of800,1000,1200K were selected respectively,and the equivalence ratio was adjusted to ensure the equal number of C-H bonds in the fuel.The simulation results show that the ignition delay fluctuation of same alcohol fuel remains basically unchanged at the same temperature.The ignition delay of different fuels is different.Under the same initial pressure,the ignition delay of methanol is about twice that of ethanol and20times that of n-butanol.

关 键 词：醇类燃料 主导反应 分子碰撞能 滞燃期 

分 类 号：U473[机械工程—车辆工程]