摘要
为研究高浓度CO_(2)在高温高压情况下对柴油燃烧特性的影响,提出了柴油表征燃料在CO_(2)/O_(2)氛围下的燃烧反应机理.通过量子化学计算了化学反应路径并对反应路径进行分析,最后进行柴油表征燃料燃烧的仿真.通过搭建定容燃烧弹试验台架和可视化系统进行试验与仿真分析,结果表明:在50%CO_(2)+50%O_(2)氛围下,对仿真与实验的火焰燃烧极限长度和火焰纵截面面积进行对比,最小误差分别为0.39%和0.64%,最大误差分别为8.54%和4.94%,说明此机理适用于高浓度CO_(2)氛围下柴油燃烧特性的研究;CO_(2)的化学效应在柴油表征燃料燃烧时具有促进作用,CO_(2)在2600 K时发生热解,热解产物CO与H自由基等发生反应可以生成着火促进剂·OH;柴油在50%CO_(2)+50%O_(2)、43%CO_(2)+57%O_(2)和35%CO_(2)+65%O_(2)氛围下的燃烧效率比空气氛围分别提高了28.2%、30.4%和33.3%.
In order to study the effect of high concentration of CO_(2) on the combustion characteristics of diesel under high temperature and high pressure,a combustion reaction mechanism of diesel fuel under CO_(2)/O_(2) atmosphere is proposed.The chemical reaction paths are calculated and analyzed by quantum chemistry,and simulation of diesel fuel combustion is performed.Finally,a constant volume combustion test chamber is built and visualized.The experimental and simulation results show that in 50%CO_(2) and 50%O_(2) atmosphere,the minimum errors between the simulation and experimental results for the flame combustion maximum length and area of the flame longitudinal section are 0.39%and 0.64%,and maximum errors are 8.54%and 4.94%,respectively.It indicates that the proposed mechanism is suitable for the study of diesel combustion characteristics in a high⁃concentration CO_(2) atmosphere.The chemical effect of CO_(2) can promote the combustion of diesel fuel.CO_(2) will undergo pyrolysis at 2600 K.The pyrolysis product CO can react with H free radicals to generate ignition promoter·OH.The combustion efficiency of diesel under 50%CO_(2)+50%O_(2),43%CO_(2)+57%O_(2) and 35%CO_(2)+65%O_(2) atmosphere is 28.2%,30.4%and 33.3%higher than that of air atmosphere,respectively.
作者
王龙
刘永峰
毕贵军
刘海峰
宋金瓯
何旭
WANG Long;LIU Yongfeng;BI Guijun;LIU Haifeng;SONG Jin′ou;HE Xu(School of Mechanical-Electronic and Vehicle Engineering,Beijing University of Civil Engineering and Architecture,Beijing 102616;Agency for Science,Technology and Research,A∗STAR,Singapore 637662;State Key Laboratory of Engines,Tianjin University,Tianjin 300072;School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081)
出处
《环境科学学报》
CAS
CSCD
北大核心
2021年第11期4477-4488,共12页
Acta Scientiae Circumstantiae
基金
北京市自然科学基金(No.3192011)
国家自然科学基金(No.51976007)
北京建筑大学研究生创新项目(No.PG2021091)。
关键词
高浓度CO_(2)
表征燃料
量子化学计算
定容燃烧弹
燃烧效率
high⁃concentration CO_(2)
surrogate fuel
quantum chemical
constant volume combustion chamber
combustion efficiency
