高浓度CO2对柴油着火延迟特性的影响  

Effects of High Concentration CO2 on Diesel Ignition Delay Characteristics

作　　者：盛瑜琪 刘永峰 李志军[2] 姚圣卓 梁兴雨[2] 何旭[3] SHENG Yu-qi;LIU Yong-feng;LI Zhi-jun;YAO Sheng-zhuo;LIANG Xing-yu;HE Xu(Beijing Key Laboratory of Performance Guarantee on Urban Rail Transit Vehicles,School of Mechanical-Electronic and Vehicle Engineering,Beijing University of Civil Engineering and Architecure,Beijing 100044,China;State Key Laboratory of Engines,Tianjin University,Tianjin 300072,China;School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京建筑大学机电与车辆工程学院,城市轨道交通车辆服役性能保障北京市重点实验室,北京100044 [2]天津大学内燃机燃烧学国家重点实验室,天津300072 [3]北京理工大学机械与车辆学院,北京100081

出　　处：《科学技术与工程》2020年第36期14929-14934,共6页Science Technology and Engineering

基　　金：国家自然科学基金(51976007);北京市自然科学基金(3192011);北京建筑大学研究生创新项目(PG2020093,PG2020094)。

摘　　要：为了研究柴油在高浓度CO2环境中的着火延迟特性,提出适用于该环境下的着火延迟时间公式。该公式考虑了CO2的热效应和第三体效应对着火延迟的影响,分析了CO2浓度与着火延迟的关系,运用Chemkin模拟了CO2对OH自由基生成速率的影响。对该环境下柴油的着火问题进行了定容燃烧弹的可视化实验研究和仿真计算。结果表明:着火延迟时间公式在CO2物质的量分数小于60%时能够有效表达CO2对着火延迟时间的影响;CO2物质的量分数大于60%时,反应H2O2+M→20H+M中的第三体效率降低导致着火延迟增长变慢。In order to study ignition delay characteristics of diesel in high concentration CO2 environment,an ignition delay time formula was proposed,which considered thermal effect and third body effect of CO2 on ignition delay.The relationship between CO2 concentration and ignition delay was analyzed then.The CO2 effect on OH radicals formation rate was simulated by Chemkin software.The visualized experimental research and simulation of constant-volume combustion bombs were carried out for diesel ignition in this environment.The results show that the ignition delay time formula can effectively describe the CO2 effect on the ignition delay time when the CO2 volume fraction is less than 60%.In reaction H2O2+M→20H+M,the decrease of third body efficiency leads to a slower growth of ignition delay when the CO2 volume fraction is more than 60%.

关 键 词：O2/CO2燃烧 着火延迟 柴油 高浓度CO2 

分 类 号：TK421.24[动力工程及工程热物理—动力机械及工程]