不同海拔条件下柴油燃烧火焰温度和碳烟特性研究  

Flame Temperature and Soot Characteristics of Diesel Combustion at Different Altitudes

作　　者：何旭[1,2] 徐雨轩 许锴 刘泽昌 向祺 张朝 魏巍 HE Xu;XU Yuxuan;XU Kai;LIU Zechang;XIANG Qi;ZHANG Zhao;WEI Wei(School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China;Collaborative Innovation Center of Electric Vehicles in Beijing,Beijing 100081,China;School of Mechanical Engineering,North China University of Water Resources and Electric Power,Zhengzhou,Henan 450045,China)

机构地区：[1]北京理工大学机械与车辆学院,北京100081 [2]北京电动汽车协同创新中心,北京100081 [3]华北水利水电大学机械学院,河南郑州450045

出　　处：《北京理工大学学报》2023年第2期135-142,共8页Transactions of Beijing Institute of Technology

基　　金：国家自然科学基金资助项目(51976012)。

摘　　要：为了研究海拔条件对柴油机冷起动阶段柴油燃烧过程的影响,在定容燃烧弹台架上模拟了平原和海拔2000 m工况下柴油机缸内的热力学状态,利用双色法获取了不同工况下柴油火焰温度和表征碳烟浓度的KL因子分布.结果表明,随着海拔由0 m增加至2000 m,环境温度、压力同时降低产生了耦合作用,导致柴油滞燃期由2.0 ms增大至3.13 ms.海拔升高后,柴油燃烧过程中平均火焰温度降低,局部高温区域消失,KL因子总量减少.海拔条件变化影响了碳烟特性和火焰温度的关系.随着海拔升高,火焰温度降低,导致碳烟氧化主导阶段碳烟氧化速率降低,局部火焰温度对局部碳烟浓度的影响减小.To study the altitude effects on the diesel combustion process under cold-start condition, the thermodynamic state of the diesel engine cylinder was simulated in a constant volume combustion chamber under the plain condition and the 2000 m altitude condition. Flame temperature and KL factor distribution for soot concentration characterizing were obtained by the two-color method under different conditions. Results show that the simultaneous decrease of ambient temperature and pressure can produce a coupling effect, resulting in the diesel ignition delay from 2.0 ms to 3.13 ms increasing, when the altitude increases from 0 m to 2000 m. As the altitude increases, the average flame temperature decreases during the diesel combustion process, while the local high temperature area disappears and the total KL factor decreases. The relationship between soot characteristics and flame temperature is affected evidently with altitude increases. With the increase of altitude and the decrease of flame temperature, the soot oxidation rate decreases in the soot oxidation dominated process and the impact of local flame temperature on local soot concentration weakens.

关 键 词：柴油机 燃烧 双色法 火焰温度 碳烟特性 海拔 

分 类 号：TK421.2[动力工程及工程热物理—动力机械及工程]