摘要
本文利用数值模拟研究了无对流条件下异辛烷单液滴多段自着火模式,并对其动态着火过程进行分析。首先通过零维反应器数值仿真得到异辛烷纯气相反应在低温和高温路径下均存在两段热释放,即四级着火。然后在初始温度600~1000 K、初始压力0.05~2 MPa、空气环境中对异辛烷孤立液滴自着火模式进行数值模拟,得到上述工况下异辛烷液滴自着火模式包括无着火、一级冷火焰着火、二级着火,并对异辛烷单液滴二级着火的动态着火过程中液滴周围发生的不同温度路径下反应进行深入分析,最后讨论加入EGR气体对异辛烷单液滴自着火的抑制作用。
This study uses numerical simulations to investigate the multi-stage auto-ignition patterns of iso-octane single droplet under non-convective condition and analyse its dynamic ignition process.Firstly,we obtained that the pure gas phase reaction of iso-octane has two-stage heat release under both low and high temperature paths,i.e.,four-stage ignition,by numerical simulation of a 0-D reactor.Then,we numerically simulated iso-octane single droplet auto-ignition patterns in the initial temperature of 600∼1000 K,initial pressure of 0.05∼2 MPa in air environment,and obtained that the patterns under the above conditions include no ignition,single stage cool flame,and two-stage ignition.Then we discussed the dynamic ignition process of two-stage ignition with the reactions occurring around the droplet under different temperature paths in detail.Finally,the inhibitory effect of adding EGR gas on auto-ignition of iso-octane single droplet was discussed.
作者
宋海玉
张文艺
周恒毅
梁文恺
刘有晟
SONG Haiyu;ZHANG Wenyi;ZHOU Hengyi;LIANG Wenkai;LIU Yucheng(Center for Combustion Energy,Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China;Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Tsinghua University,Beijing 100084,China)
出处
《工程热物理学报》
北大核心
2025年第10期3427-3439,共13页
Journal of Engineering Thermophysics
基金
国家重点研发计划(No.2021YFA0716201)。
关键词
异辛烷
微重力
数值模拟
多段自着火
EGR
iso-octane
microgravity
numerical simulation
multi-stage auto-ignition
EGR
