摘要
应用三维CFD模型耦合化学动力学模型的方法,研究了进气初始条件对柴油机低温燃烧及多环芳香烃(PAHs)排放特性的影响规律。结果表明:进气温度降低,滞燃期延长,同时由于进气密度增大,使柴油机的循环进气量增多,空燃比升高,燃油在缸内燃烧更充分,在较低的进气温度工况时缸内生成PAHs各组分相对较低;进气压力升高,PAHs各组分的生成时刻提前,并且PAHs各组分的含量依次减少。燃烧起始阶段,苯(C6H6)主要分布在燃烧室凹坑附近。在燃烧中期与后期,其主要分布在凹坑壁面附近。
Based on three-dimensional CFD model coupled with the reduced chemical dynamics model, this paper studies the effects of inlet initial conditions on low temperature combustion pzocess and PAHs emission characteristics of diesel engines. The results indicate that the ignition delay time is longer when intake temperature was reduced, while the air input and air-fuel ratio increase when intake density increasing resulting in lower generation of PAHs component. With the increasing of intake pressure, the generation time of PAHs components was earlier and the content of PAHs components was reduced. Benzene is mainly distributed near the combustion chamber pit in burning combustion stage and mainly distributed near the pit wall in middle and late combustion stage.
作者
王峰
郑朝蕾
肖俊峰
王玮
李晓丰
WANG Feng ZHENG Zhao-lei XIAO Jun-feng WANG Wei LI Xiao-feng(Xi＇an Thermal Power Research Institute Co. , Ltd, Xi＇an 710054, China College of Power Engineering, Chongqing University, Chongqing 400044, China)
出处
《热科学与技术》
CAS
CSCD
北大核心
2017年第4期313-319,共7页
Journal of Thermal Science and Technology
关键词
柴油机
化学动力学模型
低温燃烧
排放特性
diesel engines
chemical dynamics model
low temperature combustion
emission characteristics
