摘要
在柴油机微粒捕集器(DPF)的再生过程中,要保证DPF内压降损失、温度峰值及温度梯度不超过安全阈值.基于AVLFIRE软件建立DPF三维仿真模型,模型验证后对再生过程中DPF内部的轴向和径向碳烟沉积量变化和温度分布特性进行数值模拟研究;并应用正交试验设计方法,研究DPF入口温度、排气氧含量和初始碳烟量对再生特性的影响.研究表明:轴向越靠近后端剩余微粒沉积量越少,径向越靠近边缘剩余微粒沉积量越多;再生时,越靠近轴向后端壁面温度越高,越靠近径向边缘壁面温度越低;对DPF壁面温度峰值和剩余微粒沉积量影响程度最大的是入口温度,对压降损失峰值影响最大的是初始碳烟量.
During the regeneration process of diesel particulate filter(DPF), it is necessary to ensure that the pressure drop, peak substrate temperature, and temperature gradient in the DPF do not exceed the safety threshold. A three-dimensional DPF simulation model was developed by using AVL FIRE software. After the model was verified, the axial and radial soot deposition and temperature distribution characteristics inside the DPF were numerically simulated. The orthogonal experimental design method was used to study the influence of DPF inlet temperature, exhaust oxygen concentration, and initial soot mass on regeneration characteristics. The results show that the closer axial direction is to the substrate outlet, the less the amount of particles remains, and the closer radial direction is to the edge, the greater the amount of particles remains. During regeneration process, the closer axial direction is to the substrate outlet, the higher the wall temperature, and the closer radial direction is to the edge, the lower the wall temperature. The inlet temperature has the greatest influence on the peak wall temperature and the amount of remaining particles, while the initial soot mass has the greatest influence on the peak pressure drop.
作者
王鹏
毕玉华
韩慧芳
万明定
彭益源
WANG Peng;BI Yuhua;HAN Huifang;WAN Mingding;PENG Yiyuan(Yunnan Province Key Laboratory of Internal Combustion Engines,Kunming University of Science and Technolog,Kunming 650500,China;Kunming Yunnei Power Co.Ltd.,Kunming 650217,China)
出处
《昆明理工大学学报（自然科学版）》
北大核心
2021年第5期46-55,共10页
Journal of Kunming University of Science and Technology(Natural Science)
基金
国家自然科学基金重点项目(51765025)
云南省基础研究重点项目(2018FA030)
云南省重大科技专项计划项目(2018ZE001)。
关键词
柴油机
柴油机微粒捕集器
再生特性
微粒沉积分布
正交设计
diesel engine
diesel particulate filter
regeneration characteristics
particulate deposition distribu-tion
orthogonal design
