不同海拔下DPF对柴油机性能及其流动特性影响  

Effects of DPF at Different Altitudes on Diesel Engine Performance and Its Flow Characteristics

作　　者：陈贵升[1] 张涵[1] 陈家洪 罗赢 彭益源[3] 李春敏[3] Chen Guisheng;Zhang Han;Chen Jiahong;Luo Ying;Peng Yiyuan;Li Chunmin(Yunnan Key Laboratory of Internal Combustion Engine,Kunming University of Science and Technology,Kunming 650500,China;Unit 31638 of the Chinese People’s Liberation Army,Kunming 650203,China;Kunming Yunnei Power Company Limited,Kunming 650501,China)

机构地区：[1]昆明理工大学云南省内燃机重点实验室,云南昆明650500 [2]中国人民解放军31638部队,云南昆明650203 [3]昆明云内动力股份有限公司,云南昆明650501

出　　处：《内燃机学报》2022年第6期504-512,共9页Transactions of Csice

基　　金：国家自然科学基金资助项目(51866004);昆明理工大学分析测试基金资助项目(2021M20202206054);大学生创新创业计划资助项目(2021106740026)。

摘　　要：基于某高压共轨柴油机建立了柴油机一维热力学仿真模型及柴油颗粒捕集器(DPF)计算模型.研究了不同海拔下载体结构和灰分对柴油机及DPF性能的影响;探究了不同灰分分布系数以及不同海拔下DPF孔道内部流场及微粒沉积特性.结果表明:随海拔升高,柴油机动力性、经济性下降较明显,其中非对称结构载体对柴油机性能影响最小,3种不同结构载体压降和捕集效率均升高;随灰分分布系数的增大,DPF压降和捕集效率均升高,出口孔道中心线气流速度及压力均逐渐降低;灰分量的增大会导致DPF压降升高、捕集效率略有升高,海拔的变化不影响该趋势;随海拔升高,气流在进口孔道和出口孔道内运动速度和压力均增大,颗粒运动速度增加,颗粒浓度的不均匀性增强,颗粒逐渐向孔道后端集中.A one-dimensional thermodynamic simulation model of a high-pressure common rail diesel engine and a calculation model of the diesel particulate filter(DPF) were established. The influences of the structure and ash content of the DPF carrier on the engine and DPF performances were studied at different altitudes. The ash distribution coefficients,the internal flow field and particle deposition characteristics of the DPF ducts were explored. The research results show that with the increase in altitude,the power and fuel economy of the diesel engine decrease significantly. Among them,the asymmetric pore structure carrier has the least impact on the engine performance,and the pressure drop and collection efficiency of the three different carrier structures increase. With the increase of ash distribution coefficient,the pressure drop and capture efficiency increase,but the centerline velocity and the pressure of the outlet channel gradually decrease. In addition,the increase of ash content causes the DPF pressure drop and the collection efficiency to rise slightly,but the altitude change does not affect them. As the altitude increases,the velocity and pressure of the airflow in the inlet and outlet channels increase. As a result,the particle velocity increases,the nonuniformity of particle concentration is enhanced,and the particles gradually concentrate toward the rear end of the channel.

关 键 词：柴油机 柴油颗粒捕集器 流场 压降 

分 类 号：TK442[动力工程及工程热物理—动力机械及工程]