柴油机颗粒捕集器孔道流场及其高原环境下噪声特性分析  

Analysis of diesel particulate filter channel flow field and its noise characteristics in plateau environment

作　　者：陈贵升[1,2] 罗国焱 李靓雪 黄震[1,2] 李一 CHEN Gui-sheng;LUO Guo-yan;LI Liang-xue;HUANG Zhen;LI Yi(College of Transportation Engineering,Kunming University of Science and Technology,Kunming 650500,China;Yunnan Key Laboratory of Internal Combustion Engine,Kunming University of Science and Technology,Kunming 650500,China;Yunnan Filter Environment Protection Science&Technology Corporation Limited,Kunming 650300,China)

机构地区：[1]昆明理工大学交通工程学院,昆明650500 [2]昆明理工大学云南省内燃机重点实验室,昆明650500 [3]云南菲尔特环保科技股份有限公司,昆明650300

出　　处：《吉林大学学报（工学版）》2023年第7期1892-1901,共10页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(51866004).

摘　　要：基于CFD软件搭建柴油机颗粒捕集器(DPF)三维模型,研究了碳烟及灰分分布形式对非对称结构DPF孔道气流运动的影响;通过建立一维热力学整机模型研究高原环境下DPF载体尺寸、壁厚、进/出口孔径比对其噪声特性的影响。结果表明:DPF进气孔道流速沿始端轴向先增大后减小,从中心线始端沿壁面径向位置降低。高原环境下,载体直径比载体长度对噪声的影响更为显著;载体直径190 mm比直径170 mm对噪声衰减效果更好,达3 dB以上;进/出口孔径比为1.1时,DPF排气端噪声最低,且噪声衰减幅度随碳载量(0~8 g/L)增加而变大,降幅约3 dB。A 3D model of Diesel Particulate Filter(DPF)was established by CFD software,the influence of soot and ash distribution on the airflow movement of dissymmetric DPF ducts was studied.A one-dimensional thermodynamic model of engine was used to analyze influence of the DPF carries size,wall thickness,and the inlet/outlet aperture ratio on exhaust noise under plateau environment.The results showed that:the flow velocity of DPF inlet port has been increases first and then decreases axially from the beginning end.The flow velocity of the DPF inlet port has been decreases radially from the center.The carrier diameter has significant impact on noise than the length under plateau environment.The carrier diameter of 190 mm has a better noise attenuation effect than the diameter of 170 mm,reaching more than 3 dB.The inlet/outlet aperture ratio is 1.1,the end of DPF noise is the lowest,the attenuation amplitude increases with the increase in carbon loading(0~8 g/L),the noise attenuation effect is better more than 3 dB.

关 键 词：动力机械工程 柴油机 计算流体动力学(CFD) 颗粒捕集器 高原环境 噪声特性 孔道流场 灰分分布系数 

分 类 号：TK442[动力工程及工程热物理—动力机械及工程]