摘要
为了提高柴油机选择性催化还原(selective catalytic reduction,SCR)后处理系统氨气分布均匀性,设计了扇形和百叶窗型两种不同的混合器结构。利用计算流体动力学(computational fluid dynamics,CFD)技术对这两种混合器结构进行了优化处理,并针对优化后的两种混合器方案,对其速度均匀性、氨气均匀性、压力损失等进行了仿真分析和对比。CFD分析结果表明:百叶窗型混合器结构催化器载体前端氨气分布均匀性更高,百叶窗型混合器的压力损失小于扇形的;进一步分析排气流量和排气温度对氨气均匀性影响,排气流量增加使得氨气均匀性指数降低,排气温度增加使得氨气均匀性指数增高;百叶窗型的氨气均匀性指数高于扇形的。综合考虑,百叶窗型结构混合器优于扇形结构。
In order to improve the ammonia distribution uniformity of diesel selective catalytic reduction(SCR)post-treatment system,two different mixer structures,fan-shaped and louver,were designed.The two mixer structures were optimized by using computational fluid dynamics(CFD)technology.For the optimized two mixer schemes,the velocity uniformity,ammonia uniformity and pressure loss were simulated,analyzed and compared.The CFD analysis results show that the louver mixer structure has higher ammonia distribution uniformity at the front end of the catalyst carrier,and the pressure loss of the louver mixer is less than that of the fan-shaped one.Further analysis of the impact of exhaust flow and exhaust temperature on ammonia uniformity shows that an increase in exhaust flow leads to a decrease of ammonia uniformity index,while an increase in exhaust temperature leads to an increase of ammonia uniformity index.The ammonia uniformity index of louver type is always higher than that of fan-shaped structure.Overall,the louvered structure mixer is superior to the fan-shaped structure.
作者
王国贤
吴红静
吴华伟
赵千
杨小兵
WANG Guoxian;WU Hongjing;WU Huawei;ZHAO Qian;YANG Xiaobing(School of Transportation and Logistics Engineering,Wuhan University of Technology,Wuhan 430063,Hubei,China;School of Automotive and Traffic Engineering,Hubei University of Arts and Science,Xiangyang 441053,Hubei,China;Dongfeng Faurecia(Xiangyang)Exhaust System Co.,Ltd.,Xiangyang 441000,Hubei,China)
出处
《重庆交通大学学报（自然科学版）》
CAS
CSCD
北大核心
2023年第5期145-151,共7页
Journal of Chongqing Jiaotong University(Natural Science)
基金
中央引导地方科技发展财政专项项目(鄂财政2017[80]号文)
湖北省技术创新专项重大项目(2017AAA133)
湖北省自然科学基金青年基金项目(2020CFB320)
“机电汽车”湖北省优势特色学科群开放基金项目(XKQ2021003,XKQ2021010)。
关键词
车辆工程
选择性催化还原
混合器
分布均匀性
压力损失
vehicle engineering
selective catalytic reduction
mixer
distribution uniformity
pressure loss
