摘要
为研究SCR系统结构对尿素雾化效果的影响,利用计算流体力学(Computational Fluid Dynamics,CFD)软件建立尿素-SCR系统结构模型,进行尿素喷射及雾化过程仿真模拟,分析喷孔夹角及管道截面突变位置等结构参数对尿素-SCR系统雾化效果的影响。结果表明,增大喷孔夹角有利于促进NH3与排气气流的混合,考虑实际应用条件,喷射夹角在45°左右为最优;喷射管道与载体壳体之间的突变位置距载体前端面的位置逐渐增大,NH3浓度的标准偏差先减小,后增大,位于喷嘴与载体前端面中间位置处时,尿素与气流的混合效果最好。
In order to study the effect of structure on urea-SCR system atomization effect, used computational fluid dynamics （CFD） software to develop structure simulation model of the urea-Selective Catalytic Reduction （SCR）system, did the process simulation of urea spray and atomization, and analysis of the spray effect of urea-SCR by device structure factors such as injection hole angle and pipeline section mutation position. The results of the study show that the increase of the injection hole angle can help promote the mixing of NH3 and exhaust air , and considering the actual situation ,it is optimal when the Angle is at about 45 NH3 concentrations of standard deviation decreases first and increases after along with increases gradually of Jet pipe and the mutation position between the carrier shell from the carrier on the surface of the front end position. It is the best result of urea mixed with the air flow in the middle of the nozzle and the carrier before the end location.
出处
《汽车工程学报》
2013年第3期218-222,共5页
Chinese Journal of Automotive Engineering
基金
韶关学院校级科研项目(韶学院[2012]202号)
关键词
SCR系统
雾化效果
结构仿真
喷孔角度
管道截面突变位置
SCR system
atomizing effect
structure simulation
nozzle angle
pipe cross-section mutation position
