In response to the injection system of the NH3, which is injected into the flue, the gas is mixed along the flue, and it is easy to form a large gas vortex through the path of the flue, which is the problem of the high velocity difference. Flue is presented in this paper the second corner, in view of different flue structure and gas flow rate and composition of dif-ferent parameters, such as, based on the diagonal type flue design six kinds of guide plate arrangement, changes in flow rate and pressure loss analysis system, to obtain optimized layout scheme. At the same time, the relevant optimization scheme is verified by experiment. According to the experiment and simulation results, it is concluded that in the inclined type flue, the flow of the same guide plate is the best when it is arranged in a column, and the lowest value of the exit velocity is the low-est, and the pressure loss is the lowest. The results of this study provide a reference for diesel engine flue design.%针对还原剂NH3由喷射系统喷入烟道后与烟气混合途经烟道转弯处易形成大面积气体涡旋,流速差值较大这一问题,本文对烟道第2个拐角展开优化设计研究,旨在获得最优的速度场分布.具体的,基于斜型烟道设计了6种导流板的布置方式,分析系统内流速和压损变化,据此获得优化的布置方案.同时,搭建了实验平台,对相关优化布置方案进行实验验证.根据实验和模拟结果得出结论:在斜型烟道中,5块相同导流板一列布置时引流效果最好,此时出口流速差值最小,压损也最低.该研究结果为柴油机烟道设计提供了参考依据.
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