摘要
运用计算流体动力学对汽车排气污染物控制装置———催化转换器进行了研究。通过对 4种不同引流区结构的速度场、压力场的计算 ,证明引流区的结构对催化转化装置的气流分布影响很大 ,应尽量避免采用直壁无引流过渡的结构 ,采用平滑过渡的引流区 ,不仅可减少涡流损失 ,而且压力损失大大小于其它结构。对实际汽车用催化转化器在不同排气流量下的速度场和压力损失进行了计算和对比。采用Ansys/FlotranCFD计算流体动力学软件 ,其计算结果与试验结果吻合较好 ,证明采用的方法是可靠的。
Computer fluid dynamics (CFD) is adopted to simulate that exhaust gas flows through catalyst converter. Four structures of catalyst converter are calculated. The result shows that the structure of catalyst converter is very important to the velocity field and pressure field of emission gas in it. The structure having smooth inlet zone can largely reduce vortex loss and pressure loss. Non smooth inlet zone should be avoided . it is calculated and analyzed for a certain catalyst converter at four gas velocities using CFD software. The results of CFD are agree with testing results. That is to say, the method used in this paper is right. It is helpful for optimizing catalyst converter for warm up speed and emission reduction efficiency..
出处
《车用发动机》
北大核心
2001年第4期25-28,共4页
Vehicle Engine
