Optimization and Simulation for SCR Mixer of Diesel Engine

LIU Qiang; CHAI Yang; HU Xiaoyan; ZHANG Xiaoli; SHI Dailong; ZHANG Meng

Vehicle Engine ›› 2022, Vol. 0 ›› Issue (1) : 71-77.

LIU Qiang,CHAI Yang,HU Xiaoyan,ZHANG Xiaoli,SHI Dailong,ZHANG Meng

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Abstract

For the NH₃ uniformity of SCR mixer for China Ⅵ light-duty diesel engine, the NH₃ distribution inside SCR system was simulated with CFD and the simulation model was verified by the test of NH₃ distribution. The mixer structure was optimized and designed, and the influences of different static mixers on the structure of flow field, the uniformity of NH₃ distribution before SCR and the pressure drop of aftertreatment system were investigated. The results show that the simulated results of NH₃ distribution are consistent with the experimental results. Compared with the original mixer, the NH₃ uniformity of B2 mixer increases to 0.97 from 0.88 and the back pressure decreases to 19.2 kPa from 22.3 kPa. Therefore, the porous plate at the rear of the mixer can improve the NH₃ uniformity due to the enhancing air flow disturbance and increasing small urea droplet impact on the wall. B3 mixer shows that the porous plate that is not suitable for mixer will result in the decrease of NH₃ uniformity.

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SCR / mixer / NH₃ / uniformity / structural optimization / numerical simulation

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LIU Qiang,CHAI Yang,HU Xiaoyan,ZHANG Xiaoli,SHI Dailong,ZHANG Meng. Optimization and Simulation for SCR Mixer of Diesel Engine[J]. Vehicle Engine. 2022, 0(1): 71-77