汽油机GPF再生特性数值模拟

Numerical Simulation of GPF Regeneration Characteristics of Gasoline Engine

利用AVL-Fire软件建立汽油机微粒捕集器(GPF)三维计算模型。该模型考虑微粒滤饼层压降、灰分滤饼层压降、微粒深层压降和壁面层压降等压降损失,以及微粒再生化学反应。结果表明模拟值与试验值的GPF压降基本吻合。基于模型研究了不同的排气温度对GPF再生特性的影响。结果表明:提高排气温度,微粒沉积量曲线变陡,微粒再生速度增加,再生持续时间缩短。

Using AVL-FIRE software,a three-dimensional calculation model of gasoline engine particle filter(GPF) was established. The model takes into account the pressure drop of particle filter cake,ash filter cake,deep particle pressure drop and wall pressure drop,as well as the chemical reaction of particle regeneration. The results show that the simulated GPF pressure drop is in good agreement with the experimental one. Based on this model,the effects of different exhaust temperatures on the regeneration characteristics of GPF were studied. The results show that with the increase of exhaust temperature,the particle deposition curve steepens,the particle regeneration speed increases,and the regeneration duration decreases.