柴油机微粒捕集器热再生场协同分析

Field Synergy Principle Analysis on Thermal Regeneration of Diesel Particulate Filter

基于柴油机微粒捕集器热再生机理,建立了CFD三维仿真模型,并利用场协同原理的数学模型对柴油机微粒捕集器过滤体热再生过程的速度矢量和温度梯度进行了场协同分析,研究各因素对场协同度的影响,结果表明:在低速大负荷工况下,微粒捕集器过滤体内的场协同度较高;进气扩张管的扩张锥角对过滤体内场协同度的影响很小,可忽略不计;采用较小的过滤体长径比能够有效增大高场协同度区域占整体区域的比例.计算结果与试验结果变化趋势较为吻合,数值误差较小,表明该模型较为准确,精度符合计算要求.

Based on the mechanism of thermal regeneration of diesel particulate filter, a CFD model was estab- lished. Field synergy analysis on velocity vector and temperature gradient during thermal regeneration process of diesel particulate filter were carried out using the field synergy model. In this model, each impact factor of field synergy was analyzed. Results show that field coordination index is higher under low speed and heavy load condition. Expansion cone angle has little impact on field coordination index. With the decrease of length-diameter ratio of filter, the ratio of the area of higher field coordination index is increased. Calculated results show good agreement with the experimental data, indicating that the model is accurate for calculation.