DPF孔道结构参数优化设计
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摘要
以降低流动阻力为目的开展DPF孔道结构参数优化设计,运用GT-Power建立DPF仿真模型,研究非对称孔道边长比、孔密度和过滤壁厚对颗粒物捕集过程中DPF压降和捕集效率的影响,并以非对称孔道边长比、孔密度和过滤壁厚为设计参数,二次序列规划算法为优化算法,DPF捕集效率为约束,优化DPF孔道结构参数。结果表明:DPF采用进口孔道边长大于出口孔道边长的非对称孔道结构可以降低颗粒物饼层捕集过程中DPF的压降,但同时降低了DPF的捕集效率;采用提高孔密度的方法可以在一定范围内降低DPF的压降,同时提高DPF的捕集效率;降低DPF过滤壁厚可以有效降低DPF压降,但也会降低DPF的捕集效率。综合优化结果,DPF进出口孔道边长比值为1.024 8、孔密度为62孔/cm~2、过滤壁厚为0.333 mm时,DPF压降降低26%以上,饼层捕集效率保持98%以上。
The optimization and design of DPF channel structure parameter was carried out to reduce the flow resistance. GT-Power was used to establish DPF simulation model which was applied to study the influence of the asymmetrical channel side length ratio, cell density and filter wall thickness on DPF pressure drop performance and collection efficiency during the particle collection process. Then DPF channel structure parameter was further optimized with quadratic programming algorithm according to the above mentioned design parameters and the collection efficiency constraint. The study results show that the asymmetric channel structure that the channel side length of inlet is larger than that of outlet can decrease the pressure drop during the collection process of particle cake layer, but decreases the collection efficiency of DPF. The increase of cell density can decrease the pressure drop in a certain range and increase the collection efficiency. The decrease of filter wall thickness can decrease the pressure drop, but the collection efficiency also decreases. Accordingly, when the ratio of inlet and outlet channel side length is 1.024 8, the cell density is 400 cpsi, and the filter wall thickness is 0.333 mm, the pressure drop of DPF decreases by more than 26% and the particulate collection efficiency keeps higher than 98%.Key words:
The optimization and design of DPF channel structure parameter was carried out to reduce the flow resistance. GT-Power was used to establish DPF simulation model which was applied to study the influence of the asymmetrical channel side length ratio, cell density and filter wall thickness on DPF pressure drop performance and collection efficiency during the particle collection process. Then DPF channel structure parameter was further optimized with quadratic programming algorithm according to the above mentioned design parameters and the collection efficiency constraint. The study results show that the asymmetric channel structure that the channel side length of inlet is larger than that of outlet can decrease the pressure drop during the collection process of particle cake layer, but decreases the collection efficiency of DPF. The increase of cell density can decrease the pressure drop in a certain range and increase the collection efficiency. The decrease of filter wall thickness can decrease the pressure drop, but the collection efficiency also decreases. Accordingly, when the ratio of inlet and outlet channel side length is 1.024 8, the cell density is 400 cpsi, and the filter wall thickness is 0.333 mm, the pressure drop of DPF decreases by more than 26% and the particulate collection efficiency keeps higher than 98%.Key words:
引文
[1] 李明月.移动污染源排放清单研究[D].北京:北京理工大学,2016.
[2] 魏明.喷油助燃式颗粒捕集器数值模拟及试验研究[D].合肥:合肥工业大学,2015.
[3] 白曼,赵昌普,尚芳,等.非对称孔结构对柴油机颗粒捕集器压降特性的影响[J].内燃机学报,2015,33(3):257-264.
[4] 黄群锦.DPF灰分分布和非对称结构对其性能影响的研究[D].天津:天津大学,2016.
[5] 张兆合,任丽娟,王树芬.柴油机排气烟雾不同表达方法之间的关系[J].农业机械学报,2008,39(4):43-46.
[6] 韦雄,冒晓建,祝轲卿,等.基于机内技术的DPF再生控制策略研究[J].农业机械学报,2013,44(11):1-5,11.
[7] 朱亚永,赵昌普,王耀辉,等.柴油机DPF流场压降及微粒沉积特性数值模拟[J].内燃机学报,2017,35(6):538-547.
[8] 陈鹏,孟忠伟,李路,等.温度对DPF过滤参数影响的试验研究[J].车用发动机,2015(2):57-60,65.
[9] 张辉.轿车柴油机微粒捕集器工作过程数值模拟及再生控制策略研究[D].长春:吉林大学,2011.
[10] Daido S,Takagi N.Visualization of the PM deposition and oxidation behavior inside the DPF wall[C].SAE Paper 2009-01-1473.
[11] 赖宇阳.Isight参数优化理论与实例详解[M].北京:北京航天航空大学出版社,2012.
[2] 魏明.喷油助燃式颗粒捕集器数值模拟及试验研究[D].合肥:合肥工业大学,2015.
[3] 白曼,赵昌普,尚芳,等.非对称孔结构对柴油机颗粒捕集器压降特性的影响[J].内燃机学报,2015,33(3):257-264.
[4] 黄群锦.DPF灰分分布和非对称结构对其性能影响的研究[D].天津:天津大学,2016.
[5] 张兆合,任丽娟,王树芬.柴油机排气烟雾不同表达方法之间的关系[J].农业机械学报,2008,39(4):43-46.
[6] 韦雄,冒晓建,祝轲卿,等.基于机内技术的DPF再生控制策略研究[J].农业机械学报,2013,44(11):1-5,11.
[7] 朱亚永,赵昌普,王耀辉,等.柴油机DPF流场压降及微粒沉积特性数值模拟[J].内燃机学报,2017,35(6):538-547.
[8] 陈鹏,孟忠伟,李路,等.温度对DPF过滤参数影响的试验研究[J].车用发动机,2015(2):57-60,65.
[9] 张辉.轿车柴油机微粒捕集器工作过程数值模拟及再生控制策略研究[D].长春:吉林大学,2011.
[10] Daido S,Takagi N.Visualization of the PM deposition and oxidation behavior inside the DPF wall[C].SAE Paper 2009-01-1473.
[11] 赖宇阳.Isight参数优化理论与实例详解[M].北京:北京航天航空大学出版社,2012.