基于正交试验设计的载体结构对柴油机颗粒捕集器工作特性的影响研究OA北大核心CSTPCD

A mathematical model for diesel particulate filter(DPF)pressure drop and capture efficiency was developed in order to lower the pressure drop and improve the capture efficiency of DPF.The impacts of carrier ratio(x1),wall thickness(x2)and cell density on DPF performance were methodically examined using an experimental methodology and polynomial approximation algorithm.The results show that pressure drop and capture efficiency are highly influenced by carrier ratio and wall thickness.The DPF pressure drop is relatively low and the capture efficiency is relatively good when the carrier ratio and wall thickness are within the ranges of(1.40,1.53)and(0.249,0.267)mm,respectively.At a carrier ratio of 1.52 and a wall thickness of 0.264 mm,the pressure drop reaches a minimum of 4.2 kPa,with a capture efficiency of 90.28% .The polynomial approximation algorithm yielded explicit expressions for the pressure drop model and capture efficiency model:pressure drop model Y=51.19+3.815x1-8.726x2+3.794x21-1.735x1x2+0.524x22,capture efficiency model Y=0.383+0.105x1+0.085x2+0.032x21-0.016x1 x2-0.003 2x22.With coefficients of determination of 0.999 6 and 0.998 5,respectively,and root mean square errors of 0.011 0 and 0.000 2,respectively,the DPF pressure drop and capture efficiency models show good predictive accuracy and goodness of fit.