天津大学学报
天津大學學報
천진대학학보
Journal of Tianjin University
2015年
10期
914-920
,共7页
李志军%侯普辉%焦鹏昊%鲁鹏%杨智%申博玺%杨阳
李誌軍%侯普輝%焦鵬昊%魯鵬%楊智%申博璽%楊暘
리지군%후보휘%초붕호%로붕%양지%신박새%양양
柴油机%微粒捕集器%流场%离散相
柴油機%微粒捕集器%流場%離散相
시유궤%미립포집기%류장%리산상
diesel engine%particulate filter%flow field%discrete phase
通过Fluent软件建立了柴油机微粒捕集器(diesel particulate filter,DPF)计算模型,运用离散相模型模拟计算了孔道内部气体与微粒的流动,并针对不同壁面渗透率及滤饼层厚度进行了研究。结果表明:沿DPF长度方向,进气孔道内气流速度逐渐降低,排气孔道内气流速度逐渐增大,壁面渗流速度也逐渐增大;渗透率的增大会加剧DPF 孔道内速度的变化,同时引起进气孔道内静压下降,但对排气孔道静压影响不大;微粒在 DPF 孔道内分布具有不均匀性,后端沉积较多而前端较少;随着滤饼层厚度的增加,微粒分布不均匀性逐渐降低,压降受DPF进气流速的影响则逐渐增大。
通過Fluent軟件建立瞭柴油機微粒捕集器(diesel particulate filter,DPF)計算模型,運用離散相模型模擬計算瞭孔道內部氣體與微粒的流動,併針對不同壁麵滲透率及濾餅層厚度進行瞭研究。結果錶明:沿DPF長度方嚮,進氣孔道內氣流速度逐漸降低,排氣孔道內氣流速度逐漸增大,壁麵滲流速度也逐漸增大;滲透率的增大會加劇DPF 孔道內速度的變化,同時引起進氣孔道內靜壓下降,但對排氣孔道靜壓影響不大;微粒在 DPF 孔道內分佈具有不均勻性,後耑沉積較多而前耑較少;隨著濾餅層厚度的增加,微粒分佈不均勻性逐漸降低,壓降受DPF進氣流速的影響則逐漸增大。
통과Fluent연건건립료시유궤미립포집기(diesel particulate filter,DPF)계산모형,운용리산상모형모의계산료공도내부기체여미립적류동,병침대불동벽면삼투솔급려병층후도진행료연구。결과표명:연DPF장도방향,진기공도내기류속도축점강저,배기공도내기류속도축점증대,벽면삼류속도야축점증대;삼투솔적증대회가극DPF 공도내속도적변화,동시인기진기공도내정압하강,단대배기공도정압영향불대;미립재 DPF 공도내분포구유불균균성,후단침적교다이전단교소;수착려병층후도적증가,미립분포불균균성축점강저,압강수DPF진기류속적영향칙축점증대。
A calculation model of diesel particulate filter(DPF)was established using the software Fluent. The flow of air and particulate matter(PM)in the channels were simulated and calculated using discrete phase model(DPM)under the condition of different permeabilities and soot thicknesses. The results show that the velocity profile decreases along the inlet channels of DPF,and increases along the outlet channels;wall flow velocity also increases along the axial direction;the increase of permeability intensifies the change of velocity,decreasing the static pressure along the inlet channels at the same time,with no significant effect on the static pressure along the outlet channels. Mean-while the soot distribution is uneven along the channels,and the back end of DPF contains a higher soot load than the front. As the soot cake thickness increases,the unevenness of soot distribution is reduced and the pressure drop changes more significantly as a function of the inlet velocity of DPF.