微粒捕集器连续再生速率与压降特性研究  

Study of the Continuously Regenerating Rate and the Pressure Drop Characteristics in Diesel Particulate Filter

作　　者：龚金科[1] 龙罡[1] 余明果[1] 王曙辉[1] 刘云卿[1] 

机构地区：[1]湖南大学机械与运载工程学院,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2009年第6期22-27,共6页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(50876027);国家863计划资助项目(2008AA11A116)

摘　　要：建立了连续再生模型,并通过台架实验进行了验证,用数值模拟的方法对柴油机不同工况下的连续再生速率和压降特性进行了数值研究.研究结果表明:当排气流量增大时,连续再生速率降低,压降迅速增大;当排气温度升高时,连续再生速率迅速升高,压降略有增大,但随着再生时间的增加,压降下降明显;随着排气气流中m(NO2)/m(soot)比率的下降,再生速率迅速降低,当超过临界比率时,会由微粒净消耗状态转变为净增加状态,m(NO2)/m(soot)比率对于压降影响很小.研究结果对于优化连续再生微粒捕集器的再生条件提供了理论依据.Based on the bench test, a continuously regenerating model was proposed. Using this model, the effect of different diesel driving cycles on continuously regenerating rate and pressure drop characteristics was studied by numerical simulation. It was shown that with the increase of the flow rate of the exhaust stream, the regeneration rate reduced and the pressure drop increased rapidly, and that with the increase of the temperature of the exhaust stream, the regeneration rate increased rapidly and the pressure drop increased modestly, and when the regeneration time was extended, the pressure drop reduced noticeably. With the decrease of the m（NO2）/m （soot） ratio of the exhaust stream, the regeneration rate reduced rapidly. If the ratio was lower than a certain critical ratio, the working state of the CR-DPF would be changed from net consumption to net gain. And the ratio had a minor effect on the pressure drop.

关 键 词：微粒捕集器 连续再生 柴油机工况 数值模拟 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]