| 1. | In order to study the regeneration mechanism of dpf in detail , we still need a mathematical model of the channel unit , which present temperature field and the soot reaction rate of the channel . finally , it points out the influences of various factors to the regeneration process by computing the numerical solution of model under different boundary conditions and geometry parameters , such as the initial temperature , the gas flow rate , the oxygen concentration , the sediment quantity and the wall thickness of the filters , and so on . in this way , the paper provides theoretical guidance for optimization design of the dpf
首先研究了干净壁流式过滤体的加热特性,然后在加热和燃烧理论的基础上建立了微粒捕集器再生过程的数学模型,并对模型进行了数值计算,得到了捕集器内部的三维温度场分布以及温度梯度分布,结果与实验值吻合较好,验证了模型的正确性;为了详细的研究微粒捕集器的再生机理,建立了孔道单元数学模型,得到了孔道内的温度场分布和微粒反应速率分布;最后,通过求解模型在不同边界条件和不同几何参数下的数值解,分析了各种因素对再生过程的影响,如过滤体初始温度、过滤体内气流的流动速率、氧浓度、微粒沉积量以及过滤体壁面厚度,为微粒捕集器的优化设计提供理论指导。 |
