柴油机碳烟颗粒物的分形生长分析与凝聚控制

The analysis and its agglomeration control of soot particles fractal growth

中文关键词  碳烟颗粒物  凝聚  分形生长  控制  柴油机

英文关键词  soot particles  agglomeration  fractal growth  control  diesel engine

中文摘要

      本文针对柴油机械的主要排放颗粒物–碳烟颗粒物, 基于其分形生长物理数学模型, 模拟了单微粒与单微粒、单微粒与团簇、团簇与团簇凝聚体碰撞的形态结构, 结合碰撞频率, 利用主要环境因素干扰对柴油机碳烟颗粒 物的分形生长进行凝聚控制, 使其凝聚成规则的几何体或密度较大的颗粒物, 减少表面积和复杂度, 减小粘滞阻力和对有毒颗粒物的吸附, 以便于捕捉器的捕捉或沉降, 实现了环境污染的防控. 数值仿真结果表明此凝聚控制分析是可行、有效的, 这将有助于理解和分析实际碳烟颗粒物非平衡凝聚生长的物理机制和动力学行为, 为进一步降低可吸入性柴油机颗粒物的排放提供思路.

英文摘要

      Based on the fractal growth physical model of soot particles from large diesel agriculture machinery, this paper simulates the morphological structure of collision for the single particles and single particles, single particle and clusters, clusters and clusters, firstly. Moreover, combining with the collision frequency, the fractal growth is controlled to agglomeration using the main environmental factors interference for diesel engine soot particles, in order to make them condensed into regular geometry or larger density particles, reduce the viscous drag for capturing by the capturer or settlement and to realize the control of the pollution of the environment. The results of numerical simulation show that the proposed method are feasible and effective, which will help to understand and analyze the physical mechanism and kinetics of non-equilibrium condensation growth behavior of the actual carbon smoke particles and provide the solution to further reduce emissions of the inhalable particulate matter from diesel engines.