Studies on Combustion Nuclei

大气中亚微米粒子的浓度和大小分布对大气污染、气象现象、工业和生物洁净室的高纯度等影响很大，因此研究亚微米粒子的浓度和大小分布具有重要意义。大气微粒的组成和大小差别很大。粒径分布的变化被认为是由混凝、沉降、扩散等运动现象引起的。本研究对城市空气中的亚微米颗粒进行了连续测量，并对燃烧产生的亚微米颗粒进行了测量。本研究采用三种类型的计数器对城市空气中的亚微米粒子进行连续测量。讨论了峰的大小和大小分布的变化。结果表明，混凝是导致尺寸分布变化的有效运动现象之一。此外，在实验室内进行了燃烧产生的亚微米颗粒的测量，并以混凝的方式描述了结果。粒径分布的变化特征与大气中亚微米颗粒的变化特征相似。

It is important to study the concentration and size distribution of submicron particles in the atmosphere because of their great influence on air pollution, meteorological phenomena, high purity of industrial and biological clean rooms, etc. The atmospheric particles vary widely in composition and size. The change of size distribution is considered to be caused by coagulation, settling, diffusion and other kinematic phenomena.In this study, continuous measurements of submicron particles in urban air and measurements of submicron particles generated by combustion are conducted. This study presents continuous measurements of submicron particles in urban air by using three type counters. The peak size and the changes of size distribution are discussed. The results show that coagulation is one of the effective kinematic phenomena for the change of size distribution. Furthermore, measurements of submicron particles generated by combustion are conducted in an experimental chamber and the results are described in terms of coagulation. The changing characteristics of size distribution are similar to that of submicron particles in atmosphere.