プール火炎のクエンチングによって生成されたPMの性状

抄録

Nanometer size Particulate Matter (PM) exhausted from internal combustion engine is one of the major air pollutants, and its reduction technologies are required. In this study, in order to clarify characteristics of PM formed by flame quenching process, a laminar pool flame of toluene was quenched using a slide and rotary metal mesh system. Mass concentrations of PM deposited on the metal mesh (Deposit-PM) and PM passed through the metal mesh (Through-PM) were measured at various positions in the flame. As the result, the mass concentrations of Deposit-PM and Through-PM resulted in maximum at the midstream part in the flame. In addition, True density of PM was measured by a Pycnometry system. As the result, the true density increases towards the downstream part in the flame, and the true density of Through-PM was higher than Deposit-PM. Furthermore, oxidation characteristics of PM was measured by a Thermo Gravimetric Analyzer. As the result, it was considered that the oxidation temperature of PM at downstream part in the flame was higher than that of PM at upstream part in the flame.