| Summary: | 碩士 === 國立成功大學 === 機械工程學系碩博士班 === 96 === In this research, a single-phase drop stream (diesel, dodecane) and a water-in-dodecane compound drop stream were produced by utilizing of a piezoelectric drop generator. These drop streams entered a high temperature environment and burned as freely falling drops. For the purpose of providing a heat source of high temperature environment, a vertical combustion chamber was built, which was maintained by a steady flat premixed flame. The behavior of drop stream and the combustion phenomenon of single-phase and compound drop streams were observed.
In the research, the evaporation rate of a single-phase drop would increases with the oxygen content in the high temperature environment. However, the evaporation rate of a compound drop would not change with the oxygen content. The evaporation rate of compound drop was smaller than that of a single-phase drop because of the water core influence. But the varying of the quantity of water inside the compound drop would not influence the evaporation. In the combustion characteristic research of the single-phase drop, the flame length would increase with the increasing oxygen content. For the compound drop, the flame would go out because the outer layer oil film was consumed by evaporation and no fuel vapor was available. After the oil film was exhausted and the water drop was exposed to the high temperature environment, the evaporation rate showed an increasing trend.
|
|---|
