| Summary: | 碩士 === 臺灣大學 === 機械工程學研究所 === 98 === Microgravity experiments were performed to investigate the combustion characteristics of blended fuels with alcohol(Methanol, Ethanol and Propanol) and Biodiesel/Diesel. The microgravity environment was made by a 0.68 second drop tower. Measurements include the burning rate , the formation of soot and flame structure. These experiments demonstrated significant influence of the increasing alcohol mass fraction. The information of evolution of droplet diameter, burning rate, soot shell diameter and flame diameter are reported.
The micro-explosion is observed for the binary component fuels mixed with alcohol because the fiber (or the internal impurities) is easier to achieve the limit of superheat. The results indicated that increasing the initial mass fraction of the alcohol, which has lower boiling point, increased burning rate, delayed the formation of soot shell and reduced the production of soot. The flame molecule restricted by the strong soot shell. The flame will be expanded instantaneously because of the vapour escaping from the broken soot shell.
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