| Summary: | 碩士 === 國立臺灣大學 === 機械工程學研究所 === 96 === The objective of this study is to investigate the burning characteristics of fuel droplets under a microgravity condition. The microgravity condition is made by a free-falling chamber and the fuel droplets are ignited by hot wires. The phenomena of flame shape, the formation of soot, burning rate and flame shrinkage are also observed in this experiment. We use bio-diesel as our main fuel and pre-mix it with n-dodecane, n-hexadecane and diesel, respectively. The result of burning phenomena is discussed in several aspects, such as different volume fraction of mixture, different original diameter of fuel droplet, and compares it with gravity condition.
It is found that the strength of the soot shell of biodiesel is weak, and the soot particles disperse incessantly during the burning process. Bio-diesel mixed with n-dodecane improves the burning rate and causes the flame shrunk, while the rate only changes a little to the mixture of biodiesel and n-hexadecane. Moreover, fuel droplet is easier to ignite when the original diameter of it is smaller than another. It is also found that adding some bio-diesel in diesel can effectively reduce the production of soot. Therefore, the formation of soot plays an important role in microgravity combustion.
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