An Experimental Study on the Combustion of Binary-Fuel Droplets under Microgravity Conditions
Date Issued
2008
Date
2008
Author(s)
Chen, Chien-Pei
Abstract
Making use of freely falling in the experiment generates microgravity conditions, which can provide an environment for the droplets combustion without the convection, and enables us to the observe characteristics of combustion. The single-component fuels used in this experiment were biodiesel, diesel, dodecane, hexadecane, ethanol and dodecanol, the droplets of binary fuel mixtures include ethanol/biodiesel, dodecanol/biodiesel and dodecane/biodiesel. The experimental results showed that the burning rate would decrease with increasing the initial droplet diameter for sooting fuels. In contrast to sooting-free fuels, the burning rate is almost independent of the initial droplet diameter. Ethanol droplets will extinguish when the combustion process come to an end. The micro-explosion is observed for ethanol/biodiesel mixtures when the volume fraction of ethanol is 25% and 50%, but the droplets will extinguish for the 75% volume fraction of ethanol. The flame shrinkage is observed for the volume fraction of dodecane above 60% for dodecane/biodiesel. The burning rate is almost independent of the volume fraction for dodecanol/biodiesel droplets.
Subjects
droplet
microgravity
combustion
micro-explosion
flame shrinkage
Type
thesis
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