Investigation on the Burning Behavior of Multicomponent Fuel and Diesel Droplets
Date Issued
2015
Date
2015
Author(s)
Wei, Chia-Hsing
Abstract
This paper will focus on the experiment on droplets combustion behavior occurring while freely falling droplets enter the high-temperature glass tube, in which the freely falling droplets are attained by Ink-Jet printing method. During the experiment, a number of key phenomena have been observed and analyzed, including flame colors, flame shrinkage, ignition delay, burning time, burning rate, as well as micro-explosion. The experiment is mainly separated into two parts. The first is to observe the changes in combustion behavior as the blends of fuels with a variety of boiling point and carbon number are exploited, such as methanol, dodecanol, hexane, heptane, hexadecane, octadecane, and propanol. In the second part, the investigation of burning behavior with the blends of diesel-water-containing acetone-butanol-ethanol (WABE) is undertaken. According to the experiment results, combustion behavior is influenced by latent heat of vaporization, boiling point and chemical structure. The timing of flame shrinkage occurring depends upon the variety of boiling point. There is a tendency that when the proportion of the high boiling point fuel is increased in the composition, an earlier flame shrinkage and a longer ignition delay will be obtained. An interesting finding of the experiment is that micro-explosion occurs whatsoever when burning mixed fuels. As for WABE, adding WABE to diesel fuels will trigger micro-explosion. This not only makes the burning time shorter and the burning rate increased, but also significantly reduces soot formation.
Subjects
Droplets combustion
Flame shrinkage
Burning rate
WABE
Type
thesis
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