Ignition of a Binary Component Fuel Droplet in a Rapid Compression Machine: Comparative Analysis

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The autoignition characteristics of a binary component fuel droplet inside a rapid compression machine (RCM) were investigated. An RCM is an experimental setup for simulating a single compression stroke of an internal combustion engine. During the experimental time, the temperature and pressure inside the reaction chamber were temporally varied, and the ignition of a binary component droplet occurred when sufficient fuel vapor was generated around the droplet. n-Heptane was selected as the base fuel, and a specific volumetric ratio of iso-octane and n-decane was added as fuel additives. The droplet was placed at the center of the reaction chamber by suspending at the tip of a thermocouple, and its transient temperature was measured. The initial droplet diameter was in the range of 450-1000 mu m, and the temporal variation of droplet diameter was measured by analyzing images from a high-speed charge-coupled device array camera. In the single component experiments, a monotonic increase of the ignition delay with droplet diameter was observed, and the gradient was different for n-heptane and n-decane. The iso-octane droplet did not ignite in the present experimental conditions. The addition of iso-octane in n-heptane increased the ignition delay by dissipation of n-heptane vapor and an autoignition temperature change. The ignition delay and maximum droplet diameter ignition limit rapidly changed when the volume fraction of iso-octane was approximately 0.5, and the effect of iso-octane on the ignition delay was diminished for lower volume fractions. The ignition delay also increased with n-decane addition by suppressing the evaporation process. Compared to iso-octane, the increase in the n-decane volume fraction resulted in a gradual change of the ignition delay and maximum droplet diameter ignition limit due to the different mechanism of the ignition suppression process.
Publisher
TAYLOR & FRANCIS INC
Issue Date
2015-01
Language
English
Article Type
Article
Keywords

N-HEPTANE DROPLET; FORCED-CONVECTION; AUTO-IGNITION; COMBUSTION; AUTOIGNITION; SIMULATIONS; EVAPORATION; PRESSURE; BEHAVIOR

Citation

COMBUSTION SCIENCE AND TECHNOLOGY, v.187, no.4, pp.659 - 677

ISSN
0010-2202
DOI
10.1080/00102202.2014.960563
URI
http://hdl.handle.net/10203/195576
Appears in Collection
AE-Journal Papers(저널논문)
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