Flame-Spread Characteristics of n-Decane Droplet Arrays at Different Ambient Pressures in Microgravity

DOI:10.15011/ijmsa.33.330108
Int. J. Microgravity Sci. Appl. 2016p330108
Author
N. SANO, N. MOTOMATSU, H. SAPUTRO, T. SEO and M. MIKAMI
Organization
Graduate School of Science and Engineering, Yamaguchi University
Abstract
This research involves microgravity experiments being conducted on flame spread over fuel droplet arrays at different pressures including low-pressure condition in order to improve understanding of flame-spread characteristics under high-altitude relight condition of jet engines. n-Decane was used as a fuel. The ambient pressure ranged from 25 to 200 kPa. The results show that the flame-spread rate and flame-spread-limit distance decreased with an increase in ambient pressure. As the ambient pressure is increased, the thermal conduction time from the flame of a droplet to the next unburned droplet increases due to the decreased thermal diffusivity, and the droplet heating time also increases due to the increased fuel boiling point, resulting in a decrease in the flame-spread rate and -limit distance. The pressure effect on the flame-spread limit around two interactive burning droplets is also discussed.
Keyword(s)
Flame Spread, Droplet Array, Pressure Effect, Microgravity
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Received 1 Oct. 2015, Accepted 8 Dec. 2015, Published 31 Jan. 2016

© The Japan Society of Microgravity Applicaiton

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