Abstract
The characteristics of auto-ignition and micro-explosion behaviors of one-dimensional arrays of fuel droplets suspended in a chamber with high surrounding temperature were investigated experimentally with various droplet spacings, numbers of droplet and surrounding temperatures. The fuels used were pure n-decane and emulsified n-decane with varied water contents ranging from 10 to 30%. All experiments were performed under atmospheric conditions with high surrounding temperatures. An imaging technique using a high-speed camera was adopted to measure ignition delay, flame lifetime, and flame spread speed. The camera was also used to observe micro-explosion behaviors. As the droplet array spacing increased, the ignition delay also increased, regardless of water content. However, the lifetime of the droplet array decreased as the droplet spacing increased. The micro-explosion starting time remained unchanged regardless of the number of the droplets or the droplet spacing; however, it tended to be delayed slightly as the water percentage and droplet spacing increased.
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References
Brzustowski, T. A., Sobiesiak, A. and Wojcicki, S. (1981). Flame propagation along an array of liquid fuel droplets at zero gravity. Eighteenth Symp.(Int.) Combustion, 265–273.
Cook, D. H. and Law, C. K. (1978). A preliminary study on the utilization of water-in-oil emulsion in diesel engines. Combustion Science and Technology 18,5, 217–221.
Dryer, F. L. (1977). Water addition to practical combustion system concepts and applications, 16th Symp. (Int.) Combustion, 279–295.
Hanai, H., Watanabe, H., Kobayashi, H. and Niioka, T. (2001). Ignition of droplet array exposed to high-temperature low-speed airflow. 2nd Pan Pacific Basin Workshop on Microgravity Sciences, Paper CC-1131, 1–11.
Jeong, I. C. and Lee, K. H. (2007). Effect of ambient temperature and droplet size of a single emulsion droplet on auto-ignition and micro-explosion. Trans. Korean Society of Automotive Engineers 15,1, 49–55.
Nakanishi, R., Kobayashi, H., Kato, S. and Niioka, T. (1994). Ignition experiment of a fuel droplet in high-pressure high temperature ambient. 25th Symp.(Int.) Combustion, 447–453.
Okajima, S., Kumagai, S. (1982). Experimental studies on combustion of fuel droplets in flowing air under zero and higjh-gravity conditions. 19th Symp. (Int.) Combustion, 1021–1027.
Park, J., Hyun, D. S., Kobayashi, H. and Niioka, T. (1999). Comparative study of flame spread behaviors in one dimensional droplet array under supercritical pressures of normal gravity and microgravity. Trans. KSM 23,1, 131–139.
Reichenbach, R., Squires, D. and Penner, S. S. (1962). Flame propagation in liquid-fuel droplet arrays. 8th Symp.(Int) Combustion, 1068–1073.
Seo, H. J., Oh, S. M. and Huh, H. I. (2002). Spray characteristics and exhaust emission tests for a diesel engine using emulsified fuels. Trans. KSME 10,4, 60–68.
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Jeong, I.C., Lee, K.H. Auto-ignition and micro-explosion behaviors of droplet arrays of water-in-fuel emulsion. Int.J Automot. Technol. 9, 735–740 (2008). https://doi.org/10.1007/s12239-008-0087-5
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DOI: https://doi.org/10.1007/s12239-008-0087-5