Flame Spread of Fuel Droplet Array in a Fuel Vapor-Air Mixture
- Paper number
IAC-05-A2.7.01
- Author
Mr. Yusuke Suganuma, Nihon University, Japan
- Coauthor
Dr. Hiroshi Nomura, Nihon University, Japan
- Coauthor
Dr. Yasushige Ujiie, Nihon University, Japan
- Coauthor
Dr. Masao Kikuchi, Japan Aerospace Exploration Agency (JAXA), Japan
- Coauthor
Mr. Shin Yamamoto, Japan Aerospace Exploration Agency (JAXA), Japan
- Coauthor
Prof. Shinichi Yoda, Japan Aerospace Exploration Agency (JAXA)/ISAS, Japan
- Coauthor
Prof. Masato Mikami, Yamaguchi University, Japan
- Year
2005
- Abstract
Flame spread of a fuel droplet array has been studied experimentally and numerically as a simple model of the droplet combustion in a spray flame. The purpose of this work is to examine the effect of fuel vapor concentration in an ambient gas on the flame spread. Since fuel droplet of about one millimeter in diameter were employed for precise observation and easy handling of droplets, microgravity experiments were necessary to eliminate the effect of natural convection. Six fuel droplets were simultaneously generated in a line with six glass tubes of 40 µm in outer diameter. The generated droplets were hanged at the crossing points of X-shaped suspenders made of two silicon carbide lines of 14 µm in diameter. Fuel vapor-air mixture was filled in a high-temperature combustion chamber, at the bottom of which there is a slit with a shutter. After the shutter was opened, the droplet array was inserted into the high-temperature combustion chamber from the slit, and the droplet at the one end was ignited to initiate flame spread. Ambient temperature, gas equivalence ratio, droplet diameter, and droplet spacing were varied. The results of microgravity operation tests of the experimental apparatus and preliminary experiments under normal gravity conditions were reported. The experimental results were discussed as compared with the results of numerical simulation. Finally, flame spread behavior of a fuel droplet array at microgravity was predicted.
- Abstract document
- Manuscript document
IAC-05-A2.7.01.pdf (🔒 authorized access only).
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