A Study on Combustion Processes of Emulsion Droplet Array utilizing Microgravity Conditions.
| Project/Area Number |
14550184
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Thermal engineering
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| Research Institution | Ehime University |
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Principal Investigator |
YAMASAKI Hiroshi Ehime University, Faculty of Education, Professor, 教育学部, 教授 (80182476)
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| Project Period (FY) |
2002 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2003: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2002: ¥2,300,000 (Direct Cost: ¥2,300,000)
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| Keywords | Droplet Combustion / Emulsion / Droplet Array / Microgravity / Microexplosion / Weibull Distribustion / ワイブル分布 / 燃焼 / 干渉燃焼 |
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| Research Abstract |
Experimental study has been conducted to reveal the interactive effects on the occurrences of micro-explosion in burning emulsion droplet array. The five tips of quartz fibers were arranged on a straight line at regular intervals. An igniter used in this study was 100 mm length of a horizontal electrical heated coil. The electrical preheated igniter moves quickly to just below the droplet array. This has resulted that an error of ignition timing of each droplet is less than 1 frame. The igniter moves away to avoid interference with the flame after ignition occurred. The behavior of the emulsion droplets burning in the droplet array is recorded by using a digital video camera. The oil-in-water emulsions consisted of the base fuel of n-dodecane or n-hexadecane and water were tested after degasification. The distribution function of the waiting time for the onset of micro-explosion of emulsion droplets was obtained using the Weibull statistical analysis. The combustion experiments were carried out under normal gravity and microgravity conditions. The effects of the droplet spacing, initial water contents on the distribution function of waiting time and the rate of micro-explosion were examined. Additional experiments were conducted of the micro-explosion of an emulsion droplet arranged in pure fuel droplet array in order to elucidate the aerodynamic effect on disintegration of pure fuel droplets caused by micro-explosion of their neighboring emulsion droplets. The results show that the interactive occurrence of micro-explosion exists in burning emulsion droplet array. It is also concluded that the waiting time for the onset of micro-explosion in emulsion droplet array is correlated with the Weibull distribution, which is classified to the early failure type. The rate of interactive micro-explosion decreases with the lapse of time and with an increase of droplet spacing.
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Report
(3 results)
Research Products
(3 results)
