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SLICE stands for Structure and Liftoff In Combustion E i t d thi i t i ti tExperiment and this experiment investigates microgravity’s effect on flames
• The principal investigator in this experiment is Marshall B. Long of Yale University y
• The co-investigators include Mitchell D. Smooke from Yale University, Fumiaki Takahashi from the National Center for Space Exploration Research, and D i P St k f th GlDennis P. Stocker from the Glenn Research Center
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• What’s so important about researching flames in different environments? It’s not going to do much right?
• Actually it’s pretty important. The results from this experiment can help improve technologies in the combustion department which aim to eliminate pollution and increase burning efficiency in engines
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• Scientists are trying to characterize the structure of flames, especially at its base, in order to determine the function of the fuel they are burning, the burner di t d th fl ditidiameter, and the flow conditions
• Scienctists also determine the flames lift off velocity which basically means the direction the flame flows due to outside influences and how the flame stabilizes itself after being affected
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Well Sounds Like it’s Ready Right?Well Sounds Like it’s Ready Right?
• Not Quite! SLICE was first put into action during ISS Expeditions 29 and 30
Well Sounds Like it s Ready Right? Well Sounds Like it s Ready Right?
• This experiment wasn’t designed to have any space applications but it’s findings may pave the way for improvements in combustion devices
• SLICE’s applications on Earth include reduced time and cost in the• SLICE s applications on Earth include reduced time and cost in the development of common combustion devices such as engines and furnaces
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• A flame is ignited in a low speed flow duct and photographed
• The fuel flow or air velocity is adjusted to understand its affect on flame structure and liftoff
• Experimental parameters include the gaseous fuel and th di t f th i lthe diameter of the circular burner tube
• Flame measurements include• Flame measurements include the structure (ie. Size and shape), soot temperature, soot volume fraction andsoot volume fraction, and thermal radiation
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The Results of Hard Work• At moderate flame conditions, the experimental and computation results are
in agreement
• However, this agreement breaks down when there is high soot production and when the fuel is highly diluted
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Well What Now?• Now scientists are working on improving computational techniques in order
to test a wider variety of flames in a broader range of conditions
Well What Now?
• The future of advanced combustion technologies is underway and it won’t be long until we get our first glimpse of what SLICE is capable of
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