Observation of Interaction between a Spreading Flame and Movable Droplets using Microgravity Environment of “KIBO”

DOI:10.15011//jasma.36.360304
Int. J. Microgravity Sci. Appl. 2019p360304
Author
H. NOMURA, Y. SUGANUMA, M. MIKAMI and M. KIKUCHI
Organization
College of Industrial Technology, Nihon University, Graduate School of Science and Technology for Innovation, Yamaguchi University, Japan Aerospace Exploration Agency
Abstract
In “KIBO” of the International Space Station, microgravity combustion experiments of a fuel droplet array were performed to investigate the interaction between flame-spread and droplet motion. The fuel droplet array consisted of 2-4 fixed droplets and movable droplets (up to 16 droplets) and was suspended on a straight SiC fiber, which enabled the movable droplets to move in the fiber direction. The initial droplet diameter of a droplet array was 1.0 mm for all tests. As a liquid fuel, n-decane was employed. The first fixed-droplet was ignited by a hot wire to initiate flame-spread along a fuel droplet array. Sequential direct images and backlit images of the spreading flame and the droplet array were taken alternatively during flame-spread. A movable droplet was accelerated by the spreading flame and moved away from the neighboring burning droplet. Termination of flame-spread due to droplet motion and droplet coalescence was observed. Flame spread behavior was categorized into four typical patterns. Parameters which determine flame-spread pattern was discussed.
Keyword(s)
Flame spread, Droplet array, Droplet motion, Spray combustion, Microgravity experiment
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Received 9 May 2019, accepted 3 July 2019, published 31 July 2019

© The Japan Society of Microgravity Applicaiton

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