Effect of flow direction on the extinction limit of spreading flame over wire insulation

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dc.creatorNagachi, Masashi
dc.creatorMitsui, Fumiya
dc.creatorKizawa, Koki
dc.creatorCiterne, Jean-Marie
dc.creatorDutilleul, Hugo
dc.creatorJomaas, Grunde
dc.creatorLegros, Guillaume
dc.creatorFujita, Osamu
dc.date.accessioned2016-07-28T18:07:16Z
dc.date.available2016-07-28T18:07:16Z
dc.date.issued2016-07-10
dc.descriptionJapan
dc.descriptionFrance
dc.descriptionDenmark
dc.descriptionHokkaido University
dc.descriptionUniversité Pierre-et-Marie Curie
dc.descriptionTechnical University of Denmark
dc.description509
dc.descriptionICES509: Fire Safety in Spacecraft and Enclosed Habitats
dc.descriptionVienna, Austria
dc.descriptionMasashi Nagachi, Hokkaido University, Japan
dc.descriptionFumiya Mitsui, Hokkaido University, Japan
dc.descriptionKoki Kizawa, Hokkaido University, Japan
dc.descriptionOsamu Fujita, Hokkaido University, Japan
dc.descriptionGuillaume Legros, Université Pierre-et-Marie Curie-Paris, France
dc.descriptionJean-Marie Citerne, Université Pierre-et-Marie Curie-Paris, France
dc.descriptionHugo Dutilleul, Université Pierre-et-Marie Curie-Paris, France
dc.descriptionGrunde Jomaas, Technical University of Denmark, Denmark
dc.descriptionThe 46th International Conference on Environmental Systems was held in Vienna, Austria, USA on 10 July 2016 through 14 July 2016.
dc.description.abstractFire safety is one of the most important issues for manned space mission, because a fire in a spacecraft may results in irreversible alteration of the crew's environment. Electric wire is a major cause of fire accidents in spacecraft. So, it is very important to study the flammability of electric wire under microgravity conditions. In this paper experimental works to determine Limiting Oxygen Concentration (LOC) of spreading flame over electric wire insulation have been carried out and the difference between the LOC in opposed and concurrent flows has been evidenced under both normal gravity (1G) and microgravity (μG). Polyethylene (PE) insulated Nickel-Chrome (NiCr) wires with inner core diameter (dc) of 0.50 mm and insulation thickness (dp) of 0.30 mm are examined with external flow velocity ranging from 50mm/s to 200mm/s. Microgravity environment is provided along parabolic flights onboard the French A310 airplane. Results show that with increasing external flow velocity, the LOC in 1G first decreases and then increases (“U” trend) for both of opposed and concurrent cases. On the opposite the LOC in μG monotonically decreases with increasing external flow velocity. Furthermore the LOC in μG is lower than that at 1G because natural convection is vanished. Comparing opposed and concurrent flows in 1G condition, the LOC tendencies following the modification of the flow velocity are very similar and the minimum value is almost the same. On the other hand, in μG condition, the LOC value is almost the same within the low flow velocity region for both flow directions, but the LOC for concurrent flow is about 2% smaller in Oxygen concentration than that for opposed flow within the high flow velocity region. This research is supported by Japan Space Exploration Agency (JAXA) under the project of FLARE and the Centre National d'Etudes Spatiales (CNES) under contract #130615.
dc.format.mimetypeapplication/pdf
dc.identifier.otherICES_2016_115
dc.identifier.urihttp://hdl.handle.net/2346/67534
dc.language.isoeng
dc.publisher46th International Conference on Environmental Systems
dc.subjectmicrogravity
dc.subjectextinction
dc.subjectflame spread
dc.subjectopposed flow
dc.subjectconcurrent flow
dc.subjectpolyethylene insulated wire
dc.subjectLimiting Oxygen Concentration (LOC)
dc.titleEffect of flow direction on the extinction limit of spreading flame over wire insulation
dc.typePresentation

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