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Erschienen in: Fire Technology 1/2020

25.04.2019

Effect of Ignition Condition on the Extinction Limit for Opposed Flame Spread Over Electrical Wires in Microgravity

verfasst von: Masashi Nagachi, Fumiya Mitsui, Jean-Marie Citerne, Hugo Dutilleul, Augustin Guibaud, Grunde Jomaas, Guillaume Legros, Nozomu Hashimoto, Osamu Fujita

Erschienen in: Fire Technology | Ausgabe 1/2020

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Abstract

Flame spread over wire insulation plays a crucial role in spacecraft fire safety. To quantify the effect of the initial ignition condition on the limiting oxygen concentration (LOC) of spreading flame over wire insulation, opposed flow flame spread experiments with wire insulation were conducted in microgravity (parabolic flights). Both ignition power (32.7 W to 71.8 W) and heating time (5 s to 15 s) were varied for an external flow of 100 mm/s. The sample wires were made of polyethylene-coated nickel-chrome (NiCr) and Copper (Cu), respectively, both with inner core diameter of 0.50 mm and insulation thickness of 0.30 mm. A 0.50 mm diameter coiled Kanthal wire wrapped around the sample wire 6 times with 8 mm length was used as the igniter. The experimental results show that the LOC gradually decreases as the ignition power or heating time increases and eventually it reaches a constant value. Also, the effect of ignition condition on LOC was more pronounced for Cu wires than for NiCr wires. The variation range of LOC in the tested ignition condition in microgravity was larger than that of horizontal flame spread in normal gravity. This conclusion can have implication for future experiment in the International Space Station to avoid the wrong LOC value because of the insufficient initial ignition energy and will eventually lead to an improved fire safety in spacecrafts.

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Literatur
25.
Zurück zum Zitat Mitsui F, Nagachi M, Citerne J, Dutilleul H, Guibaud A, Jomass G, Legros G, Hashimoto N, Fujita O (2017) Effect of the ignition method on the extinction limit for a flame spreading over electric wire insulation. In: 47th International conference on environmental systems, p 155 Mitsui F, Nagachi M, Citerne J, Dutilleul H, Guibaud A, Jomass G, Legros G, Hashimoto N, Fujita O (2017) Effect of the ignition method on the extinction limit for a flame spreading over electric wire insulation. In: 47th International conference on environmental systems, p 155
27.
Zurück zum Zitat Nagachi M, Mitsui F, Citerne J, Dutilleul H, Guibaud A, Jomaas G, Legros G, Hashimoto N, Fujita O (2017) Effect of flow direction on the extinction limit for flame spread over wire insulation in microgravity. In: 47th International conference on environmental systems, p 244 Nagachi M, Mitsui F, Citerne J, Dutilleul H, Guibaud A, Jomaas G, Legros G, Hashimoto N, Fujita O (2017) Effect of flow direction on the extinction limit for flame spread over wire insulation in microgravity. In: 47th International conference on environmental systems, p 244
Metadaten
Titel
Effect of Ignition Condition on the Extinction Limit for Opposed Flame Spread Over Electrical Wires in Microgravity
verfasst von
Masashi Nagachi
Fumiya Mitsui
Jean-Marie Citerne
Hugo Dutilleul
Augustin Guibaud
Grunde Jomaas
Guillaume Legros
Nozomu Hashimoto
Osamu Fujita
Publikationsdatum
25.04.2019
Verlag
Springer US
Erschienen in
Fire Technology / Ausgabe 1/2020
Print ISSN: 0015-2684
Elektronische ISSN: 1572-8099
DOI
https://doi.org/10.1007/s10694-019-00860-6

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