Limiting Oxygen Concentration of Flame Resistant Material in Microgravity Environment
Limiting Oxygen Concentration of Flame Resistant Material in Microgravity Environment
复制标题
微重力环境下阻燃材料的极限氧浓度
DOI：
10.15011/jasma.34.3.340304
复制
发表时间：
2017
期刊：
影响因子：
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通讯作者：
Shuhei Takahashi
中科院分区：
文献类型：
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作者：
K. Maruta;K. Tsuboi;Shuhei Takahashi
国际空间站所用材料的防火安全测试是在正常重力下进行的。然而，在以往的研究中，火焰在微重力环境下可以在比正常重力环境下更低的氧气浓度下传播。因此，将地面可燃性试验结果用于微重力环境可能会引起火灾危险。在本文中，我们修改了我们以前的简化模型，包括边界层对材料的影响，并与抛物线飞行实验的结果进行了比较。此外，我们还报告了NOMEX的燃烧极限，典型的阻燃材料通过抛物线飞行实验获得，并将其与PMMA进行比较。结果表明，NOMEX的最低氧浓度（MdR）比常压下低约2%，MdR下的流速（10~ 20 cm/s）远大于PMMA的流速（6~ 10 cm/s）。利用NOMEX的强制吹脱试验数据，成功地预测了NOMEX的可燃极限特征。关键词：易燃性限值，NOMEX，水垢分析，微重力接收日期：2016年10月24日，接受日期：2017年6月15日，发布日期：2017年7月31日
Fire safety tests of materials used in the international space station have been conducted in normal gravity. However, in the previous researches, flame could spread in lower oxygen concentration in microgravity than in normal gravity. Therefore, it may cause fire hazard to use the ground-based flammability test results for microgravity environments. In the present paper, we modify our previous simplified model by including the effect of boundary layer on the material and compared the result with the parabolic flight experiment. Also we report the flammability limit of NOMEX, the typical flame resistant material obtained by parabolic flight experiments and compare it with PMMA. The results show that the minimum oxygen concentration (MLOC) of NOMEX was about 2% lower than that in normal gravity, and the flow velocity at MLOC is much larger (10~20cm/s) than that of PMMA (6~10cm/s). The feature of the flammability limit of NOMEX was successfully predicted by the modified model with the blow-off test data in forced flow. Keyword(s): Flammability limit, NOMEX, Scale analysis, Microgravity Received: 24 October 2016, Accepted 15 June 2017, Published 31 July 2017