Methodology to Achieve Pseudo 1-D Combustion System of Polymeric Materials Using Low-Pressured Technique
Methodology to Achieve Pseudo 1-D Combustion System of Polymeric Materials Using Low-Pressured Technique
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DOI：
10.1007/s10694-019-00877-x
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发表时间：
2020-01
期刊：
影响因子：
3.4
通讯作者：
Tatsuya Migita;Takumi Yamahata;Patrick Strempfl;T. Matsuoka;Y. Nakamura
中科院分区：
文献类型：
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作者：
Tatsuya Migita;Takumi Yamahata;Patrick Strempfl;T. Matsuoka;Y. Nakamura
本文提供了实现特定聚合物材料的伪1-D燃烧系统而没有任何复杂的物理效应（例如，变形、气泡破裂等）通过采用具有燃料分层方法的低压技术。本研究所采用的压力水平低至20 kPa，试样尺寸为亚毫米级。通过利用压力建模来保持小的Grashof数，重力效应在低压下相对最小化以模拟理想的1-D燃烧过程。在陶瓷球（由薄SiC纤维悬浮）上形成的熔融PMMA层用作燃烧试样以实现本研究的目的。结果表明，当环境氧浓度为20%和30%时，压力足够低（~ 20 kPa）时，在整个燃烧过程中均成功地获得了球形火焰，没有任何明显的气泡破裂。在点火后阶段，燃烧过程符合准稳态规律。直接比较燃烧速率，K，在本研究中得到的和在微重力下得到的，确保本方法是有效的模拟一个理想的一维燃烧系统，就像一个可以在微重力下实现，而不需要微重力设施。
This paper provides the methodology to achieve pseudo 1-D combustion system of specific polymeric materials without any complex physical effect (e.g., deformation, bubble bursting etc.) by adopting a low pressure technique with a fuel-layered approach. The adopted pressure level in this study is as low as 20 kPa and the size of the specimen is sub-millimeter scale. By utilizing pressure modeling to keep the Grashof number small, the gravity effect is relatively minimized at low pressure to mimic an ideal 1-D combustion process. A molten PMMA layer formed over a ceramic ball (suspended by thin SiC fiber) was used as the burning specimen to fulfil the purpose of this study. Results show that a spherical flame without any apparent bubble bursting is successfully achieved during the entire burning event when the pressure is sufficiently lower (~ 20 kPa) for both 20% and 30% ambient oxygen concentration. A well-knownd-square law and pseudo steady burning process is confirmed at the post-ignition stage. Direct comparison of burning rate,K, between what was obtained in this study and that obtained under microgravity ensures that the present methodology is effective to simulate an ideal 1-D combustion system, just like one that can be achieved in microgravity, without the need for microgravity facilities.