Ignition and flame spread over thermal aging electrical wires in subatmospheric pressure
Ignition and flame spread over thermal aging electrical wires in subatmospheric pressure
复制标题
低于大气压下热老化电线的着火和火焰蔓延
DOI：
10.1177/0892705719866868
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发表时间：
2019-08
影响因子：
3.3
通讯作者：
Zhang Yongming
中科院分区：
文献类型：
--
作者：
Zhang Yue;Fang Jun;Wang Jingwu;Zhao Luyao;Zhang Yongming
热老化通过改变聚合物的动力学参数来影响聚合物的着火和火焰传播过程。在该实验中使用具有0.15mm厚度的聚乙烯（PE），其由0.5mm直径的铜芯绝缘。在不同的温度和加热时间下对PE进行预热。在130°C下热老化30和200 h的电线显示出更高的结晶度和热解温度。热重分析和差示扫描量热测试结果表明，在150°C下热老化30和200 h后，丝材的结晶度和热解温度均有所下降。点火试验结果表明，点火延迟期随压力呈“U”型变化。在低压区，化学动力学控制着火延迟期，而在高压区，传热控制着火延迟期。结晶度越高、热解温度越高，化学动力学控制的区域越大。火焰蔓延实验结果表明，结晶度和热解温度较低的线材，火焰面积更多地依赖于火焰长度，而结晶度较高、热解温度较高的线材，火焰面积更多地依赖于火焰高度。
Thermal aging affects polymer ignition and flame spread process by changing the polymer kinetic parameters. Polyethylene (PE) with 0.15 mm thickness insulated by copper core of 0.5 mm diameter was used in this experiment. The PE was preheated under different temperature and heating time. Wires which have experienced thermal aging at 130°C for 30 and 200 h display higher crystallinity and pyrolysis temperature. However, the crystallinity and pyrolysis temperature decrease of wires, which experienced thermal aging at 150°C for 30 and 200 h by the results of thermogravimetric analysis and differential scanning calorimetry tests. The ignition experiment results highlight the ignition delay exhibiting “U” type with pressure. Chemical kinetics controls the ignition delay in lower pressure region, and the heat transfer controls the ignition delay in higher pressure region. The region controlled by chemical kinetics is larger for the wire with higher crystallinity and pyrolysis temperature. The flame spread experiment results show that the flame area relays more on flame length for the wires with lower crystallinity and pyrolysis temperatures, while wires with greater crystallinity and higher pyrolysis temperature depend more on flame height.
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影响因子：
3.1
作者：
Linteris, G. T.;Rafferty, I. P.
通讯作者：
Rafferty, I. P.
影响因子：
4.2
作者：
Rwj Westerhout;J. Waanders;J. Kuipers;V. Swaaij
通讯作者：
Rwj Westerhout;J. Waanders;J. Kuipers;V. Swaaij
影响因子：
4.4
作者：
Burke, Michael P.;Chaos, Marcos;Ju, Yiguang
通讯作者：
Ju, Yiguang
影响因子：
4.6
作者：
A. Włochowicz;M. Eder
通讯作者：
A. Włochowicz;M. Eder
DOI：
--
发表时间：
2008
期刊：
--
影响因子：
--
作者：
L. Boukezzi;A. Boubakeur;C. Laurent;M. Lallouani
通讯作者：
L. Boukezzi;A. Boubakeur;C. Laurent;M. Lallouani