U型电缆不同弯曲形式和角度燃烧特性的实验研究

IF 3 3区 农林科学 Q2 ECOLOGY Fire-Switzerland Pub Date : 2023-09-06 DOI:10.3390/fire6090348
Changkun Chen, Wuhao Du, Tong Xu
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引用次数: 0

摘要

电缆在安装过程中通常会弯曲成u型,以方便穿越障碍物。u型电缆分为上行弯曲和下行弯曲两种。对上述不同弯曲形式和不同弯曲角度的u形电缆的燃烧特性进行了实验研究。将着火点设置在u型电缆的中间,测量并分析了其温度分布、火焰蔓延速率(FSR)、质量损失率(MLR)、火焰尺寸特性等。结果表明,FSR和MLR与弯曲角度呈正相关,其中弯曲角度为90°时FSR最高,接近6.51 cm/min,是弯曲角度为0°时的4倍。在UBM中,电缆火焰向未燃烧区域的热辐射和对流更为强烈,燃烧过程中出现“喷火现象”,导致FSR在短时间内急剧增加。而燃烧区向非燃烧区的热对流和辐射在DBM中减弱。同时,熔融的外护套(PE)会沿着电缆流动,加热并点燃DBM中未燃烧的区域。此外,与DBM相比,UBM的FSR、MLR和峰值温度都有所增加。最高火焰温度发生在UBD 90°,约为1023°C。
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Experimental Study on Combustion Behavior of U-Shaped Cables with Different Bending Forms and Angles
Cables are usually bent into a U-shape to cross obstacles during installation: this includes the upward-bending mode (UBM) and the downward-bending mode (DBM). An experimental study was conducted to investigate the combustion behavior of U-shaped cables with the above bending forms and different angles. The ignition point was set in the middle of the U-shaped cables and the temperature distribution, flame spread rate (FSR), mass loss rate (MLR), flame dimensional characteristics, etc. were measured and analyzed. The results showed that FSR and MLR are positively related to the bending angles, and the FSR is the highest in UBM 90°, close to 6.51 cm/min, which is four times higher than that in the bending angle 0° condition. In the UBM, the heat radiation and convection from the cable flame to the unburned region were more intense and the “eruptive fire phenomenon” occurred during the combustion process, leading to a sharp increase in the FSR in a short time. However, the thermal convection and radiation from the burning region to the unburned region were weakened in the DBM. Meanwhile, the molten outer sheath (PE) would flow along the cables, heating and igniting the unburned region in the DBM. In addition, the FSR, MLR, and peak temperature increased in the UBM compared to the DBM. The highest flame temperature occurred in UBD 90°, approximately 1023 °C.
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来源期刊
Fire-Switzerland
Fire-Switzerland Multiple-
CiteScore
3.10
自引率
15.60%
发文量
182
审稿时长
11 weeks
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