| 钟委,郭超杰,高子鹤,马文辉.通风对综合管廊内电缆燃烧及火蔓延过程影响的数值模拟研究[J].火灾科学,2023,32(3):144-150. |
| 通风对综合管廊内电缆燃烧及火蔓延过程影响的数值模拟研究 |
| Numerical simulation on the effect of ventilation on the combustion and fire spread process of cable in a utility tunnel |
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| DOI：10.3969/j.issn.1004-5309.2023.03.02 |
| 基金项目:国家自然科学基金项目(52076198);河南省优秀青年科学基金项目(222300420078);河南省青年人才托举工程项目(2022HYTP019) |
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| 中文关键词: 电缆火灾 通风 内热源 火蔓延 数值模拟 |
| 英文关键词:Cable fire Ventilation Internal heat source Fire spread Numerical simulation |
| 摘要点击次数: 166 |
| 全文下载次数: 708 |
| 中文摘要: |
| 综合管廊内电缆的火灾燃烧特性一直被国内外学者所关注,然而目前关于通风对电缆燃烧及火蔓延过程影响的研究相对较少。在通风系统的作用下,电缆内部及外部温度分布、热解气体浓度与无通风情况相比有很大的差异,电缆的燃烧及火蔓延过程将会更为复杂。为了研究通风作用下综合管廊内单根电缆的燃烧过程,采用FDS对15 kV交联聚乙烯绝缘铜芯电缆的火蔓延过程开展了数值模拟。通过分析不同风速条件下的电缆火焰形态、各层材料温度、火蔓延长度和热释放速率(HRR)曲线,详细研究了通风速度对综合管廊内单根电缆燃烧及火蔓延过程的影响。结果表明当通风速度不超过2 m/s时,通风能够促进电缆燃烧,电缆表面存在气相火焰,其火蔓延长度、热释放速率峰值等不断增加,此时综合管廊内火灾危险性不断增大;当风速大于等于3 m/s时,通风抑制了电缆燃烧,电缆的火蔓延长度、热释放速率峰值随之迅速降低,电缆PVC层、XLPE层温升的原因是线芯对绝缘材料的热传导,电缆的火灾危险性也随之减小。 |
| 英文摘要: |
| The fire combustion characteristics of cables in the comprehensive pipe gallery have always been of concern to fire safety. However, there is little research on the impact of ventilation on cable combustion and fire spread processes. Compared to the case of no ventilation, the combustion and fire spread process of cables subject to ventilation will be more complex. To study the combustion process of a single cable in the integrated pipe gallery under the action of ventilation, a numerical simulation of the fire spread process of a 15 kV XLPE insulated copper core cable was carried out using FDS. By analyzing the cable flame shape, material temperature of each layer, fire spread length and heat release rate (HRR) curve under different wind speeds, the effect of ventilation speed on the combustion and fire spread of a single cable in an integrated pipe gallery is studied in detail. Results show that when the ventilation speed does not exceed 2 m/s, the ventilation can promote the combustion of the cable. There is a gas-phase flame on the surface of the cable, and the fire spread length and the peak heat release rate continue to increase. The fire risk in the integrated pipe gallery continues to increase. When the wind speed is greater than or equal to 3 m/s, the ventilation suppresses the burning of the cable, with no gas phase flame on the surface of the cable, and the fire spread length and peak heat release rate of the cable decrease rapidly. The temperature rises of the PVC layer and XLPE layer of the cable is attributable to the heat conduction of the wire core to the insulating material, leading to the reduction of the fire hazard of the cable. |
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