防火封堵对隧道电缆影响的多场耦合仿真研究  

Multi-field Coupling Simulation Study of Influence on Cables in Tunnel with Firewall and Opened Fire Door

作　　者：李小潇 牛海清[1] 聂程 陈泽铭 刘刚[1] LI Xiaoxiao;NIU Haiqing;NIE Cheng;CHEN Zeming;LIU Gang(School of Electric Power Engineering,South China University of Technology,Guangzhou,Guangdong 510641,China;Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Guangzhou,Guangdong 510620,China)

机构地区：[1]华南理工大学电力学院,广东广州510641 [2]广东电网有限责任公司广州供电局,广东广州510620

出　　处：《广东电力》2022年第9期94-101,共8页Guangdong Electric Power

基　　金：国家重点实验开放基金项目(K-A2021.425)。

摘　　要：火灾是隧道集群敷设电缆线路最严重的事故,具有隐蔽性和延燃性,封堵是隧道电缆线路的重要防火措施。为此,研究防火封堵对正常运行隧道电缆线路的影响。首先建立隧道电缆的多物理场耦合仿真模型,通过实际测温及环流数据验证数学模型的正确性;对比分析防火封堵对隧道电缆线路温度分布及空气流速分布的影响。结果表明:防火封堵在导致热量积累的同时改变了隧道内的空气的流向和流速分布,形成高速气流和大范围涡流,改善了电缆周围的散热情况,使封堵处积累的热量能及时向轴向和周围传递;基于该隧道最大负荷日电流的计算条件,防火封堵可使电缆线路的最高温度降低7.24%。Fire is the most serious accident for cables laid in tunnel with invisibility and extensibility.Firewall and fire door are used to prevent cable fires.This paper studies the impact of firewall and opened fire door on tunnel cables in normal operation.Firstly,the multi-physics coupling model of the tunnel cables is established to verify the correctness by the actual temperature and circulation current measurement.The temperature distribution and air velocity distribution in the tunnel with firewall and opened fire door are compared with their distribution without fire-proof sealing under the same operating conditions.The result shows that firewall and opened fire door will accumulate heat and change the air flow direction and its velocity distribution inside the tunnel,accelerate the air and form large-scale air eddy,therefore improve the heat dissipation of the cables,leading to the accumulated heat be transferred along the axial and diffused in time.According to the annual maximum load of the tunnel cables,firewall and opened fire door can reduce the maximum temperature of cables by 7.24%.

关 键 词：防火封堵 隧道电缆 多场耦合 温度分布 流速分布 

分 类 号：TM726.4[电气工程—电力系统及自动化]