L型电缆廊道火灾温度场及烟气蔓延模拟  

Temperature field and smoke flow of fire in L-type cable tunnel

作　　者：严恩泽 雷蕾[1] 

机构地区：[1]中国人民武装警察部队学院,河北廊坊065000

出　　处：《消防科学与技术》2018年第1期37-41,共5页Fire Science and Technology

基　　金：公安部技术研究计划项目(面上项目)(2015JSYJC24);北京市科技计划项目(Z171100000517007)

摘　　要：通过对L型电缆廊道火灾温度场及烟气蔓延的数值模拟,研究不同位置起火情况下温度分布特性和烟气层厚度的变化规律。2段15.0 m×2.5 m×3.0 m的电缆廊道呈90°连接,两侧布置结构为8层的电缆桥架,桥架宽0.6 m,层间距0.2 m。通过抽取拐点温度和烟气层厚度的数据信息,分析火源高度和纵向风速对L型廊道拐角结构烟气蔓延的影响。使拐点烟气层厚度最大的风速约为1.0~1.1 m/s。结合烟气流场的模拟结果,指出L型廊道拐点处存在明显的"蓄烟效应",并有增大火灾的趋势。Based on the numerical simulation of fire temperature field and smoke flow of fire in L-type cable tunnel, the variation law of fire temperature field and smoke thickness was studied. The two cable tunnels of 15.0 m × 2.5 m × 3.0 m were connected vertically with 8 layers of cable trays on both sides. The width of cable tray was 0.6 m and the distance between the trays was 0.2 m. By analyzing the data of inflection point temperature and the thickness of smoke layer, the influence of fire source height and longitudinal wind speed on the flue gas spread of corners of corridor were analyzed. The wind speed of 1.0-1.1 m/s led to the biggest thickness of smoke layer at inflection point. Combining with the above research results, there was obvious ＂smoke accumulating effect＂ at the inflection point, which was a tendency to increase the fire.

关 键 词：L型结构 电缆廊道 蓄烟效应 火源高度 纵向风速 

分 类 号：X913.4[环境科学与工程—安全科学] TK121[动力工程及工程热物理—工程热物理]