主管：中华人民共和国应急管理部
主办：应急管理部天津消防研究所
ISSN 1009-0029  CN 12-1311/TU
消防科学与技术

消防科学与技术 ›› 2022, Vol. 41 ›› Issue (11): 1491-1496.

• • 上一篇    下一篇

堵塞效应下隧道火灾临界风速研究

赵香玲1，梅 华2，王丰仓1   

  1. (1. 陕西铁路工程职业技术学院，陕西 渭南 714000；2. 湖南工学院 土木与建筑工程学院，湖南 衡阳 421002)
  • 出版日期:2022-11-15 发布日期:2022-11-15
  • 作者简介:赵香玲（1988- ），女，陕西铁路工程职业技术学院讲师，硕士，主要从事桥梁与隧道工程方面的教学与科研工作，陕西省渭南市临蔚区解放路恒天首府，714000。
  • 基金资助:
    陕西铁路工程职业技术学院科研基金项目（KY2018-05）

Study on calculation of critical wind speed of tunnel fire under blocking effect

Zhao Xiangling1, Mei Hua2, Wang Fengcang1   

  1. (1. Shaanxi Railway Institute, Shaanxi Weinan 714000, China; 2. School of Civil and Architecture Engineering，Hunan Institute of Technology, Hunan Hengyang 421002, China)
  • Online:2022-11-15 Published:2022-11-15

摘要： 为获取更为准确的隧道火灾临界风速算法，考虑火源阻塞比φ1、火源上游处阻塞比φ2均为0、0.23、0.41、0.64，选取了1.6，3.2，9.3 kW三种火源热释放率，通过正交数值试验计算了48种阻塞工况的临界风速值，推导了单纯火源阻塞、单纯火源上游阻塞、火源与上游同时阻塞时临界风速无量纲修正算法。研究结果表明：无论是增加火源处阻塞比还是加大火源上游阻塞比，临界风速值都会逐步减小，火源处阻塞对临界风速的影响更大。火源热释放率增加，临界风速也不断增大。仅火源处阻塞时，临界风速与(1-φ1)2/3成正比。仅火源上游阻塞时，临界风速与(1-φ2)1/3成正比。火源与上游同时阻塞时，临界风速与(1-φ1)2/3(1-φ2)1/3成正比。

关键词: 隧道火灾, 临界风速, 堵塞效应, 数值计算

Abstract: In order to obtain a more accurate critical wind speed algorithm for tunnel fire, the fire source blocking ratio φ1 is considered in this study, blockage ratio upstream of fire source φ2 are set of 0, 0.23, 0.41 and 0.64, and the heat release rates of 1.6, 3.2 and 9.3 kW fire sources are selected. The critical wind speed values under 48 blocking conditions are calculated through orthogonal numerical experiments. The dimensionless correction algorithm of critical wind speed under simple fire source blocking, simple fire source upstream blocking and simultaneous blocking of fire source and upstream is deduced. The results show that whether the blockage ratio at the fire source is increased or the blockage ratio upstream of the fire source is increased, the critical wind speed will gradually decrease, and the blockage at the fire source has a greater impact on the critical wind speed. As the heat release rate of fire source increases, the critical wind speed will also increase. When only the fire source is blocked, the critical wind speed is proportionate?to (1-φ1)2/3. When only the upstream of the fire source is blocked, the critical wind speed is proportionate?to (1-φ2)1/3. When the fire source and upstream are blocked at the same time, the critical wind speed is proportionate?to (1-φ1)2/3(1-φ2) 1/3.

Key words: tunnel fire, critical wind speed, blocking effect, numerical calculation