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 ›› 2021, Vol. 40 ›› Issue (11): 1599-1603.

• • 上一篇    下一篇

相向射流模式下竖井结构对烟气运动影响研究

陈圣元1,杨永斌1,肖志行2   

  1. (1.中国人民警察大学,河北 廊坊065000; 2.重庆市消防救援总队,重庆401121)
  • 出版日期:2021-11-15 发布日期:2021-11-15
  • 作者简介:陈圣元(1998-),男,湖北人,中国人民警察大学硕士研究生,主要从事隧道火灾研究,河北省廊坊市安次区西昌路220号,065000。
  • 基金资助:
    基金项目:河北省自然科学基金项目“公路隧道相向射流与竖井排烟组合模式下的火灾烟气分布特征研究”(E2021507005)

Study on the influence of shaft structure on smoke movement under the opposite jet mode

CHEN Sheng-yuan1, YANG Yong-bin1,XIAO Zhi-xing2   

  1. 1. China People's Police University, Hebei Langfang 065000, China; 2. Chongqing Fire and Rescue Brigade, Chong-qing 401121, China
  • Online:2021-11-15 Published:2021-11-15

摘要: 通过开展相似试验,研究了较优相向射流风速和不同火源功率条件下,竖井高度与横截面积对竖井内烟气运动模式的影响。结果表明:竖井高度与横截面积增大均会促使吸穿效应的发生;竖井横截面积越大,对应的临界竖井高度越小;求得试验条件下的Ri临界值为0.56,当Ri小于0.56时,竖井内主要发生边界层分离,当Ri大于0.56时,主要发生吸穿效应。

关键词: 公路隧道, 竖井排烟, 吸穿效应, 边界层分离, 相向射流

Abstract: The influence of shaft height and cross-sectional area on smoke movement pattern in shaft is studied by carrying out similar experiments under the conditions of better opposite jet velocity and different fire power. The experimental results show that the increase of shaft height and cross-sectional area will promote the occurrence of plug-holing; The larger the cross-sectional area of the shaft, the smaller the corresponding critical shaft height; The critical value of Ri under experimental conditions is 0.56. When Ri value is less than 0.56, boundary layer separation mainly occurs in the shaft, and when Ri value is greater than 0.56, plug-holing occurs.

Key words: highway tunnel, shaft smoke exhaust, plug-holing, boundary layer separation, opposing jet