Study on air entrainment coefficient of one-dimensional horizontal movement stage of tunnel fire smoke in top central exhaust

Xuepeng Jiang*, Meijia Liu, Jie Wang, Kaiyuan Li

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

18 Citations (Scopus)

Abstract

When tunnel fire smoke is exhausted using a top central exhausting system, the air entrainment at the smoke-air interface has a significant effect on the overall mass flux. Using theoretical analysis, the air entrainment coefficient in one-dimensional horizontal smoke movement stage in central exhausting was obtained. Both heat release rate and smoke extraction rate have effects on the horizontal entrainment coefficient. The experimental results show that the entrainment coefficient in central exhausting is between 0.01 and 0.03 and the horizontal entrainment coefficient increases to 0.0181 with increasing heat release rate and becomes relatively stable afterwards. The entrainment coefficient increases with the smoke extraction rate increasing as the smoke extraction process will enhance the smoke momentum in the tunnel.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalTUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
Volume60
DOIs
Publication statusPublished - 1 Nov 2016
MoE publication typeA1 Journal article-refereed

Keywords

  • Bench-scale model experiment
  • Horizontal entrainment coefficient
  • Smoke
  • Top central exhaust
  • Tunnel

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