Critical ventilation velocity for tunnel fires occurring near tunnel exits

Kuang Chung Tsai, Yee Ping Lee, Shin Ku Lee

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19 Citations (Scopus)


Ventilation is an effective method for controlling smoke during a tunnel fire. The critical ventilation velocity ucr is generally defined as the minimum velocity at which smoke is prevented from spreading against the longitudinal ventilation flow in tunnel fire situations. This study conducted small-scale experiments to investigate ucr for situations when tunnel fire occurs near tunnel exits. The model tunnel was 4 m long, 0.6 m wide and 0.6 m tall, and the fires were located at 0.5 m, 1.0 m and 1.5 m from the tunnel exit. 6.3×6.3 cm2 and 9.0×9.0 cm2 square asoline fuel pans were used as fire source. Results show that ucr decreases as the fire approaches the tunnel exit.

Original languageEnglish
Pages (from-to)556-557
Number of pages2
JournalFire Safety Journal
Issue number8
Publication statusPublished - 2011 Nov

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Safety, Risk, Reliability and Quality
  • Physics and Astronomy(all)

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