Study on flame height of double fire sources in tunnel under longitudinal ventilation

Fire Science and Technology ›› 2023, Vol. 42 ›› Issue (3): 334-338.

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Study on flame height of double fire sources in tunnel under longitudinal ventilation

Wang Pengfei1, Zhang Jinguang2, Wang Dong3, Zhou Shanxin4, Ma Yuxuan4, Chen Longfei4

（1. Tianjin Fire Science and Technology Research Institute of MEM, Tianjin 300381, China; 2. State Gird Henan Electric Power Ultra-high Voltage Company, Henan Zhengzhou 450052, China; 3. State Gird Henan Electric Power Research, Henan Zhengzhou 450052, China; 4. Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University， Sichuan Chengdu 610031, China）

Online:2023-03-15 Published:2023-03-15

Abstract

Abstract: Abstract: A 1/5 reduced-scale tunnel model is established using FDS numerical simulation. Through theoretical analysis, the influence of longitudinal ventilation velocity, fire source spacing and heat release rate of fire source on the flame height of double fire sources is studied. The results show that the average flame height and maximum flame height increase with the heat release rate increasing from 60 kW to 120 kW. And, the average flame height and maximum flame height decrease with the increase of longitudinal ventilation velocity (from 0.2 m/s to 0.4 m/s) or the increase of fire source spacing (from 0 m to 0.6 m). Considering the influence of Richardson's number and longitudinal ventilation velocity coefficient, this paper establishes the dimensionless prediction models for the relationship of the merged flame height of double fire sources and fire source spacing.

Key words: Key words: double fire sources, fire source spacing, longitudinal ventilation, flame height

Wang Pengfei, Zhang Jinguang, Wang Dong, Zhou Shanxin, Ma Yuxuan, Chen Longfei. Study on flame height of double fire sources in tunnel under longitudinal ventilation[J]. Fire Science and Technology, 2023, 42(3): 334-338.

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Study on flame height of double fire sources in tunnel under longitudinal ventilation

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