Experimental investigation of pool fire behavior to different tunnel-end ventilation opening areas by sealing

Chen, Changkun; Xiao, Huang; Wang, Nannan; Shi, Congling; Zhu, Cong-xiang; Liu, Xuanya

doi:10.1016/j.tust.2017.01.001

Cited by 89 publications

(13 citation statements)

References 30 publications

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“…Experimental data were compared with previous studies by Ingason and Li, 6 Alpert, 23 Heskestad and Hamada, 26 Li and Ingason, 14 Chen et al, 24 and Tang et al 16 In this case, the situation of other researchers is not accurate. Figures 14 and 15 give a comparison of the maximum temperatures under the ceiling.…”

Section: Model Validationmentioning

confidence: 98%

Experimental and numerical study of maximum ceiling temperature in a tunnel

Bai

2019

Advances in Mechanical Engineering

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Maximum ceiling temperatures in a tunnel with different ventilation velocities with three heat release fires are studied experimentally and theoretically. This article investigates the ventilation velocity effects on maximum ceiling temperature combustible materials around ignition source in tunnel fires. Several fire experimental tests are conducted with longitudinal ventilation velocity changes in a small-scale tunnel (23 m in length, 2 m in width, and 0.98 m in height), where three heat release fires (237, 340, and 567 kW) and their corresponding values in the real tunnel are 20, 30, and 50 MW, respectively. This article modifies the current temperature prediction model taking the ignition materials near the fire source into account in tunnels. Results show that the ceiling maximum temperature increases, corresponding to the burn time when other experimental conditions remain unchanged for a given fire heat level source. The ceiling temperature reduces quickly when the ventilation velocity is increased from 0.5 to 2.0 m/s. Moreover, this article proposes an equation that can be used to estimate the ceiling maximum temperature variation value with three heat release fires in tunnels. Finally, experimental results are also compared with the tunnel ceiling temperature attenuation equations established by Alpert, Heskestad, and Ingason. The equation proposed in this article appears to provide better estimates of ceiling temperature variation than the Kurioka model developed in their scaled experiments. The prediction agrees well with the experimental and measured data by the modified equations of this article.

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Section: Model Validationmentioning

confidence: 98%

Experimental and numerical study of maximum ceiling temperature in a tunnel

Bai

2019

Advances in Mechanical Engineering

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“…Entrance. Chen et al [10] studied the ceiling temperature inside tunnel varies versus sealing ratio, which is primarily due to the comprehensive effect between the heat loss by the hot smoke flowing out of tunnel entrance and the heat produced by combustion significantly related to ventilation, and both the above factors are related to the open area of tunnel entrance. Huang et al [11] proposed ceiling temperature increases with sealing ratio due to the heat accumulation inside the tunnel when the heat release rate is relatively small.…”

Section: Firefighting Such As Water Mist Screens or Sealingmentioning

confidence: 99%

Study on Underground Utility Tunnel Fire Characteristics under Sealing and Ventilation Conditions

Hong-tao

Zhao

2020

Advances in Civil Engineering

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With the development of the underground utility tunnel in China, the safety evaluation during facility operation inside tunnels is increasingly important after construction. In contrast to fixed fire source in the traffic tunnel, the fire characteristics of the electric cable compartment of the utility tunnel with different ventilation modes are studied. Firstly, the thermal physical parameters of cable material are determined by experiment and numerical simulation. Different fire sealing and ventilation conditions are established according to the practical utility tunnel engineering in FDS. The maximum temperature and smoke gas concentrations are obtained, as well as the heat release rate. The results show that the utility tunnel fire has obvious differences compared with road tunnel fire, where the maximum ceiling temperature and the distributions of smoke is related to fire sealing and ventilation mode. Some suggestions related to evaluation and firefighting are provided for practical purposes.

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“…Fires can cause traffic congestion and lead to serious casualties. [8][9][10][11] Many tunnel fire cases show that the toxic smoke is the main cause of casualties 12-14 ;…”

Section: Introductionmentioning

confidence: 99%

“…Fires can cause traffic congestion and lead to serious casualties. [8][9][10][11] Many tunnel fire cases show that the toxic smoke is the main cause of casualties 12-14 ;thus, how to effectively control the smoke is an important issue for emergency ventilation and smoke exhaust in tunnel fires. [15][16][17][18] There are mainly two kinds of ventilation systems in tunnels, that is, natural ventilation and mechanical ventilation with jet fans.…”

mentioning

confidence: 99%

Study on the heat exhaust coefficient and smoke flow characteristics under lateral smoke exhaust in tunnel fires

Liu

et al. 2019

Fire and Materials

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Summary The heat exhaust coefficient and smoke flow characteristics under lateral smoke exhaust in tunnel fires were studied in this paper. Through the dimensional analysis, the dimensionless relationship between the heat exhaust coefficient, heat release rate, exhaust vent size, and exhaust velocity was obtained. In addition, this paper also studied the effect of the lateral exhaust vent on the smoke flow field. Results showed that the lateral smoke exhaust caused strong air entrainment on the downstream of the exhaust vent and boundary layer separation on the upstream of the exhaust vent. As the exhaust velocity increased, the degree of air entrainment gradually increased, and the smoke layer near the exhaust vent gradually became thinning and plug‐holing phenomenon occurred; meanwhile, the boundary layer separation would be suppressed or disappear, but the increase of the heat release rate would enhance the boundary layer separation. As the exhaust vent got narrower, the air entrainment downstream of the exhaust vent was reduced, and the boundary layer separation also got weaker.

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Experimental investigation of pool fire behavior to different tunnel-end ventilation opening areas by sealing

Cited by 89 publications

References 30 publications

Experimental and numerical study of maximum ceiling temperature in a tunnel

Experimental and numerical study of maximum ceiling temperature in a tunnel

Study on Underground Utility Tunnel Fire Characteristics under Sealing and Ventilation Conditions

Study on the heat exhaust coefficient and smoke flow characteristics under lateral smoke exhaust in tunnel fires

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