Experimental investigation on influence of different transverse fire locations on maximum smoke temperature under the tunnel ceiling

Ji, J.; Fan, Chuan; Wang, Zhong; Shen, Xiaobo; Sun, Jinhua

doi:10.1016/j.ijheatmasstransfer.2012.04.052

Cited by 284 publications

(56 citation statements)

References 19 publications

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“…The air entrainment rate is closely related to the fire plume temperature and the flame height [18,19] Here r is the stoichiometric air to fuel ratio, 3000 /   r h c kJ/kg [21], and P is the ambient pressure in KPa .…”

Section: Flame Height and Centerline Temperature Distributionmentioning

confidence: 99%

Experimental study on Jet-A pool fire at high altitude

Zhou¹,

Yao²,

Li³

et al. 2014

Fire Saf. Sci.

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For the further assessment on cargo fire hazard, full-scale Jet-A pool fire tests under the specifications of FAA Minimum performance standard (MPS) were conducted in sea-level Hefei and high-altitude Lhasa. A square insulation board (1.2m×1.2m) was place upon the fuel pan to simulate the effect of ceiling on fire plume. The experimental results indicates that the mass burning rate is proportional to the 2/3 power of the ambient pressure, in accordance with the theoretical prediction for convection-dominant fires. The analysis shows that the flame height increases slightly at high altitude. At higher altitude, the centerline temperature decreases in the flame region but increases in the intermittent region. The addition of ceiling increases the mass burning rate and the centerline temperature, although the effect on centerline temperature is observed to be weaker in Lhasa. KEYWORDS:

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Section: Flame Height and Centerline Temperature Distributionmentioning

confidence: 99%

Experimental study on Jet-A pool fire at high altitude

Zhou¹,

Yao²,

Li³

et al. 2014

Fire Saf. Sci.

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“…Based on the data obtained from the experiment, HRR of the pool fire in the room could be acquired by using Equation (24), the virtual fire HRR and the distance between virtual fire and corridor ceiling could be calculated through Equations (10) and (11), and based on the development of virtual fire HRR changing with time, we could obtain the maximum virtual fire HRR. The dimensionless virtual fire HRR could be obtained through dimensional analysis as per Equation (14). Table 1 lists the fire and corridor parameters of all the experiments; moreover, the virtual fire HRR and the dimensionless virtual fire HRR are also listed in Table 1.…”

Section: Methodsmentioning

confidence: 99%

“…Hu et al [10][11][12] conducted a series of full-scale experiments to investigate the smoke temperature distribution, velocity, and maximum temperature along the corridor. Ji et al [13][14][15][16] conducted reduced-scale experiments, and obtained a simplified calculation to predict the maximum temperature under the ceiling, and investigated the transverse smoke temperature distribution in road tunnel fires. Moreover, they also analyzed the influence of different transverse fire locations and sidewall restriction on the maximum ceiling smoke temperature.…”

Section: Introductionmentioning

confidence: 99%

Scaled Experimental Study on Maximum Smoke Temperature along Corridors Subject to Room Fires

et al. 2015

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Abstract:In room-corridor building geometry, the corridor smoke temperature is of great importance to fire protection engineering as indoor fires occur. Theoretical analysis and a set of reduced-scale model experiments were performed, and a virtual fire model was proposed, to investigate the correlations between the maximum smoke temperature in corridors and the smoke temperature in rooms. The results show that the dimensionless virtual fire heat release rate (HRR) is characterized by quadratic-polynomial of the dimensionless smoke temperature in fire rooms. The dimensionless distance from a virtual fire source to the corridor ceiling varies linearly with the dimensionless smoke temperature in a room. Results of multiple regression indicate that, at the impingement area of virtual fire, the dimensionless maximum smoke temperature in corridors is only related to the dimensionless virtual fire HRR; in the non-impingement area of a virtual fire, the dimensionless maximum smoke temperature in corridors is a function of the dimensionless virtual fire HRR and dimensionless longitude distance. The viscosity and conduction exhibit an insignificant impact on the maximum temperature in the corridor. Through replacing the parameters of virtual fire with the dimensionless smoke temperature in fire rooms, the correlations between dimensionless maximum temperature in corridors and the dimensionless smoke temperature in fire rooms were proposed. OPEN ACCESSSustainability 2015, 7 11191

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“…For example, the Funicular tunnel in Austria in 2000 resulting in the death of 155 persons [4]; the subway tunnel in Daegu Korea in 2003 caused 198 victims [5]. Statistics have shown that more than 85% of the casualties in the fires are caused by the smoke [6,7]. To achieve controlling smoke and protecting occupants, it is necessary to install the mechanical ventilation system in a tunnel.…”

Section: Introductionmentioning

confidence: 99%

A Study of the Critical Velocity of Smoke Bifurcation Flow in Tunnel with Longitudinal Ventilation

et al. 2016

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Small longitudinal velocity cannot prevent backlayering in tunnel fire, while excessive longitudinal velocity will destroy stratification of smoke layer and lead to bifurcation flow. As smoke bifurcation flow proceeds, the longitudinal flow is divided into two streams and flow along both sidewalls of the tunnel ceiling. The critical velocity of bifurcation flow is the minimum value at which bifurcation flow starts to occur. To investigate the critical velocity of bifurcation flow, experiments and CFD simulations were conducted. Experiment was carried out in a reduced-scale tunnel, which is 8 m long, 1 m wide and 0.5 m high. The numerical research was performed using FDS. In simulation, the computational region of a tunnel is 200 m long, 10 m wide. The heat release rate (1 MW to 6 MW) and the height (4 m to 8 m) is changed in the 30 simulation scenarios. Theoretical analysis showed that the dimensionless critical velocity of bifurcation flow only depends on the dimensionless heat release rates, and a mathematical equation is proposed. The reduced-scale experiments indicated that the critical velocity of bifurcation flow is 1.48 times that of critical velocity for preventing backlayering, and the coefficient is in agreement with CFD simulation. A Cross-sectional area of the tunnel (m 2 ) g Acceleration of gravity (m/s 2 ) U Ventilation velocity (m/s) _ Q Heat release rate (kW) u b Critical velocity of bifurcation flow (m/s) u c Critical velocity for preventing backlayering (m/s)

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Experimental investigation on influence of different transverse fire locations on maximum smoke temperature under the tunnel ceiling

Cited by 284 publications

References 19 publications

Experimental study on Jet-A pool fire at high altitude

Experimental study on Jet-A pool fire at high altitude

Scaled Experimental Study on Maximum Smoke Temperature along Corridors Subject to Room Fires

A Study of the Critical Velocity of Smoke Bifurcation Flow in Tunnel with Longitudinal Ventilation

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