Experimental study on the maximum temperature and flame extension length driven by strong plume in a longitudinal ventilated tunnel

Du, Sheng; Zhang, Yuchun; Xie, Wei; Zhang, Kejian

doi:10.1016/j.expthermflusci.2018.10.022

Cited by 30 publications

(4 citation statements)

References 18 publications

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“…Time series flame images of each condition were decompressed into frames and processed one by one for each video record. The image frame was firstly converted to gray scale image, then converted to binary image by the Otsu method, 23 and finally, the flame occurrence probability image was obtained. Each experiment repeated three times.…”

Section: Methodsmentioning

confidence: 99%

Study on the flame morphological characteristics of dual fire sources in tunnel under longitudinal ventilation

Zhang

Chen

et al. 2021

Fire and Materials

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Summary In this article, a small‐scale experiment (1:10) is used to study the flame morphology of the dual fire sources in the tunnel under longitudinal ventilation. The experimental results show that: (1) The flame height increases with the heat release rate of the fire source. When there is no wind, the flame height will increase as the fire source spacing increases. Under the effect of longitudinal ventilation, the flame height decreases first and then increases as the fire source spacing increases. (2) The flame inclination angle increases as the heat release rate of the fire source increases. When there is no wind, the flame inclination angle decreases with the increase of the fire source spacing. Under the effect of longitudinal ventilation, as the fire source spacing increases, the flame inclination angle decreases first and then increases, which is consistent with the variation law of the flame height with the fire source spacing. For the experimental conditions of smaller heat release rate of fire source and larger fire source spacing, the flame merged phenomenon gradually decreases.

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Section: Methodsmentioning

confidence: 99%

Study on the flame morphological characteristics of dual fire sources in tunnel under longitudinal ventilation

Zhang

Chen

et al. 2021

Fire and Materials

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“…Yao [30] 10 × 5 5-100 0.200 Ji [33] 10 × 5 5-15 0.200 Liang [36] 10 × 7 30 0.20 Ji [37] 10 × 5 3-15 0.167 Guo [38] 10 × 5 3-10 0.167…”

Section: Hrr (Mw) Mesh Sizes (M)mentioning

confidence: 99%

“…Taking the average value of each coefficient, the empirical formula of temperature attenuation under the tunnel ceiling with four smoke vents open can be obtained as follows: To highlight the difference between the single-side multi-point exhaust tunnel and the previous research results, we compared the temperature attenuation model in this paper with some existing temperature attenuation models. Ji et al [37] studied the effect of pressure and HRR on the temperature decay beneath the ceiling and found that the impact of pressure on temperature decay is very small, and the temperature attenuation conforms to the sum of two exponential attenuations: Ingason and Li [43] concluded that the temperature attenuation beneath the ceiling conforms to the sum of two exponential attenuations:…”

Section: Of 16mentioning

confidence: 99%

“…∆T(x)/∆T max = 0.40e 0.147( x x ) + 0.60e 2.17( x x ) (9) To highlight the difference between the single-side multi-point exhaust tunnel and the previous research results, we compared the temperature attenuation model in this paper with some existing temperature attenuation models. Ji et al [37] studied the effect of cally within 15%, as shown in Figure 10. The closer to the smoke vent, the greater the error between the numerical results and the prediction model, with the numerical calculation results slightly higher than the prediction model.…”

Section: Of 16mentioning

confidence: 99%

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Effect of Different Smoke Vent Layouts on Smoke and Temperature Distribution in Single-Side Multi-Point Exhaust Tunnel Fires: A Case Study

Tao

Zeng

2022

Fire

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In this paper, a numerical model verified by a 1:10 small-scale model test was used to study the effect of different smoke vent layouts on fire characteristics and smoke exhaust efficiency. The results show that the total smoke spread length is shortest when four smoke vents are opened near the fire source. If there are more than four smoke vents, some of them will only inhale fresh air rather than smoke. More seriously, some smoke vents will promote the spread of toxic smoke farther. Under different smoke vent layout schemes, the maximum temperature shows the same change trend with the increase in smoke exhaust volume (first increasing and then decreasing). When there are four smoke vents, the temperature field is in a good range compared with other schemes. If four smoke vents are opened, the total smoke exhaust efficiency is highest, and exhaust rate has little influence on total exhaust efficiency. Total smoke exhaust efficiency of the tunnel is more than 93.7% under different exhaust volumes, and the maximum difference of total smoke exhaust efficiency is less than 1.5% under different exhaust volume of Case “4”. The exhaust volume has little influence on temperature decay beneath the ceiling, and a temperature attenuation model of a point exhaust tunnel with four smoke vents was proposed. For the single-side point exhaust tunnels, the number of smoke vents near the exhaust fan side shall not be more than that on the other side. Four smoke vents shall be opened in case of fire and the exhaust volume is 220 m³/s with HRR of 30 MW.

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Experimental Study on Flame Extension and Pattern Analysis of Jet Fire Impinging Wood Plates

Chen

Yu²,

Lin³

et al. 2022

Fire Technol

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Experimental study on the maximum temperature and flame extension length driven by strong plume in a longitudinal ventilated tunnel

Cited by 30 publications

References 18 publications

Study on the flame morphological characteristics of dual fire sources in tunnel under longitudinal ventilation

Study on the flame morphological characteristics of dual fire sources in tunnel under longitudinal ventilation

Effect of Different Smoke Vent Layouts on Smoke and Temperature Distribution in Single-Side Multi-Point Exhaust Tunnel Fires: A Case Study

Experimental Study on Flame Extension and Pattern Analysis of Jet Fire Impinging Wood Plates

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