Experimental Study on the Smoke Temperature Decrease near Natural Vents Induced by Air Entrainment in a Tunnel Fire

Previous studies have shown that there is a large difference in the temperature of smoke in the upstream and downstream of a vertical shaft, but no quantitative study on the subject has been conducted. In this paper, a model experimental test was conducted to study the effect of a natural vertical s...

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Published inAdvances in Civil Engineering Vol. 2023; pp. 1 - 11
Main Authors Yu, Hai, Yang, Yunhao, Yin, Jiyao, Deng, Peng, Sun, Yanlong, Zhou, Lin, Liu, Zhenguo
Format Journal Article
LanguageEnglish
Published New York Hindawi 28.03.2023
John Wiley & Sons, Inc
Wiley
Subjects
Air entrainment
Analysis
Civil engineering
Cold
Empirical analysis
Entrainment
Flow velocity
Heat
Heat release rate
Heat transfer
Interfaces
Model testing
Prediction models
Predictions
Quantitative research
Smoke
Temperature
Tunnels
Upstream
Ventilation
Vertical distribution
China
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Abstract Previous studies have shown that there is a large difference in the temperature of smoke in the upstream and downstream of a vertical shaft, but no quantitative study on the subject has been conducted. In this paper, a model experimental test was conducted to study the effect of a natural vertical shaft on the distribution of smoke temperature in tunnel fires. A laser sheet was used as an assisting tool to show the smoke flow field. A series of tests were conducted with shaft heights varying from 0.2 m to 1.2 m and a heat release rate (HRR) of 9 kW, 17 kW, 29 kW, and 65 kW. The entrainment phenomenon around the vertical shaft was analyzed, and the results showed that the amount of fresh air entrainment is the main reason for the temperature decrease in upstream and downstream smoke temperatures. Based on the experimental results, an empirical model for predicting the amount of fresh air entrainment and a prediction model of the downstream smoke temperature were proposed, and the predicted values are in good agreement with the experimental values.
AbstractList Previous studies have shown that there is a large difference in the temperature of smoke in the upstream and downstream of a vertical shaft, but no quantitative study on the subject has been conducted. In this paper, a model experimental test was conducted to study the effect of a natural vertical shaft on the distribution of smoke temperature in tunnel fires. A laser sheet was used as an assisting tool to show the smoke flow field. A series of tests were conducted with shaft heights varying from 0.2 m to 1.2 m and a heat release rate (HRR) of 9 kW, 17 kW, 29 kW, and 65 kW. The entrainment phenomenon around the vertical shaft was analyzed, and the results showed that the amount of fresh air entrainment is the main reason for the temperature decrease in upstream and downstream smoke temperatures. Based on the experimental results, an empirical model for predicting the amount of fresh air entrainment and a prediction model of the downstream smoke temperature were proposed, and the predicted values are in good agreement with the experimental values.
Previous studies have shown that there is a large difference in the temperature of smoke in the upstream and downstream of a vertical shaft, but no quantitative study on the subject has been conducted. In this paper, a model experimental test was conducted to study the effect of a natural vertical shaft on the distribution of smoke temperature in tunnel fires. A laser sheet was used as an assisting tool to show the smoke flow field. A series of tests were conducted with shaft heights varying from 0.2m to 1.2m and a heat release rate (HRR) of 9kW, 17kW, 29kW, and 65kW. The entrainment phenomenon around the vertical shaft was analyzed, and the results showed that the amount of fresh air entrainment is the main reason for the temperature decrease in upstream and downstream smoke temperatures. Based on the experimental results, an empirical model for predicting the amount of fresh air entrainment and a prediction model of the downstream smoke temperature were proposed, and the predicted values are in good agreement with the experimental values.
Audience Academic
Author Liu, Zhenguo
Sun, Yanlong
Zhou, Lin
Yang, Yunhao
Yin, Jiyao
Yu, Hai
Deng, Peng
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Copyright © 2023 Hai Yu et al. This is an open access article distributed under the Creative Commons Attribution License (the “License”), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. https://creativecommons.org/licenses/by/4.0
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SubjectTerms Air entrainment
Analysis
Civil engineering
Cold
Empirical analysis
Entrainment
Flow velocity
Heat
Heat release rate
Heat transfer
Interfaces
Model testing
Prediction models
Predictions
Quantitative research
Smoke
Temperature
Tunnels
Upstream
Ventilation
Vertical distribution
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Title Experimental Study on the Smoke Temperature Decrease near Natural Vents Induced by Air Entrainment in a Tunnel Fire
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