Abstract
Blind roadways have only one portal which connects with other types of mine roadways. Sealing the fire area in a blind roadway is an effective method of disaster relief in a mine. To understand the effect of sealing ratio and sealing distance on fire behavior, Fire Dynamics Simulator (FDS 6.6) was used to study blind roadway fires with different fire scenarios. Results indicate that the smoke flow velocity increases significantly with the increase of sealing distance. The fire in the blind roadway is ventilation-controlled. When the sealing ratio reaches 80%, the fire self-extinguishes completely. Otherwise, the fire experiences an extinguishing-reburning cycle periodically. Besides, an empirical model is proposed to predict the downstream temperature distribution beneath the ceiling in the region from fire source to sealing position. The predictions by the proposed model comply well with the simulation and experimental results from our and others’ studies. This study provides new insights into the sealing strategies in blind roadway fires, and the outcomes of the current study are of guiding significance for the fire rescue in the blind roadways or similar structures.
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Data availability
The data and materials used and analyzed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- \(\dot{Q}\) :
-
Heat release rate (kW)
- \({\dot{Q}}^{*}\) :
-
Dimensionless heat release rate
- r :
-
Sealing ratio (%)
- d :
-
Sealing distance (m)
- c p :
-
Heat capacity of air (kJ/kg·K)
- ρ 0 :
-
Air density (kg/m3)
- T a :
-
Ambient air temperature (K)
- g :
-
Gravitational acceleration (m/s2)
- Η :
-
Tunnel height (m)
- h :
-
Sealing height (m)
- x :
-
Distance from fire source (m)
- \({\Delta T}_{\mathrm{max}}\) :
-
Maximum gas temperature rise (K)
- \(\Delta {T}_{\mathrm{max}}^{*}\) :
-
Dimensionless maximum gas temperature rise
- \(\Delta {T}_{x}\) :
-
Gas temperature rise at measuring point x (K)
- \({T}_{x}\) :
-
Gas temperature at measuring point x (K)
- \(\phi\) :
-
Equivalence ratio
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Funding
This work was supported by the National Natural Science Foundation of China (No. 52206186), Fundamental Research Funds for the Central Universities (No. 2022JCCXAQ05), and Opening Fund of the State Key Laboratory of Fire Science (No. HZ2020-KF02).
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All authors contributed to the study conception and design, as below:
Yongzheng Yao: methodology, writing-original draft, supervision
Jingxin Wang: investigation, writing-original draft
Lei Jiang: reviewing
Bing Wu: reviewing, supervision
Baolin Qu: investigation
All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Yongzheng Yao and Jingxin Wang contributed to the work equally and should be regarded as co-first authors.
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Yao, Y., Wang, J., Jiang, L. et al. Numerical study on fire behavior and temperature distribution in a blind roadway with different sealing situations. Environ Sci Pollut Res 30, 36967–36978 (2023). https://doi.org/10.1007/s11356-022-24896-4
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DOI: https://doi.org/10.1007/s11356-022-24896-4