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Abstract: Jet ventilation is widely used in the ventilation design of highway and railway tunnels as an important air supply method during tunnel operation and disaster periods. This ventilation method has also been applied for fire control in immersed tunnels. We conduct numerical simulations using computational fluid dynamics (CFD) to study positive ventilation in the upstream and reverse ventilation in the downstream (P-R) for an extra-wide immersed tunnel. The effects of fire source location and jet fan air velocity response strategy on the ceiling temperature decay, carbon monoxide (CO) distribution, and smoke exhaust efficiency were investigated for varying fire source locations. The results show that flames will be tilted to the side of the jet fan with a smaller air velocity. Additionally, the jet fan air velocity should be adjusted based on the relative distance between the fire source and the smoke vent. Among the studied scenarios, the most effective outcome was achieved when the air velocity was adjusted to 25 m/s on the side near the smoke vent. Also in this scenario, the phenomenon of smoke deposition was effectively mitigated and the average smoke exhaust efficiency reached 87%. Moreover, we found that the temperature decay of the tunnel follows an exponential decay law. The temperature decay rate is significantly higher on the side closest to the smoke vent compared to the farther side. This research provides a theoretical basis for smoke control strategies for fires that occur in immersed tunnels.

射流风机风速响应策略和火源位置对沉管隧道火灾烟气控制的影响

[1]BaiZP, LiYF, LiJM, 2019. Numerical study the performance of jet fans in utility tunnel ventilation. International Conference on Intelligent Transportation, Big Data & Smart City, p.36-38.

[2]ChenCK, ZhangYL, LeiP, et al., 2020. A study for predicting the maximum gas temperature beneath ceiling in sealing tactics against tunnel fire. Tunnelling and Underground Space Technology, 98:103275.

[3]ChenCK, JiaoWB, ZhangYL, et al., 2023. Experimental investigation on the influence of longitudinal fire location on critical velocity in a T-shaped tunnel fire. Tunnelling and Underground Space Technology, 134:104983.

[4]ChungCY, ChungPL, 2007. A numerical and experimental study of pollutant dispersion in a traffic tunnel. Environmental Monitoring and Assessment, 130(1-3):289-299.

[5]GaoZH, LiuMG, ZhaoPJ, et al., 2024. Influence of tunnel slope on the one-dimensional spread of smoke transportation and temperature distribution in tunnel fires. Tunnelling and Underground Space Technology, 146:105650.

[6]GannouniS, MaadRB, 2015. Numerical study of the effect of blockage on critical velocity and backlayering length in longitudinally ventilated tunnel fires. Tunnelling and Underground Space Technology, 48:147-155.

[7]HeK, ChengXD, ZhangSG, et al., 2018. Critical roof opening longitudinal length for complete smoke exhaustion in subway tunnel fires. International Journal of Thermal Sciences, 133:55-61.

[8]HeL, LiaoK, ZhouYH, et al., 2023. Study on the influence of the longitudinal position of the fire source on the movement behavior of the asymmetric flow field. Thermal Science and Engineering Progress, 39:101753.

[9]HoYT, KawabataN, SeikeM, et al., 2022. Scale model experiments and simulations to investigate the effect of vehicular blockage on backlayering length in tunnel fire. Buildings, 12(7):1006.

[10]HuLH, HuoR, LiYZ, et al., 2005. Full-scale burning tests on studying smoke temperature and velocity along a corridor. Tunnelling and Underground Space Technology, 20(3):223-229.

[11]HuLH, HuoR, ChowWK, 2008. Studies on buoyancy-driven back-layering flow in tunnel fires. Experimental Thermal and Fluid Science, 32(8):1468-1483.

[12]IngasonH, LiYZ, 2010. Model scale tunnel fire tests with longitudinal ventilation. Fire Safety Journal, 45(6-8):371-384.

[13]JiJ, TanTT, GaoZH, et al., 2019. Numerical investigation on the influence of length–width ratio of fire source on the smoke movement and temperature distribution in tunnel fires. Fire Technology, 55(3):963-979.

[14]JiangYQ, ZhangTH, LiuS, et al., 2022. Full-scale fire tests in the underwater tunnel section model with sidewall smoke extraction. Tunnelling and Underground Space Technology, 122:104374.

[15]KhalidS, WangZY, ZhouYL, et al., 2023. Numerical modeling on mechanical smoke extraction efficiency of multiple lateral smoke extraction vents system in an immersed tunnel. International Journal of Thermal Sciences, 193:108548.

[16]LiLM, ChengXD, WangXG, et al., 2012. Temperature distribution of fire-induced flow along tunnels under natural ventilation. Journal of Fire Sciences, 30(2):122-137.

[17]LiQ, KangJH, WangYN, et al., 2023. Superheated steam similarity simulation on longitudinal distribution of maximum smoke temperature rise in tunnel fires. Thermal Science and Engineering Progress, 37:101550.

[18]LiQ, KangJH, MeiJ, 2024. Experimental study on the fire control and smoke transportation using sealing strategy in tunnel. Tunnelling and Underground Space Technology, 143:105488.

[19]LiYZ, LeiB, IngasonH, 2010. Study of critical velocity and backlayering length in longitudinally ventilated tunnel fires. Fire Safety Journal, 45(6-8):361-370.

[20]LiuS, JiangYQ, ChenJZ, et al., 2016. Full-scale experimental research on the effect of smoke exhaust strategies on efficiency of point extraction system in an underwater tunnel. Procedia Engineering, 166:362-372.

[21]LiuSL, WangL, YuMG, et al., 2021. Optimization of smoke exhaust efficiency under a lateral central exhaust ventilation mode in an extra-wide immersed tunnel. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 22(5):396-406.

[22]McGrattanKB, McDermottRJ, WeinschenkCG, et al., 2013. Fire Dynamics Simulator User’s Guide. 6th Edition. National Institute of Standards and Technology, USA.

[23]MengN, LiuBB, LiX, et al., 2018. Effect of blockage-induced near wake flow on fire properties in a longitudinally ventilated tunnel. International Journal of Thermal Sciences, 134:1-12.

[24]MingYY, ZhuGQ, HeL, et al., 2023. Study on smoke flow characteristics in immersed tunnel fires with lateral centralized exhaust: considering the effect of the slope. Case Studies in Thermal Engineering, 51:103511.

[25]OkaY, AtkinsonGT, 1995. Control of smoke flow in tunnel fires. Fire Safety Journal, 25(4):305-322.

[26]SeCMK, LeeEWM, LaiACK, 2012. Impact of location of jet fan on airflow structure in tunnel fire. Tunnelling and Underground Space Technology, 27(1):30-40.

[27]TaoLL, ZhangYM, HouKX, et al., 2020. Experimental study on temperature distribution and smoke control in emergency rescue stations of a slope railway tunnel with semi-transverse ventilation. Tunnelling and Underground Space Technology, 106:103616.

[28]TaoLL, ZengYH, LiJ, et al., 2022. Study on the maximum temperature and temperature decay in single-side centralized smoke exhaust tunnel fires. International Journal of Thermal Sciences, 172:107277.

[29]ThomasPH, 1958. The movement of buoyant fluid against a stream and the venting of underground fires. Fire Safety Science, 1958:351.

[30]ThomasPH, 1968. The movement of smoke in horizontal passages against an air flow. Fire Safety Science, 1968:723.

[31]WangF, WangMN, WangQY, 2012. Numerical study of effects of deflected angles of jet fans on the normal ventilation in a curved tunnel. Tunnelling and Underground Space Technology, 31:80-85.

[32]WengMC, LuXL, LiuF, et al., 2016. Study on the critical velocity in a sloping tunnel fire under longitudinal ventilation. Applied Thermal Engineering, 94:422-434.

[33]XuP, JiangSP, XingRJ, et al., 2018. Full-scale immersed tunnel fire experimental research on smoke flow patterns. Tunnelling and Underground Space Technology, 81:494-505.

[34]ZhangSG, HuangYL, LinB, et al., 2022. Numerical investigation on the characteristics of lateral smoke extraction in the immersed road tunnel. Fire and Materials, 46(8):1111-1126.

[35]ZhangSG, ShiYL, ShiL, et al., 2023. Numerical study on lateral centralized smoke extraction in immersed tunnel with a new-style inclined smoke barrier. Case Studies in Thermal Engineering, 42:102770.

[36]ZhaoSZ, LiuF, WangF, et al., 2018. Experimental studies on fire-induced temperature distribution below ceiling in a longitudinal ventilated metro tunnel. Tunnelling and Underground Space Technology, 72:281-293.

[37]ZarnaghshA, AboualiO, EmdadH, et al., 2019. A numerical study of the train-induced unsteady airflow in a tunnel and its effects on the performance of jet fans. Journal of Wind Engineering and Industrial Aerodynamics, 187:1-14.