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Journal of Tsinghua University(Science and Technology)    2023, Vol. 63 Issue (5) : 754-764     DOI: 10.16511/j.cnki.qhdxxb.2022.26.055
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Research for smoke control in a subway tunnel under the ceiling multi-point vertical smoke exhaust
ZHONG Maohua1, HU Peng2, CHEN Junfeng1, CHENG Huihang1, WU Le1, WEI Xuan3
1. Institute of Public Safety Research, Department of Engineering Physics, Tsinghua University, Beijing 100084, China;
2. School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China;
3. Xinjiang Vital Development and Construction (Group) Co., Ltd., Urumqi 830000, China
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Abstract  [Objective] To investigate the metro interval tunnel fire under the ceiling multipoint vertical smoke exhaust, the smoke temperature distribution under the tunnel ceiling is analyzed by performing a series of field fire experiments at a scale of 0.25-1.25 MW in a subway section tunnel.[Methods] A fire dynamics simulator numerical simulation tunnel model corresponding to the actual size is established. Subsequently, by increasing the fire source heat release rate (5.00-20.00 MW) and the exhaust air volume of the ventilation tunnel (0-120 m3/s), the critical exhaust air volume and exhaust efficiency is investigated, which can help in mitigating the spread of downstream smoke.[Results] According to the experiment and simulation results, different fire source positions exhibited no effect on the range of the lateral centerline temperature increase area. The position of the smoke exhaust port enabled the suppression of the increase in the ceiling temperature due to the elevated fire source heat release rate. Thus, establishing the air inlet in the metro tunnel could suppress the reverse flow of the smoke; however, it would make the downstream smoke unstable, and the exhaust port could not completely discharge the high-temperature smoke. The smoke temperature of the exhaust port near the fire source, which was related to the fire source heat release rate, but was almost independent of the exhaust air volume. With the increase of the exhaust air volume, it almost remained unchanged. Concurrently, the smoke exhaust port near the fire source played a major role in exhausting the smoke and heat. A critical exhaust air volume completely exhausted all the smoke generated by the fire, whose value was related to the fire source heat release rate. The Fr characterized the ratio of the inertial force to the buoyancy of the smoke layer. The dimensionless Fr was used to determine whether "plug-holing" occurs in the smoke exhaust system. The critical Fr was calculated to be approximately 2.7, slightly higher than that in previous studies.[Conclusions] The exhaust efficiency is an important parameter reflecting the exhaust effect of the exhaust port in the tunnel. The smoke exhaust efficiency of the exhaust port is calculated using the ratio of the mass flow rate of CO in the smoke discharged from the exhaust port and the total downstream CO mass flow rate of the smoke. With the increase in the exhaust air volume, the mass flow of CO discharged from the exhaust port close to the fire source first increases and then gradually becomes flat primarily because the exhaust efficiency of the exhaust port reaches saturation. Therefore, for different exhaust air volumes and fire source heat release rates, the exhaust efficiency first increases and then remains constant. Thus, when the exhaust air volume reaches a certain value, the exhaust port can completely discharge all the high-temperature smoke, and the exhaust efficiency of the port becomes 1. The empirical formula among the smoke exhaust efficiency, the Fr, and the dimensionless wind speed is obtained, and the empirical formula presents a piecewise function relationship.
Keywords metro tunnel      ventilation tunnel      full scale      numerical simulation      Fr      smoke extraction efficiency     
Issue Date: 23 April 2023
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Articles by authors
ZHONG Maohua
HU Peng
CHEN Junfeng
CHENG Huihang
WU Le
WEI Xuan
Cite this article:   
ZHONG Maohua,HU Peng,CHEN Junfeng, et al. Research for smoke control in a subway tunnel under the ceiling multi-point vertical smoke exhaust[J]. Journal of Tsinghua University(Science and Technology), 2023, 63(5): 754-764.
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http://jst.tsinghuajournals.com/EN/10.16511/j.cnki.qhdxxb.2022.26.055     OR     http://jst.tsinghuajournals.com/EN/Y2023/V63/I5/754
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
[1] HU L H, FONG N K, YANG L Z, et al. Modeling fire-induced smoke spread and carbon monoxide transportation in a long channel:Fire dynamics simulator comparisons with measured data[J]. Journal of Hazardous Materials, 2007, 140(1-2):293-298.
[2] INGASON H, LI Y Z, LÖNNERMARK A. Tunnel fire dynamics[M]. New York:Springer, 2015.
[3] LÖNNERMARK A, INGASON H, LI Y Z, et al. Fire development in a 1/3 train carriage mock-up[J]. Fire Safety Journal, 2017, 91:432-440.
[4] 钟茂华, 刘畅, 田向亮, 等. 地铁同站台高架换乘车站火灾全尺寸实验研究:(1)火灾场景设计[J]. 中国安全生产科学技术, 2018, 14(3):27-33. ZHONG M H, LIU C, TIAN X L, et al. Full-scale experimental study on fire in one-platform-interchange elevated metro station:(1) design of fire scenario[J]. Journal of Safety Science and Technology, 2018, 14(3):27-33. (in Chinese)
[5] 钟茂华, 刘畅, 田向亮, 等. 地铁同站台高架换乘车站火灾全尺寸实验研究:(2)站厅火灾[J]. 中国安全生产科学技术, 2018, 14(4):5-12. ZHONG M H, LIU C, TIAN X L, et al. Full-scale experimental study on fire in one-platform-interchange elevated metro station:(2) station hall fire[J]. Journal of Safety Science and Technology, 2018, 14(4):5-12. (in Chinese)
[6] 史聪灵, 钟茂华, 何理, 等. 地铁车站及隧道全尺寸火灾实验研究(1):实验设计[J]. 中国安全生产科学技术, 2012, 8(6):22-28. SHI C L, ZHONG M H, HE L, et al. Investigation of full-scale fire experiments in metro station and tunnel (1):Experimental setup[J]. Journal of Safety Science and Technology, 2012, 8(6):22-28. (in Chinese)
[7] 史聪灵, 钟茂华, 汪良旗, 等. 地铁车站及隧道全尺寸火灾实验研究(2):区间隧道火灾[J]. 中国安全生产科学技术, 2012, 8(8):28-34. SHI C L, ZHONG M H, WANG L Q, et al. Investigation of full-scale burning experiments in metro station and tunnel (2):Interval tunnel fires[J]. Journal of Safety Science and Technology, 2012, 8(8):28-34. (in Chinese)
[8] WENG M C, YU L X, LIU F, et al. Full-scale experiment and CFD simulation on smoke movement and smoke control in a metro tunnel with one opening portal[J]. Tunnelling and Underground Space Technology, 2014, 42:96-104.
[9] 翁庙成, 余龙星, 刘方, 等. 一端开敞的地铁区间隧道烟气流动特性及其烟气控制研究[J]. 中南大学学报(自然科学版), 2014, 45(7):2311-2319. WENG M C, YU L X, LIU F, et al. Study on fire smoke flow and smoke control in underground metro tunnel with one end to outside[J]. Journal of Central South University (Science and Technology), 2014, 45(7):2311-2319. (in Chinese)
[10] 王维. 城市地下公路隧道自然排烟竖井设置[J]. 消防科学与技术, 2013, 32(6):598-601. WANG W. Layout of vertical shaft of natural smoke exhaust in city underground tunnel[J]. Fire Science and Technology, 2013, 32(6):598-601. (in Chinese)
[11] TONG Y, SHI M H, GONG Y F, et al. Full-scale experimental study on smoke flow in natural ventilation road tunnel fires with shafts[J]. Tunnelling and Underground Space Technology, 2009, 24(6):627-633.
[12] FAN C G, JI J, GAO Z H, et al. Experimental study of air entrainment mode with natural ventilation using shafts in road tunnel fires[J]. International Journal of Heat and Mass Transfer, 2013, 56(1-2):750-757.
[13] JI J, GAO Z H, FAN C G, et al. A study of the effect of plug-holing and boundary layer separation on natural ventilation with vertical shaft in urban road tunnel fires[J]. International Journal of Heat and Mass Transfer, 2012, 55(21-22):6032-6041.
[14] XU Z S, LIU Q L, HE L, et al. Study on the heat exhaust coefficient and smoke flow characteristics under lateral smoke exhaust in tunnel fires[J]. Fire and Materials, 2019, 43(7):857-867.
[15] XU Z S, CHEN H G, HE L, et al. Analysis on the influence of the smoke block board on the entrainment phenomena near a mechanical exhaust vent[J]. Case Studies in Thermal Engineering, 2018, 12:569-577.
[16] 陶浩文, 刘耀辉, 徐志胜, 等. 隧道挡风板对竖井自然排烟效率的影响研究[J/OL]. 安全与环境学报. (2021-08-11)[2022-06-15]. DOI:10.13637/j.issn.1009-6094.20210934. TAO H W, LIU Y H, XU Z S, et al. Study on the effect of tunnel barge boards on the smoke extraction efficiency of shaft with natural ventilation[J/OL]. Journal of Safety and Environment. (2021-08-11)[2022-06-15]. DOI:10.13637/j.issn.1009-6094.20210934. (in Chinese)
[17] HINKLEY P L. Rates of 'production' of hot gases in roof venting experiments[J]. Fire Safety Journal, 1986, 10(1):57-65.
[18] MORGAN H P, GARDINER J P. Design principles for smoke ventilation in enclosed shopping centres[M]. Garston:Building Research Establishment, 1990.
[19] LI Y Z, LEI B, INGASON H. Study of critical velocity and backlayering length in longitudinally ventilated tunnel fires[J]. Fire Safety Journal, 2010, 45(6-8):361-370.
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