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学者姓名：李炎锋
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摘要 ：
This study conduct a set of small-scale experiments to examine the combined impact of ramp slopes and bifurcation angles on the longitudinal temperature profile beneath the ceiling of a model of branched tunnel. A Liquefied Petroleum Gas (LPG) fire was used to simulated car fires. The range of heat release rates for the experiments was 2.57 kW to 7.70 kW. The experiments also encompassed three bifurcation angles (5 degrees to 15 degrees) and five ramp slopes (0%, 3%, 5%, 7%, and 9%). A simple model was developed to analyze the steady fire-produced ceiling jet in the branched tunnel. It has been found that the longitudinal temperature decay was not affected by the ramp slopes and bifurcation angles. However, the longitudinal temperature decay varied across different tunnel regions due to the dimensions of the tunnel cross section and the branched structure resulting in smoke divergence flow. In addition, the study established a modified model of longitudinal temperature decay based on the experimental results. The results could be used as a point of reference in developing smoke extraction tactics for branched tunnels.
关键词 ：
fire smoke fire smoke Longitudinal temperature decay Longitudinal temperature decay branched tunnels branched tunnels ramp slopes ramp slopes
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| GB/T 7714 | Li, Jiaxin , Li, Yanfeng , Li, Junmei et al. Evaluating the Temperature Profile in a Branched Tunnel Fire with Various Ramp Slopes: An Experimental Study [J]. | COMBUSTION SCIENCE AND TECHNOLOGY , 2024 . |
| MLA | Li, Jiaxin et al. "Evaluating the Temperature Profile in a Branched Tunnel Fire with Various Ramp Slopes: An Experimental Study" . | COMBUSTION SCIENCE AND TECHNOLOGY (2024) . |
| APA | Li, Jiaxin , Li, Yanfeng , Li, Junmei , Xu, Desheng . Evaluating the Temperature Profile in a Branched Tunnel Fire with Various Ramp Slopes: An Experimental Study . | COMBUSTION SCIENCE AND TECHNOLOGY , 2024 . |
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摘要 ：
Smoke control within metro tunnels stands as a pivotal measure in ensuring both the orderly evacuation and safety of passengers. This study investigated the critical velocity and confinement velocity in inclined metro tunnel fires via model-scale experiments. The tunnel slope varied from 2 % similar to 8 % and four fire heat release rates of 2.29 kW, 3.44 kW, 4.59 kW and 5.74 kW. Results show that the confinement velocity and critical velocity monotonically increase with the heat release rate and tunnel slope. The confinement velocity V-conf was notably affected by the equivalent fire source Q(u). The natural exponential function could effectively express the relationship between Q* and Q(u)*, with the correction factor of tunnel slope utilized to adjust the expression. A new model for critical velocity and confinement velocity was characterized by considering the tunnel slope and heat release rate. Comparative results indicated that the optimizing confinement velocity was significantly lower than that defined in previous studies, while the proposed critical velocity ratio aligns well with findings from prior research. This study provides valuable insights into the design of smoke control systems customized for fires occurring in trains immobilized within inclined underground tunnels.
关键词 ：
Critical velocity Critical velocity Confinement velocity Confinement velocity Smoke control Smoke control Inclined tunnel fire Inclined tunnel fire Metro system Metro system
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| GB/T 7714 | Su, Zhihe , Li, Yanfeng , Zhong, Hua et al. Evaluating the impact of tunnel slope on critical velocity and confinement velocity in metro tunnel carriage fires [J]. | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2024 , 154 . |
| MLA | Su, Zhihe et al. "Evaluating the impact of tunnel slope on critical velocity and confinement velocity in metro tunnel carriage fires" . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY 154 (2024) . |
| APA | Su, Zhihe , Li, Yanfeng , Zhong, Hua , Li, Junmei , Li, Boyu , Kang, Siyan et al. Evaluating the impact of tunnel slope on critical velocity and confinement velocity in metro tunnel carriage fires . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2024 , 154 . |
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摘要 ：
Urban utility tunnels are integral to the underground power transmission systems of cities. Enhancing the understanding of cable fire hazards within these tunnels is pivotal for fostering risk-resilient underground environments. This study delves into the temperature distribution characteristics of near-wall cable fires in urban utility tunnels. Employing a reduced-scale utility tunnel model, a series of fire experiments were conducted, focusing on the safety monitoring of horizontally arranged cables. Cone calorimeter tests were initially performed to ascertain the heat release rate of cable fires. The study meticulously considered cable spatial position parameters, such as cable height and near-wall distance, as dependent variables, and monitored real-time temperature changes within the utility tunnel under various fire scenarios. The findings reveal that the cable's proximity to the wall significantly influences the fire temperature field. For instance, when a fire near the sidewall (at 1 cm) is compared to one in the middle of the tunnel (at 20 cm), the ceiling maximum temperature is reduced by 38.9 %. The sidewall's limiting effect diminishes fire energy release, moderates vertical temperature decay, and enhances longitudinal temperature attenuation. The study introduces dimensionless mathematical models that account for the sidewall effect, quantifying the characteristics of fireinduced smoke temperature distribution in utility tunnels, such as ceiling maximum temperature rise, vertical smoke temperature profile, and longitudinal smoke temperature decay. The models' predicted values closely align with the experimental results. These insights are pivotal for integrating cable numbers and spatial positioning in scenario-based fire prevention and mitigation strategies. The study's implications extend to the design and operation of urban utility tunnels, emphasizing the need for strategic cable placement and the potential for mathematical models to inform risk mitigation measures. The research contributes to the advancement of sustainable urban development by providing a framework for enhancing the safety and resilience of critical infrastructure against fire hazards.
关键词 ：
Temperature distribution Temperature distribution Near -wall cable fire Near -wall cable fire Risk -resilient understanding Risk -resilient understanding Urban utility tunnel Urban utility tunnel Underground power transmission Underground power transmission
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| GB/T 7714 | Xu, Desheng , Li, Yanfeng , Yang, Xin et al. Enhancing resilience in urban utility tunnels power transmission systems: Analysing temperature distribution in near-wall cable fires for risk mitigation [J]. | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2024 , 152 . |
| MLA | Xu, Desheng et al. "Enhancing resilience in urban utility tunnels power transmission systems: Analysing temperature distribution in near-wall cable fires for risk mitigation" . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY 152 (2024) . |
| APA | Xu, Desheng , Li, Yanfeng , Yang, Xin , Zhong, Hua , Li, Junmei , Li, Jiaxin et al. Enhancing resilience in urban utility tunnels power transmission systems: Analysing temperature distribution in near-wall cable fires for risk mitigation . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2024 , 152 . |
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摘要 ：
Cross -passage is a commonly encountered structure within metro tunnels, providing a swift route for evacuating personnel from the accident tunnel to the safe tunnel opposite. Ventilation in the cross -passage of metro tunnels is established through the collaborative operation of ventilation systems on both sides of the tunnel. Concurrently, smoke movement within the metro tunnel is impacted by factors such as train blockage and the accumulation of heat within the train carriages. The former correlations need further refinement to predict the critical velocity and driving force required to prevent smoke from spreading into a metro tunnel cross -passage. Onedimensional theoretical analysis and full-scale cold smoke experiments were performed to investigate the relationship between the air supply parameters of tunnel fans on both sides and the ventilation velocity in the crosspassage. A calculation model of fan type selection in the opposite side safe tunnel for smoke control in the tunnel cross -passage is proposed. The influence of train location, fire heat release rate, and main tunnel ventilation velocity on critical velocity in the cross -passage was quantified by numerical simulations. The results show that the critical velocity in the cross -passage under unobstructed conditions surpasses that under blocked conditions. Meanwhile, the critical velocity exhibits relative stability under both unobstructed and blocked conditions. On the basis of the dimensionless analysis, a piecewise function was proposed to predict the critical velocity in tunnel cross -passage. The outcomes of this study provide valuable guidance for the implementation of fire prevention and smoke control measures in tunnels with similar structures.
关键词 ：
Critical velocity Critical velocity Metro tunnel fire Metro tunnel fire Required pressure Required pressure Fan selection Fan selection Tunnel cross-passage Tunnel cross-passage
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| GB/T 7714 | Su, Zhihe , Li, Yanfeng , Zhong, Hua et al. Advancements in smoke control strategies for metro tunnel cross-passage: A theoretical and numerical study on critical velocity and driving force [J]. | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2024 , 147 . |
| MLA | Su, Zhihe et al. "Advancements in smoke control strategies for metro tunnel cross-passage: A theoretical and numerical study on critical velocity and driving force" . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY 147 (2024) . |
| APA | Su, Zhihe , Li, Yanfeng , Zhong, Hua , Li, Junmei , Guo, Zhicheng , Yang, Xin et al. Advancements in smoke control strategies for metro tunnel cross-passage: A theoretical and numerical study on critical velocity and driving force . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2024 , 147 . |
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摘要 ：
本发明公开了一种基于正反交错模型的火源逆向定位辨识方法，包括：确定火灾可能发生的位置、火源燃烧时间的取值范围；确定火源逐时热释放速率与CO逐时释放浓度关系；通过响应因子方法建立所有火源位置的CO释放浓度与监测点的响应矩阵；增强逆算模型的稳定性；选取规整化矩阵L和规整化参数λ，并通过监测点1的数据逆向计算所有火源位置下的CO逐时释放率；正向计算监测点2的监测浓度数据；确定先验概率和似然函数；采用贝叶斯概率模型确定火源的位置；通过火源逐时热释放率与CO逐时释放浓度的对应关系，确定火源的逐时热释放速率。本发明求解火源位置及热释放速率方法解决了传统火灾探测的单一性和复杂性，提供了新方案。
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| GB/T 7714 | 李炎锋 , 苏枳赫 , 赵建龙 et al. 一种基于正反交错模型的火源逆向定位辨识方法 : CN202310600831.1[P]. | 2023-05-25 . |
| MLA | 李炎锋 et al. "一种基于正反交错模型的火源逆向定位辨识方法" : CN202310600831.1. | 2023-05-25 . |
| APA | 李炎锋 , 苏枳赫 , 赵建龙 , 田伟 , 杨石 , 郭志成 et al. 一种基于正反交错模型的火源逆向定位辨识方法 : CN202310600831.1. | 2023-05-25 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
本发明公开了一种针对综合管廊电缆火灾蔓延的智能控制灭火系统及方法，包括：实验台主体、火源系统、火灾监测系统、火灾预测系统以及智能控制灭火系统。所述实验台能够模拟综合管廊电缆在不同位置处发生火灾，实现对电缆火灾蔓延的精准预测，将全景红外热成像传感器按照等间距布置在实验台主体顶棚下方滑轨侧面以及细水雾喷头中部，连接物体检测网络可迅速识别定位火灾位置并获取电缆火灾火焰蔓延特性数据集。所述火灾预测系统，采用基于神经网络的模型来进行火灾预测模型训练，组建电缆火灾蔓延特征预测数据库，构建时间序列综合管廊电缆火灾蔓延预测趋势。
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| GB/T 7714 | 李炎锋 , 许德胜 , 陈超 et al. 一种针对综合管廊电缆火灾蔓延的智能控制灭火系统及方法 : CN202310600832.6[P]. | 2023-05-25 . |
| MLA | 李炎锋 et al. "一种针对综合管廊电缆火灾蔓延的智能控制灭火系统及方法" : CN202310600832.6. | 2023-05-25 . |
| APA | 李炎锋 , 许德胜 , 陈超 , 杨新 , 李俊梅 , 李嘉欣 et al. 一种针对综合管廊电缆火灾蔓延的智能控制灭火系统及方法 : CN202310600832.6. | 2023-05-25 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Underground metro systems are expanding rapidly worldwide, necessitating research on energy-efficient ventilation systems, fire safety, and smoke control. This study investigates the optimisation of hybrid mechanical-natural ventilation for smoke control in complex metro stations. Full-scale winter/summer experiments and numerical simulations examined a double-deck atrium-type station. Results demonstrate the atrium fires are more significantly impacted by outdoor temperature variations versus concourse/platform fires, with a 70 K versus 30 K temperature rise above the fire respectively. The heat of the gathered high-temperature smoke inside the atrium can reach up to 900 K under a 5 MW train fire energy release. The dimensionless Archimedes number (Ar) defines the ratio of thermal buoyancy to gravitational forces. Cold exterior winter air (Ar<1) entering via the atrium ceiling openings restricted vertical smoke diffusion, enabling enhanced lateral propagation. With rising outdoor temperatures from -20 degrees C to 10 degrees C (Ar<1), the natural smoke extraction efficiency increased from 0 to 18 %, coupled with vertical airflow velocities accelerating from -3.5 m/s to 1.5 m/s. When outdoor temperatures were between 10 degrees C and 40 degrees C (Ar>1), airflow velocity only changed slightly. Empirical models predict internal temperature profiles as a function of external meteorology. The findings provide crucial engineering insights into integrating weather data and adaptable ventilation protocols for scenario-based smoke prevention/mitigation. Further work should examine seasonal variations beyond the tested -20-40 degrees C range. Overall, considering outdoor climate effects allows 30 % optimisation of hybrid ventilation systems for fire safety in underground metro stations. This study promotes technological advances in energy-efficient transport infrastructure resilience.
关键词 ：
Fire safety Fire safety Smoke extraction efficiency Smoke extraction efficiency Fire energy release Fire energy release Hybrid ventilation systems Hybrid ventilation systems Atrium-type underground metro station Atrium-type underground metro station
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| GB/T 7714 | Xu, Desheng , Li, Yanfeng , Du, Tianmei et al. Investigating the influence of outdoor temperature variations on fire-induced smoke behavior in an atrium-type underground metro station using hybrid ventilation systems [J]. | ENERGY , 2023 , 287 . |
| MLA | Xu, Desheng et al. "Investigating the influence of outdoor temperature variations on fire-induced smoke behavior in an atrium-type underground metro station using hybrid ventilation systems" . | ENERGY 287 (2023) . |
| APA | Xu, Desheng , Li, Yanfeng , Du, Tianmei , Zhong, Hua , Huang, Youbo , Li, Lei et al. Investigating the influence of outdoor temperature variations on fire-induced smoke behavior in an atrium-type underground metro station using hybrid ventilation systems . | ENERGY , 2023 , 287 . |
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摘要 ：
A cable fire in a utility tunnel can cause severe damage to the electric power supply in cities. This study aims to understand the combustion and flame spread characteristics of cable fires, which are mainly caused by overheating from the excessive current at the interconnections of the cables under spontaneous combustion. Fire experiments were conducted in a 1:6 scale model of a utility tunnel to analyse the flame spread characteristics under different heat release rates (HRRs), vertical distances, and transverse distances. The findings of this study show that the total burning time of the cable fire increases as the cable diameter increases, and the HRR also shows an increasing trend. Additionally, the spatial location of the cable fire has a significant impact on the flame spread. The terms Hc* and Dc* are defined to characterize the flame height and a general prediction model of the dimensionless flame height influenced by cable spontaneous combustion is proposed. A dimensionless model is also established to describe the flame spread rate. This research provides valuable guidance to aid in the development of fire safety measures in utility tunnels.
关键词 ：
Combustion characteristics Combustion characteristics Spread rate Spread rate Cable fire Cable fire Flame height Flame height Utility tunnel Utility tunnel
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| GB/T 7714 | Xu, Desheng , Li, Yanfeng , Li, Jiaxin et al. Evaluating the combustion and flame extension characteristics of cable fire in utility tunnels with spontaneous combustion scenarios: An experimental study [J]. | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2023 , 140 . |
| MLA | Xu, Desheng et al. "Evaluating the combustion and flame extension characteristics of cable fire in utility tunnels with spontaneous combustion scenarios: An experimental study" . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY 140 (2023) . |
| APA | Xu, Desheng , Li, Yanfeng , Li, Jiaxin , Zhong, Hua , Li, Junmei , Tu, Dengkai et al. Evaluating the combustion and flame extension characteristics of cable fire in utility tunnels with spontaneous combustion scenarios: An experimental study . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2023 , 140 . |
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摘要 ：
This research aims to establish a series of small-scale experiments to analyze the effect of ramp slopes on the temperature distribution of Liquefied Petroleum Gas (LPG) fire in a model branched tunnel under longitudinal ventilation. The heat release rate under experimental conditions reached 2.57 kW to 7.70 kW and five ramp slopes of 0 %, 3 %, 5 %, 7 % and 9 % were conducted. For a specific given bifurcation angle, the maximum exceedance temperature of the fire in the expanding region before the bifurcation angle is measured and ana- lysed. Results show that the maximum exceedance temperature in the main tunnel increases as the ramp slope decreases, which is mainly because the stack effect enhances the entrainment of the air and accelerates the smoke flow. Furthermore, the modified model of the maximum exceedance temperature, which could consider the influence of ramp slope for a branch tunnel fire is established according to the experimental results. The pre- dicted results agree well with those of the experimental study for the main tunnel. The results could provide a reference and contribute to the knowledge of smoke extraction strategies designed for branched tunnels.
关键词 ：
Ramp slopes Ramp slopes Longitudinal ventilation Longitudinal ventilation Maximum exceedance temperature Maximum exceedance temperature Branched tunnels Branched tunnels
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| GB/T 7714 | Li, Jiaxin , Li, Yanfeng , Li, Junmei et al. Experimental analysis of the effect of the ramp slopes on the maximum exceedance temperature in a branched tunnel fire [J]. | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2023 , 131 . |
| MLA | Li, Jiaxin et al. "Experimental analysis of the effect of the ramp slopes on the maximum exceedance temperature in a branched tunnel fire" . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY 131 (2023) . |
| APA | Li, Jiaxin , Li, Yanfeng , Li, Junmei , Zhong, Hua , Zhao, Jianlong , Xu, Desheng . Experimental analysis of the effect of the ramp slopes on the maximum exceedance temperature in a branched tunnel fire . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2023 , 131 . |
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摘要 ：
本发明为一种用于隧道火灾烟气控制的智能型重点排烟方法和系统，该系统包括火灾监测单元、环境参数检测单元、信号传输设备、智能运算模块、控制中心计算机等。本发明通过检测隧道内发生火灾时，起火点上方顶棚处的最高温度，将信号传输至控制中心的计算机，利用智能运算模块进行运算得到该规模火灾的实时热释放率，通过智能运算模块中的数据库调用适合当前火灾的排烟策略，进一步控制排烟系统排烟阀开启面积或者排烟阀开启策略，并依据排烟口实际开启面积对排烟变频风机的频率来调整排烟量，其中排烟阀开启面积通过开度可调的电动排烟阀自动控制，风机的排烟量通过改变变频风机的转动频率调整，从而将隧道内蔓延的烟气控制在有效的范围内。
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| GB/T 7714 | 李俊梅 , 刘文博 , 李炎锋 et al. 一种用于隧道火灾烟气控制的智能型重点排烟方法和系统 : CN202210673328.4[P]. | 2022-06-15 . |
| MLA | 李俊梅 et al. "一种用于隧道火灾烟气控制的智能型重点排烟方法和系统" : CN202210673328.4. | 2022-06-15 . |
| APA | 李俊梅 , 刘文博 , 李炎锋 , 涂登凯 , 李嘉欣 , 齐兆 et al. 一种用于隧道火灾烟气控制的智能型重点排烟方法和系统 : CN202210673328.4. | 2022-06-15 . |
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