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学者姓名：余龙星
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Abstract ：
CFD simulation tests were carried out to study the asymmetric flow phenomenon caused by the combination effect of tunnel slope and longitudinal fire location in a naturally ventilated tunnel. The result shows that the tunnel slope and the longitudinal fire location can both create the induced longitudinal flow solely. The longitudinal flow within tunnel induced by the stack effect caused by the tunnel slope is normally unidirectional, flowing uphill and the speed increases gradually with the tunnel slope. While the longitudinal flow induced by the thermal pressure difference caused by the uneven distribution of upstream and downstream smoke transportation can be bidirectional, which depends on the longitudinal fire location (also known as the downstream and upstream tunnel length difference, Delta L = L-down - L-up). Therefore, the induced longitudinal flow under the combination effect of tunnel slope and longitudinal fire location is very complex. For tunnels going uphill from left (upstream) to the right (downstream) portals, the two effects are positively added when the fire is located at the upstream tunnel (Delta L > 0), while the two effects are counteracted when the fire is located at the downstream (Delta L < 0). To quantify the strength of asymmetric flow caused by the two effects, an empirical equation of mass flow rate of induced longitudinal flow is proposed. Meanwhile, a model to predict the smoke back-layering length under the two effects is also proposed and validated by former experimental data. A prediction model on the upper critical fire position where the two effects are completely canceled out is proposed. Another critical position (the lower critical fire position) where the smoke flow can achieve unidirectional transportation in an inclined tunnel under natural ventilation conditions is deduced as well.
Keyword ：
Asymmetric flow effect Asymmetric flow effect Back-layering length Back-layering length Inclined tunnel Inclined tunnel Longitudinal fire location Longitudinal fire location Mass flow rate Mass flow rate
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| GB/T 7714 | Yu, Longxing , Lei, Xiwen , Huang, Ping et al. Study on the combination effect of tunnel slope and longitudinal fire location on the asymmetric flow fields in a naturally ventilated tunnel [J]. | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2024 , 146 . |
| MLA | Yu, Longxing et al. "Study on the combination effect of tunnel slope and longitudinal fire location on the asymmetric flow fields in a naturally ventilated tunnel" . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY 146 (2024) . |
| APA | Yu, Longxing , Lei, Xiwen , Huang, Ping , Liu, Chunxiang , Zhang, Hao , Yang, Fuqiang . Study on the combination effect of tunnel slope and longitudinal fire location on the asymmetric flow fields in a naturally ventilated tunnel . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2024 , 146 . |
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为了更有效地防控综合管廊电缆桥架火灾，在全尺寸综合管廊中开展了电缆桥架火灾试验，系统研究了电缆层数和卷吸条件对电缆桥架火灾烟气温度分布的影响。在电缆桥架附近垂直和水平布置一系列热电偶，分别用于测量管廊内垂直和顶棚水平温度分布。基于管廊内的垂直温度分布，揭示了火灾场景下管廊垂直温度分层规律。结果表明，管廊内发生电缆桥架火灾时，管廊内从上往下可以分为三部分：顶部射流层、中间热烟气过渡层和下部冷空气层。通过分析管廊不同端口的顶棚横向温度分布，发现顶棚温度在半封闭端的衰减速度比全封闭端更快，建立了考虑热释放速率和火源距离顶棚距离的全封闭端顶棚下方无量纲纵向温度分布模型。最后根据卷吸条件与顶棚最大温升的对应关系，发现整体火源功率越大的电缆桥架火灾受到侧壁和端壁的热反馈影响越强烈，针对不同卷吸条件下的电缆桥架火灾分别建立了顶棚最大温升预测模型。通过将模型预测值与试验值对比，发现模型误差在16%以内。
Keyword ：
卷吸受限 卷吸受限 安全工程 安全工程 烟气温度分布 烟气温度分布 电缆桥架火灾 电缆桥架火灾 综合管廊 综合管廊
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| GB/T 7714 | 黄萍 , 林煦东 , 刘春祥 et al. 不同受限条件下综合管廊电缆桥架火灾烟气温度分布特性研究 [J]. | 安全与环境学报 , 2024 , 24 (03) : 897-906 . |
| MLA | 黄萍 et al. "不同受限条件下综合管廊电缆桥架火灾烟气温度分布特性研究" . | 安全与环境学报 24 . 03 (2024) : 897-906 . |
| APA | 黄萍 , 林煦东 , 刘春祥 , 曾凡捷 , 林开虹 , 杨明理 et al. 不同受限条件下综合管廊电缆桥架火灾烟气温度分布特性研究 . | 安全与环境学报 , 2024 , 24 (03) , 897-906 . |
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Annular pool fires, frequently happened in chemical industries, have a significant influence on environmental pollution. Air pollution, greenhouse gas emissions, water pollution, and soil contamination are general ways of environmental hazards caused by the annular pool fires. This study built upon our previous study (Environ. Sci. Pollut. Res., 2023, 30(21): 59781-59792.), and extended to investigate the combustion and fire plume flow behaviors of annular pool fires, both with and without air entrainment through the hollow center of the annular pool. Results show that when there is no air entrainment through the hollow center, the low combustion intensity area at the plume's central axis gradually extends while the high combustion intensity area concentrates at higher places and the flame height increased by nearly 40% from a solid pool (Din/Dout = 0) to the annular pool (Din/Dout = 0.80). Additionally, the area with high combustion intensity is more concentrated at a higher position. The combustion of annular pool fires was found to be dominated by non-premixed diffusion combustion. The center of the annular pool fires is dominated by air prior to flame merging and by fuel vapor after the merging occurs. For annular pool fires with air entrainment through the center of the pool, the combustion intensity increases as Din/Dout at the plume base increases. And, the flame height decreased by nearly 25% as Din/Dout increases. Flame burning occurs both on the outside and inside of the plume, exhibiting a "double layer" combustion characteristic. It reveals that the combustion of the fire plume transitions to premixed diffusion combustion. The center of the annular pool fire is predominantly composed of air. Understanding and controlling annular pool fires can lead to new methods for remediating fuel spills, reducing pollution from combustion, and advancing research in fluid mechanics.
Keyword ：
Air entrainment Air entrainment Annular pool fire Annular pool fire Combustion mode Combustion mode Numerical simulation Numerical simulation Plume flow Plume flow
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| GB/T 7714 | Huang, Ping , Zhang, Rui , Liu, Chunxiang et al. Burning and plume flow behaviors of annular pool fires: with and without air entrainment through the pool center [J]. | ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH , 2024 , 31 (5) : 8012-8025 . |
| MLA | Huang, Ping et al. "Burning and plume flow behaviors of annular pool fires: with and without air entrainment through the pool center" . | ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH 31 . 5 (2024) : 8012-8025 . |
| APA | Huang, Ping , Zhang, Rui , Liu, Chunxiang , Wu, Xinyue , Chen, Dimin , Chen, Shanshan et al. Burning and plume flow behaviors of annular pool fires: with and without air entrainment through the pool center . | ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH , 2024 , 31 (5) , 8012-8025 . |
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The authors regret that we have identified some small mistakes (mainly due to the accidental presentation of results from an older FDS version) that do not affect any conclusions of the work but are deemed sufficiently important to require correction. We sincerely apologize for any inconvenience caused. Corrigendum Section 3: The first sentence ‘The CFD simulations have been performed with Fire Dynamic Simulator (Version 6.7.9).’ was corrected to ‘The CFD simulations have been performed with Fire Dynamic Simulator (Version 6.7.9), except for Group I in Table 1, which were obtained with FDS Version 6.7.0.’. Corrigendum Fig. 4: The result from FDS 6.7.0 is updated as follows. And the sentence ‘the delay time [Formula presented] = 3.9 s and the time constant T = 2.4 s can be obtained’ was corrected to ‘the delay time [Formula presented] = 3.800 s and the time constant T = 2.554 s can be obtained’.[Formula presented] Corrigendum Table 2: The title ‘Table 2 Summary of PID parameters in different HRRs’ was corrected to ‘Table 2 Summary of PID parameters in different HRRs (obtained from FDS Version 6.7.0)’. And the kd value of 10 kW fire was corrected to 1.265. Corrigendum Fig. 8: The legend of 10 kW fire (Green line) in the printed version (kp = 0.446, ki = 0.077, kd = 0.848) was taken by mistake, which should be kp = 0.872, ki = 0.150 and kd = 1.265. The green line in Fig. 8 is also updated as follows.[Formula presented] © 2024 Elsevier Ltd
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| GB/T 7714 | Yu, L. , Chen, Y. , Chen, S. et al. Corrigendum to “Numerical analysis of the performance of a PID-controlled air curtain for fire-induced smoke confinement in a tunnel configuration” [Fire Saf. J. 141 (2023) 103930] (Fire Safety Journal (2023) 141, (S0379711223001984), (10.1016/j.firesaf.2023.103930)) [未知]. |
| MLA | Yu, L. et al. "Corrigendum to “Numerical analysis of the performance of a PID-controlled air curtain for fire-induced smoke confinement in a tunnel configuration” [Fire Saf. J. 141 (2023) 103930] (Fire Safety Journal (2023) 141, (S0379711223001984), (10.1016/j.firesaf.2023.103930))" [未知]. |
| APA | Yu, L. , Chen, Y. , Chen, S. , Zhang, Y. , Zhang, H. , Liu, C. . Corrigendum to “Numerical analysis of the performance of a PID-controlled air curtain for fire-induced smoke confinement in a tunnel configuration” [Fire Saf. J. 141 (2023) 103930] (Fire Safety Journal (2023) 141, (S0379711223001984), (10.1016/j.firesaf.2023.103930)) [未知]. |
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After a fire occurs, it is imperative that people in danger evacuate as soon as possible. However, the current emergency plan based on the pre-established static exiting route is unable to considering the real-time fire scenario. In addition, the selection of evacuation routes significantly relies on the decision-maker's experiences. These issues seriously affect evacuation efficiency, decreasing the likelihood of survival. This paper developed an effective real-time evacuation guidance method that can automatically select the evacuation route in accordance with real-time fire scenarios. The model is established based on the on-policy learning algorithm SARSA (State-action-reward-state-action), an algorithm for learning a Markov decision process policy, which could mimic the decision-making of pedestrian behaviors in an emergency. In addition, two types of radar (exit radar and fire radar) are introduced into the SARSA algorithm to facilitate the wayfinding process, which formulated the so-called Radar-assisted SARSA (RSARSA). The results have shown that RSARSA can swiftly decide a safer evacuation route for pedestrians or crowd at arbitrary location. The convergence time of initial successful route planning is between 0.05 and 4.5 s under the tests in this paper. The evacuation route determined by this algorithm can well consider the fire, and timely avoid routes with potential dangerous. Moreover, RSARSA can flexibly respond to different fires under various heat release rates and development speeds. By applying this technology, fire evacuation can be guided by routes that are more attuned to the mindset of pedestrians. It can provide a good basis for route selection of crowd evacuation.
Keyword ：
Evacuation Evacuation Fire emergency Fire emergency On -policy Learning On -policy Learning Reinforcement learning Reinforcement learning Route decision Route decision
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| GB/T 7714 | Huang, Ping , Lin, Xiajun , Liu, Chunxiang et al. A real-time automatic fire emergency evacuation route selection model based on decision-making processes of pedestrians [J]. | SAFETY SCIENCE , 2024 , 169 . |
| MLA | Huang, Ping et al. "A real-time automatic fire emergency evacuation route selection model based on decision-making processes of pedestrians" . | SAFETY SCIENCE 169 (2024) . |
| APA | Huang, Ping , Lin, Xiajun , Liu, Chunxiang , Fu, Libi , Yu, Longxing . A real-time automatic fire emergency evacuation route selection model based on decision-making processes of pedestrians . | SAFETY SCIENCE , 2024 , 169 . |
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Pursuing the high-quality urbanisation and improving urban system reliability are the current goal of urban development. Urban resilience reflects the reliability of a city in coping with external and internal disturbances. Therefore, the urban system reliability can be quantified by assessing urban resilience. Simultaneously, urban resilience assessments can identify vulnerabilities that affect the urban system reliability. Based on this, targeted decisions are proposed to enhance the reliability, stability and safety of urban systems. This study constructs an assessment indicator system to quantitatively estimate the reliability of urban systems and develops a dynamic urban resilience assessment model by combining it with a dynamic network framework that accounts for time varying factors. The model estimates the urban system reliability from a resilience perspective and identifies vulnerabilities in urban resilience. The applicability of the model is verified using Fujian Province as a research case. The case study uses annual urban data from 2016 to 2021, which is outstanding in terms of data objectivity. The results provide important insights for practitioners and researchers in optimising urban resilience, improving urban system reliability and formulating urban development strategies.
Keyword ：
Dynamic Bayesian network Dynamic Bayesian network Multidimensional perspective Multidimensional perspective Resilience assessment Resilience assessment Urban resilience Urban resilience
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| GB/T 7714 | Chen, Xing-lin , Yu, Long-xing , Lin, Wei-dong et al. Urban resilience assessment from the multidimensional perspective using dynamic Bayesian network: A case study of Fujian Province, China [J]. | RELIABILITY ENGINEERING & SYSTEM SAFETY , 2023 , 238 . |
| MLA | Chen, Xing-lin et al. "Urban resilience assessment from the multidimensional perspective using dynamic Bayesian network: A case study of Fujian Province, China" . | RELIABILITY ENGINEERING & SYSTEM SAFETY 238 (2023) . |
| APA | Chen, Xing-lin , Yu, Long-xing , Lin, Wei-dong , Yang, Fu-qiang , Li, Yi-ping , Tao, Jing et al. Urban resilience assessment from the multidimensional perspective using dynamic Bayesian network: A case study of Fujian Province, China . | RELIABILITY ENGINEERING & SYSTEM SAFETY , 2023 , 238 . |
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针对高校实验室危险化学品管理中存在的化学药剂种类多、监管周期长、流转环节多、使用过程动态变化等问题，文章在分析实验室危险化学品全过程管理流程的基础上，构建了高校实验室危险化学品全过程管理Petri网模型。计算分析和仿真验证结果表明，该模型具有有界性、可达性、安全性和活性等特性，是合理且有效的，可为高校实验室危险化学品全过程管理体系和溯源体系构建提供支撑。
Keyword ：
Petri网 Petri网 PIPE软件 PIPE软件 全过程管理 全过程管理 危险化学品 危险化学品 高校实验室 高校实验室
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| GB/T 7714 | 阳富强 , 陈星霖 , 刘春祥 et al. 高校实验室危险化学品全过程管理Petri网模型及其应用 [J]. | 化工高等教育 , 2023 , 40 (03) : 92-99 . |
| MLA | 阳富强 et al. "高校实验室危险化学品全过程管理Petri网模型及其应用" . | 化工高等教育 40 . 03 (2023) : 92-99 . |
| APA | 阳富强 , 陈星霖 , 刘春祥 , 余龙星 . 高校实验室危险化学品全过程管理Petri网模型及其应用 . | 化工高等教育 , 2023 , 40 (03) , 92-99 . |
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如何高效学习?如何培养学生的学习兴趣?这些都是当前各高校教学改革过程中面临的巨大难题。为了满足燃烧学、流体力学与数值模拟等实验教学的需要，按照弗洛德相似准则，设计搭建了1∶10缩尺寸多功能隧道火灾实验平台。该实验平台能够模拟隧道中小汽车着火的过程，有助于教师直观地解释燃烧学课程中火灾动力学的抽象原理，说明流体力学课程中相似性原理的应用，并在数值模拟课程教学中为数值模拟结果提供实验验证数据，进而说明模拟和实验的可靠性。该实验平台还可通过调节隧道坡度，研究隧道坡度对烟气流动的影响，为隧道安全研究提供重要的理论基础和数据支撑。
Keyword ：
实验平台 实验平台 实验教学 实验教学 教学案例 教学案例 数值模拟 数值模拟 隧道火灾 隧道火灾
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| GB/T 7714 | 黄萍 , 朱宏儒 , 叶圣琳 et al. 隧道火灾模拟与实验在安全工程专业课程教学中的联合应用 [J]. | 化工高等教育 , 2023 , 40 (03) : 106-112 . |
| MLA | 黄萍 et al. "隧道火灾模拟与实验在安全工程专业课程教学中的联合应用" . | 化工高等教育 40 . 03 (2023) : 106-112 . |
| APA | 黄萍 , 朱宏儒 , 叶圣琳 , 陈寅楠 , 余龙星 . 隧道火灾模拟与实验在安全工程专业课程教学中的联合应用 . | 化工高等教育 , 2023 , 40 (03) , 106-112 . |
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Annular fire source is a common combustion form in fire accidents. Effects of D-in/D-out (the ratio of inner to outer diameters of the floating-roof tank) on the flame morphology and plume entrainment mechanisms of annular pool fires were studied by numerical simulation. Results show, as D-in/D-out increases, the area with low combustion intensity near the central axis of the pool surface gradually increases. Combined with the time-series HRR and the stoichiometric mixture fraction line of the fire plume, it reveals that the combustion of annular pool fire is dominated by non-premixed diffusion flame. The pressure near the pool outlet decreases with D-in/D-out, while the plume turbulence presents an opposite trend. Based on the time-sequential plume flow and the gas-phase material distribution data, the flame merging mechanism of the annular pool fires is revealed. Furthermore, based on the similarity criterion, it verifies that the applicability of the above scaled simulation conclusions could also be extended to guide full-scale fires.
Keyword ：
Annular pool fire Annular pool fire Flame merging Flame merging Full-scale simulation Full-scale simulation Non-premixed combustion Non-premixed combustion Numerical simulation Numerical simulation Plume flow Plume flow
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| GB/T 7714 | Huang, Ping , Zhang, Rui , Yu, Longxing et al. Study on the combustion, entrainment, and plume flow behaviors of annular pool fires [J]. | ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH , 2023 , 30 (21) : 59781-59792 . |
| MLA | Huang, Ping et al. "Study on the combustion, entrainment, and plume flow behaviors of annular pool fires" . | ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH 30 . 21 (2023) : 59781-59792 . |
| APA | Huang, Ping , Zhang, Rui , Yu, Longxing , Liu, Chunxiang . Study on the combustion, entrainment, and plume flow behaviors of annular pool fires . | ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH , 2023 , 30 (21) , 59781-59792 . |
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根据燃烧学、化工安全课程的教学实验需要，设计开发了不同边缘高度油池火传热和烟气分析教学实验平台。该平台主要由可变边缘高度燃烧系统、多元化传热测量系统及三段一体式烟气测量系统三部分组成。该平台能够模拟现实油池内由燃料被逐渐消耗所导致的油池边缘高度（燃料液面与油池上边缘的距离）不断增加的燃烧行为，同时还能获取燃料消耗速率、热反馈与燃烧产物等表征燃烧特性的数据。通过该实验平台，学生可以了解边缘高度影响下油池火产烟特性和热反馈机制，加深对油池火灾燃烧机理的认识，提高动手实践能力和创新能力。
Keyword ：
教学实验平台 教学实验平台 油池火 油池火 烟气分析 烟气分析 热反馈 热反馈 边缘高度 边缘高度
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| GB/T 7714 | 刘春祥 , 刘声涛 , 余龙星 et al. 不同边缘高度油池火传热和烟气分析教学实验平台 [J]. | 实验技术与管理 , 2023 , 40 (03) : 179-184 . |
| MLA | 刘春祥 et al. "不同边缘高度油池火传热和烟气分析教学实验平台" . | 实验技术与管理 40 . 03 (2023) : 179-184 . |
| APA | 刘春祥 , 刘声涛 , 余龙星 , 黄萍 , 黄俊清 , 张钰 et al. 不同边缘高度油池火传热和烟气分析教学实验平台 . | 实验技术与管理 , 2023 , 40 (03) , 179-184 . |
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