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学者姓名：余龙星
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Abstract ：
回燃是通风受限火灾在通风条件改变后可能出现的一种极端火行为.由于回燃对安全疏散和消防救援具有严重影响,分析回燃的发生及发展过程至关重要.文章基于1m×0.8m×0.6m的小尺寸实验平台开展了固体燃料腔室火灾回燃过程火场温度突变特性实验研究.通过对光学影像、红外热像仪和腔室内温度数据的分析,揭示了回燃发生过程中三个典型时刻(关门、开门、回燃/复燃)腔室内的温度分布规律.结果表明:腔室内的温度在竖直方向上具有较大温度梯度,在水平方向上,顶棚下方温度分布较为均匀,然而也呈现中心火源附近温度高四周温度低的规律,说明钢板墙体热量散失较为明显.此外,随着时间的推移,关门、开门以及回燃时刻腔体内部出现2次温度降低以及2次温度升高的过程,且垂直方向上温度梯度在关门后逐渐减小又在开门后增大.开门时刻至回燃时刻腔体内部温度差值越低,越难发生回燃.回燃的发生与热烟气及重力流的混合规模直接相关.
Keyword ：
回燃 回燃 小尺寸实验 小尺寸实验 温度分布 温度分布 腔室火灾 腔室火灾
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| GB/T 7714 | 宋欣宸 , 吕志龙 , 徐斌 et al. 回燃过程腔室温度演变特性实验研究 [J]. | 安全与健康 , 2025 , (1) : 57-63,68 . |
| MLA | 宋欣宸 et al. "回燃过程腔室温度演变特性实验研究" . | 安全与健康 1 (2025) : 57-63,68 . |
| APA | 宋欣宸 , 吕志龙 , 徐斌 , 余龙星 . 回燃过程腔室温度演变特性实验研究 . | 安全与健康 , 2025 , (1) , 57-63,68 . |
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该研究立足安全工程与控制工程专业的结合,研制了基于PID自动控制原理的隧道火灾智能空气幕防烟实验教学平台,可满足两个专业多门课程的理论与实验教学需求.该平台能形象地展示自动控制原理与传统空气幕相结合实现复杂火灾场景下智能防烟功能的效果.基于该平台的教学能够将理论知识、实验操作和数据分析相结合,提升了相关课程实验的质量和效果,提升了学生的创造思维和探索能力.
Keyword ：
PID控制 PID控制 实验教学平台 实验教学平台 空气幕 空气幕 跨学科融合 跨学科融合 隧道火灾 隧道火灾
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| GB/T 7714 | 余龙星 , 杨嘉瑞 , 陈寅楠 . 智能空气幕防烟实验平台设计与教学应用 [J]. | 实验技术与管理 , 2025 , 42 (2) : 177-184 . |
| MLA | 余龙星 et al. "智能空气幕防烟实验平台设计与教学应用" . | 实验技术与管理 42 . 2 (2025) : 177-184 . |
| APA | 余龙星 , 杨嘉瑞 , 陈寅楠 . 智能空气幕防烟实验平台设计与教学应用 . | 实验技术与管理 , 2025 , 42 (2) , 177-184 . |
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设计了一种火旋风模拟教学实验与理论课程相结合的创新教学方法,构建了"火旋风模拟与热危害特性"教学实验平台,将实验实践融入教学过程中.在该教学创新平台的支持下,学生将能够直接观察火焰在旋转涡流环境中的动态演变过程.此外,通过整合红外成像技术和辐射热流测量手段,不仅深化了学生对火旋风现象形成机制的理解,而且使得火焰温度变化及辐射强度的时空分布特征更加清晰直观地展现出来.教学设计结合学生分组协作与教师引导的模式,旨在深化学生对理论知识的掌握,同时提升其实际操作能力、团队合作精神及问题解决能力.通过充分发挥实验平台的优势,激发学生的创新思维,增强其综合素养和专业技能,为未来的职业发展和学术研究奠定了坚实的基础.
Keyword ：
实验实践课程 实验实践课程 教学创新 教学创新 火旋风实验平台 火旋风实验平台 火灾安全 火灾安全 燃烧原理 燃烧原理 燃烧学 燃烧学
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| GB/T 7714 | 刘春祥 , 印仲宇 , 余龙星 et al. 火旋风模拟与热危害特性实验教学探索 [J]. | 实验室研究与探索 , 2025 , 44 (4) : 162-166 . |
| MLA | 刘春祥 et al. "火旋风模拟与热危害特性实验教学探索" . | 实验室研究与探索 44 . 4 (2025) : 162-166 . |
| APA | 刘春祥 , 印仲宇 , 余龙星 , 黄萍 , 张永亮 . 火旋风模拟与热危害特性实验教学探索 . | 实验室研究与探索 , 2025 , 44 (4) , 162-166 . |
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Abstract ：
Fires often pose a major obstacle to process safety. How to detect fire earlier and obtain more detailed fire hazard information has become an important issue. Existing means of fire detection suffer from problems such as insufficiently detailed information. Therefore, with the combination of binocular stereo vision and U-net, this paper proposes a parallel network structure model to realize three-dimensional spatial localization and size measurement of flame. Two serials of experiments were designed for different fire scenarios covering solid fires (candle) and liquid fires (n-heptane) from different scales that may occur in city operations. In terms of flame pattern segmentation results, the precision of the method can be basically maintained at over 90 %. In terms of three-dimensional spatial localization of the flame, the MRE (Mean Relative Error) for both type of fires tested are mostly less than 15 % for a variety of parameters. In terms of size measurement of the flame, the MRE for both the height and the width of the flame was less than 18 %. The implementation of this method facilitates the acquisition of detailed quantitative data concerning flame, thereby aiding in the preservation of industrial safety and environmental protection during the occurrence of fires.
Keyword ：
Binocular stereo vision Binocular stereo vision Computer vision Computer vision Fire Fire Flame localization Flame localization U-net U-net
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| GB/T 7714 | Lin, Xiajun , Yu, Longxing , Liu, Chunxiang et al. An intelligent flame detection and information acquisition method for early fires: Achieving real-time fire spatial localization and dimension measurement [J]. | PROCESS SAFETY AND ENVIRONMENTAL PROTECTION , 2025 , 199 . |
| MLA | Lin, Xiajun et al. "An intelligent flame detection and information acquisition method for early fires: Achieving real-time fire spatial localization and dimension measurement" . | PROCESS SAFETY AND ENVIRONMENTAL PROTECTION 199 (2025) . |
| APA | Lin, Xiajun , Yu, Longxing , Liu, Chunxiang , Hong, Zhi , Zhang, Peiling , Huang, Ping . An intelligent flame detection and information acquisition method for early fires: Achieving real-time fire spatial localization and dimension measurement . | PROCESS SAFETY AND ENVIRONMENTAL PROTECTION , 2025 , 199 . |
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The impacts of cross wind and ullage height (distance between the fuel surface and the pool's upper edge, h) on the burning rate of medium-scale heptane pool fires were studied. Using a series of 30 cm diameter fuel pools, the study covered crosswind speeds (u) from 0 to 5 m/s and dimensionless ullage heights (h/D) from 0 to 1.48. It was found that the overall burning rate decreased with increasing ullage height. Comparing the experimental mass flux with prior model predictions, classical models were accurate only when ullage height was low (h/D ≤ 0.35), with deviation increasing as ullage height rose. The simulation revealed the formation of a strong clockwise recirculating vortex inside the cavity, with the flame body positioned inside the pool. Changes in ullage height and crosswind speed influenced the recirculation flow velocity (uc), affecting fuel vapor-air mixing, boundary layer development over the fuel surface, and heat/mass transfer between the plume and fuel body, leading to a higher burning rate. A new mass flux model based on momentum conservation within the pool was developed, addressing the limitations of classical models at high ullage heights and providing a valuable tool for energy safety and emergency planning. © 2025 Elsevier Ltd
Keyword ：
Air Air Boundary layers Boundary layers Fires Fires Flow velocity Flow velocity Heat convection Heat convection Heptane Heptane Lakes Lakes Mass transfer Mass transfer Momentum Momentum Vortex flow Vortex flow
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| GB/T 7714 | Yin, Zhongyu , Liu, Chunxiang , Jangi, Mehdi et al. Effects of cross wind and ullage height on the burning rate of medium-scale pool fires [J]. | Energy , 2025 , 334 . |
| MLA | Yin, Zhongyu et al. "Effects of cross wind and ullage height on the burning rate of medium-scale pool fires" . | Energy 334 (2025) . |
| APA | Yin, Zhongyu , Liu, Chunxiang , Jangi, Mehdi , Huang, Ping , Yu, Longxing . Effects of cross wind and ullage height on the burning rate of medium-scale pool fires . | Energy , 2025 , 334 . |
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Numerical investigation was carried out to study the ceiling gas temperature distribution under the combination effect of tunnel slope and longitudinal fire location in a naturally ventilated tunnel. Results show that in horizontal tunnel with fire located in the tunnel's longitudinal center, the ceiling gas temperature is symmetric distributing in upstream and downstream. With fire moves to the right (downstream) portal, the ceiling gas temperature in upstream tunnel decays faster than that in downstream, and vice versa. For inclined tunnels (going uphill), the ceiling gas temperature is asymmetrically distributed even the fire is located in the longitudinal center. Interestingly, with fire moves to downstream, it would become symmetric again and then it returns to asymmetric. Therefore, the tunnel slope and the longitudinal fire location have complex combination effect on the ceiling gas temperature distribution. More interestingly, with the fire moving from upstream to downstream in an uphill tunnel, the evolution of maximum ceiling gas temperature shows two tendencies, depending on the tunnel slopes. For smaller tunnel slopes, the maximum ceiling gas temperature first increases and then decreases, while it increases monotonically for larger tunnel slopes. Consequently, the critical tunnel slope for the change of two tendencies was proposed, which shows the variation of the relative strength of the two effects. For tunnel slopes lower than the critical value, the two effects are comparable. For tunnel slopes larger than the critical value, the tunnel slope is the dominant effect. In addition, the empirical equation of offset distance was proposed as intermediate variable to characterize the combination effects on the maximum ceiling gas temperature. By taking the absolute value of offset distance as characteristic parameter, the predicting equation for the maximum ceiling gas temperature was proposed.
Keyword ：
Inclined tunnel Inclined tunnel Longitudinal fire location Longitudinal fire location Maximum ceiling gas temperature Maximum ceiling gas temperature Offset distance Offset distance
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| GB/T 7714 | Yu, Longxing , Lei, Xiwen , Wang, Lingxiang et al. Numerical investigation on the maximum and longitudinal distribution of ceiling gas temperature in an inclined tunnel: The combination effect of tunnel slope and longitudinal fire location [J]. | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2025 , 163 . |
| MLA | Yu, Longxing et al. "Numerical investigation on the maximum and longitudinal distribution of ceiling gas temperature in an inclined tunnel: The combination effect of tunnel slope and longitudinal fire location" . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY 163 (2025) . |
| APA | Yu, Longxing , Lei, Xiwen , Wang, Lingxiang , Huang, Ping , Liu, Chunxiang . Numerical investigation on the maximum and longitudinal distribution of ceiling gas temperature in an inclined tunnel: The combination effect of tunnel slope and longitudinal fire location . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2025 , 163 . |
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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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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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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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| GB/T 7714 | Yu, Longxing , Chen, Yinnan , Chen, Shuo et al. Numerical analysis of the performance of a PID-controlled air curtain for fire-induced smoke confinement in a tunnel configuration (vol 141, 103930, 2023) [J]. | FIRE SAFETY JOURNAL , 2024 , 146 . |
| MLA | Yu, Longxing et al. "Numerical analysis of the performance of a PID-controlled air curtain for fire-induced smoke confinement in a tunnel configuration (vol 141, 103930, 2023)" . | FIRE SAFETY JOURNAL 146 (2024) . |
| APA | Yu, Longxing , Chen, Yinnan , Chen, Shuo , Zhang, Yuxuan , Zhang, Hao , Liu, Chunxiang . Numerical analysis of the performance of a PID-controlled air curtain for fire-induced smoke confinement in a tunnel configuration (vol 141, 103930, 2023) . | FIRE SAFETY JOURNAL , 2024 , 146 . |
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