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学者姓名：余龙星
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Abstract ：
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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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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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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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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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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Slope structures are commonly used in buildings, but such slope structures can exacerbate the rate of fire spread, complicate building fire safety and suppression, and lead to injuries, deaths, and property damage. Particularly, the thermal hazards posed by ambient wind on sloped fires remain unquantified. In this study, a propane burner was used to simulate the flame morphology behavior of a sloped building fire. 480 tests were conducted with varying aspect ratios (1 8) of the fire source, different ambient winds (0 m/s 3.5 m/s), and slope inclination angles (0 degrees 40 degrees). Results demonstrate that the flame length initially increases and then decreases with an increment in ambient wind velocity. Moreover, with an increased aspect ratio of the fire source (length-to-width ratio), the turning point at which the flame length peaks shift to occur at a lower wind velocity threshold. The tilt angle and height of the flame change (respectively increases and decreases) significantly at lower ambient wind speeds and they tend to asymptotically approach respective constant values. As the ambient wind is further promoted. Existing physical models of flame morphology do not consider the combined effects of fire source aspect ratio, slope inclination angle, and ambient wind. A new slope entrainment restriction factor (EF) was proposed based on an analysis of the upward and leeward entrainment volumes. Using this factor, new models for flame morphology (including flame length, flame tilt angle, and flame height) were established. The accuracy and generalizability of the new flame models have been validated using reference data.
Keyword ：
Ambient wind Ambient wind Aspect ratio Aspect ratio Entrainment restriction factor ( EF ) Entrainment restriction factor ( EF ) Flame morphology Flame morphology Slope building fire Slope building fire
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| GB/T 7714 | Liu, Chunxiang , Lai, Tairun , Huang, Ping et al. Experimental study of flame morphology in slope buildings under the influence of aspect ratio and ambient wind [J]. | JOURNAL OF BUILDING ENGINEERING , 2024 , 98 . |
| MLA | Liu, Chunxiang et al. "Experimental study of flame morphology in slope buildings under the influence of aspect ratio and ambient wind" . | JOURNAL OF BUILDING ENGINEERING 98 (2024) . |
| APA | Liu, Chunxiang , Lai, Tairun , Huang, Ping , Bi, Yubo , Yu, Longxing . Experimental study of flame morphology in slope buildings under the influence of aspect ratio and ambient wind . | JOURNAL OF BUILDING ENGINEERING , 2024 , 98 . |
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High-quality fire image is essential for fire detection and monitoring. Degraded fire images in the fire field aggravate the difficulties in determining the burning area and assessing the severity of the fire, thus being unable to make scientific firefighting strategies. Therefore, a fire image enhancement model of multi-segment resolution structure, designed to implement image enhancement step by step, is proposed to solve the problem of low-resolution and detail reconstruction. Through testing samples by both the experimental and simulated datasets, the experimental results show that the model significantly improved image quality, with the peak signal-to-noise ratio increasing by 140.66% in the experimental dataset and by 3242.67% in the simulated dataset, while the structural similarity index measurement increased by 525.90% and 3090.07%, respectively. These enhancements led to an 85% improvement in the recognition accuracy of the fire detection model in the experimental dataset and a 55% improvement in the simulated dataset. The model also exhibited strong robustness, effectively restoring flame contours in images with varying smoke concentrations and fire sizes, suggesting its potential for application in complex fire scenarios. The proposed method illustrates the effectiveness of the multi-segment resolution structure in enhancing fire images, providing a novel approach to improving fire monitoring quality. The fire image enhancement method based on artificial intelligence has far-reaching significance for advancing the informatization and intelligence of fire protection.
Keyword ：
Fire monitoring Fire monitoring Generative adversarial networks Generative adversarial networks Image enhancement Image enhancement Multi-segment resolution Multi-segment resolution Resolution reconstruction Resolution reconstruction
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| GB/T 7714 | Hong, Zhi , Chen, Ming , Chen, Kexin et al. Fire image enhancement method based on generative adversarial networks for improving fire detection performance through cameras [J]. | JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY , 2024 . |
| MLA | Hong, Zhi et al. "Fire image enhancement method based on generative adversarial networks for improving fire detection performance through cameras" . | JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY (2024) . |
| APA | Hong, Zhi , Chen, Ming , Chen, Kexin , Lin, Xiajun , Zhang, Peilin , Liu, Chunxiang et al. Fire image enhancement method based on generative adversarial networks for improving fire detection performance through cameras . | JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY , 2024 . |
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This research utilizes machine learning methods to forecast the complex, non-linear thermal phenomena, along with heat transfer mechanisms, that influence the burning rate of pool fires, especially with changes in ullage height. Experiments involving pool fires were systematically designed and carried out, incorporating different diameters and ullage heights. Heptane was used as the representative alkane fuels. A dataset containing more than 70,000 sets of data was created as a training dataset for training the Backpropagation Neural Network (BPNN) and Support Vector Regression (SVR) models. During the optimization of machine learning model parameters, this study is based on Particle Swarm Optimization (PSO) with the principle of intelligent optimization to efficiently and accurately screen and optimize the key parameters of the model. The combustion duration, pool dimensions, and non-dimensional ullage height were input into a machine-learning model to predict the burning rate. By comparing against experimental data, the model was found to be able to predict the dynamic evolution of the burning rate of the pool fire in a real-time manner. The SVR model demonstrates greater predictive accuracy in comparison to the BPNN model, and the relative prediction error remains within +/- 20 %, which fully proves its effectiveness and generalization ability in the prediction of pool fire burning rate. The insights gained will offer substantial scientific backing for enhanced fire monitoring systems, while highlighting the capability of advanced machine learning methodologies to predict the intricate, real-time thermal dynamics and heat transfer characteristics of burning liquid fuels.
Keyword ：
Backpropagation Neural Network Backpropagation Neural Network Burning rate Burning rate Machine learning Machine learning Pool fire Pool fire Support Vector Regression Support Vector Regression
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| GB/T 7714 | Gao, Chaolan , Ji, Wei , Wang, Jiyun et al. Real-Time prediction of pool fire burning rates under complex heat transfer effects influenced by ullage height: A comparative study of BPNN and SVR [J]. | THERMAL SCIENCE AND ENGINEERING PROGRESS , 2024 , 56 . |
| MLA | Gao, Chaolan et al. "Real-Time prediction of pool fire burning rates under complex heat transfer effects influenced by ullage height: A comparative study of BPNN and SVR" . | THERMAL SCIENCE AND ENGINEERING PROGRESS 56 (2024) . |
| APA | Gao, Chaolan , Ji, Wei , Wang, Jiyun , Zhu, Xianli , Liu, Chunxiang , Yin, Zhongyu et al. Real-Time prediction of pool fire burning rates under complex heat transfer effects influenced by ullage height: A comparative study of BPNN and SVR . | THERMAL SCIENCE AND ENGINEERING PROGRESS , 2024 , 56 . |
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This paper investigates the radiative heat flux of annular pool fires under cross airflow (0-5 m/s), a configuration that has been underexplored in fire safety research despite its relevance in industrial fire hazards. Results show that radiative heat flux decreases with increasing distance from the fire source but increases with higher cross airflow speeds and larger annular pool diameters ( D in / D out ). Existing models overestimate radiative heat flux in annular pool fires due to the underrepresented hollow flame region. A new modified triangular prism radiation model was developed based on the similarity criterion of annular pool fires. An extensive comparative analysis was further conducted, encompassing a wide array of experimental configurations documented in the literature, characterized by varying diameters spanning from 0.1 m to 0.7 m and cross wind velocity ranges extending from 0 m/s up to 5 m/s. The results of this comprehensive examination reveal a good agreement between the newly established model and the empirical data, thereby substantiating the model's universal applicability and robust reliability. The new model will effectively assist industrial facilities in enhancing fire safety design, strengthening thermal hazard prevention and control, and ensuring a higher level of fire safety design.
Keyword ：
Annular pool fire Annular pool fire Cross airflow Cross airflow Flame radiation temperature Flame radiation temperature Modified triangular prism radiation model Modified triangular prism radiation model Radiative heat flux Radiative heat flux
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| GB/T 7714 | Liu, Chunxiang , Yin, Zhongyu , Jangi, Mehdi et al. Experimental study on radiative heat flux from annular pool fires under the cross airflow [J]. | APPLIED THERMAL ENGINEERING , 2024 , 260 . |
| MLA | Liu, Chunxiang et al. "Experimental study on radiative heat flux from annular pool fires under the cross airflow" . | APPLIED THERMAL ENGINEERING 260 (2024) . |
| APA | Liu, Chunxiang , Yin, Zhongyu , Jangi, Mehdi , Zhu, Xianli , Liu, Yangpeng , Zhang, Rui et al. Experimental study on radiative heat flux from annular pool fires under the cross airflow . | APPLIED THERMAL ENGINEERING , 2024 , 260 . |
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