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学者姓名：余龙星
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Abstract ：
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 等. "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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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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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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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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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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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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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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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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Ullage height (the distance between the fuel surface and the pool upper rim) is one of the most important and widely recognized factors that affect the burning rate and heat transfer of pool fires. This study investigated the effects of ullage height on the burning rate, heat feedback, and radiation fraction of medium-scale pool fires. Heptane pool fires were tested with a diameter (D) of 30 cm and the non-dimensional ullage height (h/D, h is the ullage height) being varied from 0 to 1.48. Results show that the non-dimensional burning rate tends to decrease exponentially with h/D. It has been proved that the current models used to predict the burning rate of pool fires are not applicable to those medium-scale pool fires that are affected by the ullage height. The radiative, conductive, and convective heat feedback rate overall decrease with the ullage height. The conductive heat feedback fraction weakly depends on h/D. The radiative heat feedback fraction firstly decreases then stabilizes with h/D, while the convective heat feedback fraction shows an opposite trend. The radiative fractions firstly increase then decrease with h/D. This paper presents a new correlation with considering the ullage height and the mean beam length within the pool ullage. The universality and accuracy of the proposed model were verified by comparing it with extensive experimental data, where D varied from 10 cm to 35 cm, and h/D varied from 0 to 2.0.
Keyword ：
Burning rate Burning rate Heat transfer Heat transfer Mean beam length Mean beam length Medium-scale pool fire Medium-scale pool fire Ullage height Ullage height
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| GB/T 7714 | Liu, Chunxiang , Yin, Zhongyu , Zhang, Hao et al. Experimental study of ullage height on the burning rate and heat transfer of medium-scale heptane pool fires [J]. | INTERNATIONAL JOURNAL OF THERMAL SCIENCES , 2023 , 197 . |
| MLA | Liu, Chunxiang et al. "Experimental study of ullage height on the burning rate and heat transfer of medium-scale heptane pool fires" . | INTERNATIONAL JOURNAL OF THERMAL SCIENCES 197 (2023) . |
| APA | Liu, Chunxiang , Yin, Zhongyu , Zhang, Hao , Huang, Ping , Yang, Fuqiang , Zeng, Fanjie et al. Experimental study of ullage height on the burning rate and heat transfer of medium-scale heptane pool fires . | INTERNATIONAL JOURNAL OF THERMAL SCIENCES , 2023 , 197 . |
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