2019 9th International Conference on Fire Science and Fire Protection Engineering (ICFSFPE)最新文献_第6页

Fire Spread in U-shaped Facade Structures in High-rise Buildings 高层建筑u型外立面结构火灾蔓延研究

2019 9th International Conference on Fire Science and Fire Protection Engineering (ICFSFPE) Pub Date : 2019-10-01 DOI: 10.1109/ICFSFPE48751.2019.9055840

Xiankun Wang, Yanqiu Chen

引用次数: 2

Study on Dispersion Characteristics of FK5112 Mixed with Inert Gas FK5112与惰性气体混合的分散特性研究

2019 9th International Conference on Fire Science and Fire Protection Engineering (ICFSFPE) Pub Date : 2019-10-01 DOI: 10.1109/ICFSFPE48751.2019.9055839

Haoran Xing, Song Lu, N. Tao, Rulin Liu

{"title":"Study on Dispersion Characteristics of FK5112 Mixed with Inert Gas","authors":"Haoran Xing, Song Lu, N. Tao, Rulin Liu","doi":"10.1109/ICFSFPE48751.2019.9055839","DOIUrl":"https://doi.org/10.1109/ICFSFPE48751.2019.9055839","url":null,"abstract":"New clean agent fire suppressant, Perfluoro-2-methyl-3-pentanone, also known as FK5112 or Novec 1230 has excellent environmental behavior and high efficiency, and has been considered as one of the most promising halon replacement extinguishing agents. However, its high boiling point and poor dispersibility has largely restricted further application. To address the issue, our present work proposes the novel method by introducing inert gas mixed with FK5112 to improve the agent dispersibility. The evaporation mechanism of FK5112 during the mixing has been demonstrated in detail, and the droplets evaporation time of FK5112 affected by the diameter, the partial pressure of vapor, and the diffusion coefficient of different inert gas is estimated. Our results show that the droplets size of FK5112 have significant effect on evaporation, as it takes only 0.076s for a 5µm droplet to completely evaporate in N2 even if the partial pressure is high(a=80%). After FK5112 has evaporated in the inert gas, dispersion properties of the binary agent have been calculated and discussed thoroughly. The precise equation to estimate the vapor pressure of FK5112 is selected and the relation with the boiling point, mixing ratio, and pressure of the binary agent is revealed. For the 20% mixing ratio of FK5112, the boiling point of the mixture can reach 8.49°C and for the 10% mixing ratio, the boiling temperature is -5.85°C, which shows mixing with inert gas could notably improve its dispersibility. Additionally, mixing ratio and droplets size of FK5112 have shown a great impact.","PeriodicalId":6687,"journal":{"name":"2019 9th International Conference on Fire Science and Fire Protection Engineering (ICFSFPE)","volume":"30 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90830029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Full-scale Experimental Study on Vertical Fire Spread Characteristics of Different Organic Insulation Systems 不同有机保温系统垂直火灾蔓延特性的全尺寸实验研究

2019 9th International Conference on Fire Science and Fire Protection Engineering (ICFSFPE) Pub Date : 2019-10-01 DOI: 10.1109/ICFSFPE48751.2019.9055823

Shoujiang Wang, Wei Cong, Yongzheng Yao, Yong Zhou, Xudong Cheng

引用次数: 0

Numerical Study on Suppression of Post-flashover Compartment Fire by Using Water Mist 水雾扑灭闪燃后隔室火灾的数值研究

2019 9th International Conference on Fire Science and Fire Protection Engineering (ICFSFPE) Pub Date : 2019-10-01 DOI: 10.1109/ICFSFPE48751.2019.9055792

Ye Chen, Pengfei Wang, Xuanya Liu

引用次数: 0

Characteristics and Mechanisms of Rod-Rod Electrode Gap Breakdown Induced by High-temperature and Clean Flame 高温清洁火焰诱导棒-棒电极间隙击穿的特性及机理

2019 9th International Conference on Fire Science and Fire Protection Engineering (ICFSFPE) Pub Date : 2019-10-01 DOI: 10.1109/ICFSFPE48751.2019.9055773

Jixiang Xu, Fei You, Wenhao Huangfu, Kai Shui, Songtao Zhou, Zonglin Fu

{"title":"Characteristics and Mechanisms of Rod-Rod Electrode Gap Breakdown Induced by High-temperature and Clean Flame","authors":"Jixiang Xu, Fei You, Wenhao Huangfu, Kai Shui, Songtao Zhou, Zonglin Fu","doi":"10.1109/ICFSFPE48751.2019.9055773","DOIUrl":"https://doi.org/10.1109/ICFSFPE48751.2019.9055773","url":null,"abstract":"In order to investigate influence of high-temperature and intense flames derived from real wildfires on air gap breakdown properties around high voltage transmission lines, a rod-rod electrode breakdown-discharge test system under clean flame conditions was developed. After igniting ethanol, the gap between two copper rod electrodes was adjusted from 3.0 to 8.0 cm above and into the bulk flame, and dynamic charge load (from 0 to 50 kV) was applied externally to electrodes at each gap distance until there occurred breakdown across air gap. Evolution waveform and data of leaked current and instantaneous breakdown were recorded during the breakdown and discharge processes. Results show that under condition of high-temperature flame (750.0 °C~850.0 °C), breakdown voltages decrease by 55.7 %~68.3 % and 78.6 %~82.9 % when the flame is not bridged and bridged between two electrodes compared with those in pure air atmosphere. Under the action of a certain portion of flame plasma, insulating strength of rod-rod gap decreases significantly compared with that of pure air, which indicates that the high-temperature flame has a great influence on the formation and development of streamer, and is easier to form discharge channels.","PeriodicalId":6687,"journal":{"name":"2019 9th International Conference on Fire Science and Fire Protection Engineering (ICFSFPE)","volume":"32 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77280768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tunnel Fire Suppression Tests with Water Mist Fire Extinguishing System Containing an Additive 含添加剂的水雾灭火系统的隧道灭火试验

2019 9th International Conference on Fire Science and Fire Protection Engineering (ICFSFPE) Pub Date : 2019-10-01 DOI: 10.1109/ICFSFPE48751.2019.9055853

Mingqiang Yan, Zejiang Zhang, Wei Liu, Yaqiang Jiang, Pingli Li, Meng Yang

引用次数: 1

Small Scale Experimental Study on Backdraft 回流的小尺度实验研究

2019 9th International Conference on Fire Science and Fire Protection Engineering (ICFSFPE) Pub Date : 2019-10-01 DOI: 10.1109/ICFSFPE48751.2019.9055838

Mingxuan Li, Xiujuan Mei, Bo Zhong, Chang-zheng Zhao, J. Xiong

引用次数: 1

Effect of States of Charge on the Burning Behaviors of Lithium ion Batteries 电荷状态对锂离子电池燃烧行为的影响

2019 9th International Conference on Fire Science and Fire Protection Engineering (ICFSFPE) Pub Date : 2019-10-01 DOI: 10.1109/ICFSFPE48751.2019.9055886

Lu-qing Rong, Xudong Cheng, Yangyang Fu

{"title":"Effect of States of Charge on the Burning Behaviors of Lithium ion Batteries","authors":"Lu-qing Rong, Xudong Cheng, Yangyang Fu","doi":"10.1109/ICFSFPE48751.2019.9055886","DOIUrl":"https://doi.org/10.1109/ICFSFPE48751.2019.9055886","url":null,"abstract":"The burning behaviors of 18650 type lithium ion batteries under various states of charge (SOCs) were investigated using a cone calorimeter under an incident heat flux of 50 kW/m2. Several parameters were measured, including heat release rate (HRR), time to ignition and concentration of toxic gases. The experimental results show that the peak HRR, concentration of CO2 and CO increase with the increasing SOCs, whereas the time to ignition, time to explosion and the released energy during the burning decrease. The 100 % SOC is the highest fire risk due to the most serious toxicity (CO concentration: 1500 ppm), the maximum HRR (2.78 kW) and the shortest time to ignition (43 s). Besides, the burning process of the lithium ion batteries with various SOCs could be divided into four phases and the SOCs show important influence on the combustion intensity. The HRR of the fully charged LIBs is fourth power of time, which is much higher than the time-squared fire model mentioned in NFPA for most combustibles. A correlation is developed to predict the peak HRR. This study could serve as a technical guide for safe storage, application, and transportation in lithium ion batteries.","PeriodicalId":6687,"journal":{"name":"2019 9th International Conference on Fire Science and Fire Protection Engineering (ICFSFPE)","volume":"18 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81479397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Experimental Research on Burning Rate of Methane Pool Fires by Insulation and Crosswinds 保温与侧风作用下甲烷池火灾燃烧速率的实验研究

2019 9th International Conference on Fire Science and Fire Protection Engineering (ICFSFPE) Pub Date : 2019-10-01 DOI: 10.1109/ICFSFPE48751.2019.9055826

Yixiang Zhang, Jianlu Zhu, Cunyong Song, Yuxing Li, Hui Han

{"title":"Experimental Research on Burning Rate of Methane Pool Fires by Insulation and Crosswinds","authors":"Yixiang Zhang, Jianlu Zhu, Cunyong Song, Yuxing Li, Hui Han","doi":"10.1109/ICFSFPE48751.2019.9055826","DOIUrl":"https://doi.org/10.1109/ICFSFPE48751.2019.9055826","url":null,"abstract":"In order to study the effect of wall insulation conditions and different airflows on burning rate of pool fires, a small-scale ethanol pool fire was conducted experimentally under three pool diameters and a certain lip height in a wind tunnel. The results showed that the non-monotonic mass loss rate decreases first and then increases with the increase of crosswinds at a certain lip height. The burning rate increases with the increased pool diameter of the non-insulated pool fires, while an opposite trend of burning rate was found in insulated pool fires at the same sizes. The dimensionless characteristics of Richard number presents the variation relationship between the buoyancy force and momentum during different airflows. The insulated liquid pool showed a higher burning rate than that in a non-insulated pool with the characteristic parameter of reciprocal of Richard number less than 2. With the value of Richard number continue increased, the burning rate in the insulated pool fires decreased due to the difference between the increased crosswind and heat transfer. The mass loss rate of pool fires without insulation increased with the increase of pool diameter, while an opposite trend was found in insulated pool fires at the same size. The experimental data supported to establish a ratio coefficient of burning rate with or without insulation under different crosswinds.","PeriodicalId":6687,"journal":{"name":"2019 9th International Conference on Fire Science and Fire Protection Engineering (ICFSFPE)","volume":"86 5 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86498613","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Spontaneous Ignition of Thermally Thin and Intermediate PMMA Exposed to Linearly Increasing Thermal Radiation 热薄和中等PMMA暴露在线性增加的热辐射下的自燃

2019 9th International Conference on Fire Science and Fire Protection Engineering (ICFSFPE) Pub Date : 2019-10-01 DOI: 10.1109/ICFSFPE48751.2019.9055870

Mingrui Zhang, Chunjie Zhai, Junhui Gong

{"title":"Spontaneous Ignition of Thermally Thin and Intermediate PMMA Exposed to Linearly Increasing Thermal Radiation","authors":"Mingrui Zhang, Chunjie Zhai, Junhui Gong","doi":"10.1109/ICFSFPE48751.2019.9055870","DOIUrl":"https://doi.org/10.1109/ICFSFPE48751.2019.9055870","url":null,"abstract":"Spontaneous ignition characteristics of thermally thin and thermally intermediate PMMA (polymethyl methacrylate) under linearly increasing heat flux (HF) are experimentally studied in this work utilizing a heating apparatus capable of flexibly controlling the radiation intensity. Ignition time, critical temperature, surface and in-depth temperatures of 1.5 and 6 mm PMMA at six sets of HFs were recorded in the tests. The corresponding measured values are estimated by numerical simulations considering the thermal decomposition of solid and insulation layer, and critical temperature is used as the ignition criterion. The results shown that the influences of insulation layer and solid pyrolysis on surface temperature are limited and significant, respectively. Thinner sample and larger HF growth rate lead to higher ignition temperature and shorter ignition time. Two stages are identified according to pyrolysis temperature prior to ignition. The measured critical temperature is 695.53 ± 16 K. Nonetheless, a more reasonable uncertainty range ± 30 K is suggested to interpret the variation of measured ignition time based on the simulation results.","PeriodicalId":6687,"journal":{"name":"2019 9th International Conference on Fire Science and Fire Protection Engineering (ICFSFPE)","volume":"86 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85874910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2