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Simulation of steel beam under ceiling jet based on a wind–fire–structure coupling model

Frontiers of Structural and Civil Engineering 2023年第1期17卷 78-98页

作者： Jinggang ZHOU Xuanyi ZHOU beihua cong Wei WANG Ming GU State Key Laboratory of Disaster Reduction in Civil Engineering Tongji UniversityShanghai 200092China Shanghai Institute of Disaster Prevention and Relief Tongji UniversityShanghai 200092China

For localized fires, it is necessary to consider the thermal and mechanical responses of building elements subject to uneven heating under the influence of wind. In this paper, the thermomechanical phenomena experienced by a ceiling jet and I-beam in a structural fire were simulated. Instead of applying the concept of adiabatic surface temperature (AST) to achieve fluid–structure coupling, this paper proposes a new computational fluid dynamics–finite element method numerical simulation that combines wind, fire, thermal, and structural analyses. First, to analyze the velocity and temperature distributions, the results of the numerical model and experiment were compared in windless conditions, showing good agreement. Vortices were found in the local area formed by the upper and lower flanges of the I-beam and the web, generating a local high-temperature zone and enhancing the heat transfer of convection. In an incoming-flow scenario, the flame was blown askew significantly;the wall temperature was bimodally distributed in the axial direction. The first temperature peak was mainly caused by radiative heat transfer, while the second resulted from convective heat transfer. In terms of mechanical response, the yield strength degradation in the highest-temperature region in windless conditions was found to be significant, thus explaining the stress distribution of steel beams in the fire field. The mechanical response of the overall elements considering the incoming flows was essentially elastic.

关键词： CFD–FEM coupling steel beam wind ceiling jet numerical heat transfer

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Experimental Evaluation of Water Mist with Metal Chloride Additives for Suppressing CH_4 /Air Cup-Burner Flames

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Journal of Thermal Science 2013年第3期22卷 269-274页

作者： Jianghong Liu beihua cong Ocean Environmental and Engineering College Shanghai Maritime University Shanghai Institute of Disaster Prevention and Relief

In order to investigate the fire suppression effectiveness of water mist with metal chloride additives, ultrafine water mists of these salts with diameters about 10μm were introduced into CH4 /air non-premixed flame in the cup burner. Results showed that these droplets hard to make itself to the flame front under the cup burner flow conditions functioned as a carrier of the vaporized solid particles or its decomposed materials. The metal chloride improved fire suppression efficacy of water mist which were affected by the type and concentration of metal chloride. On a mass basis, there is a fire suppression effectiveness relationship of MgCl2

关键词： additive water mist fire suppression CH4 air fire

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Mechanisms of suppressing cup-burner flame with water vapor

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Science China(Technological Sciences) 2008年第8期51卷 1222-1231页

作者： cong beihua LIAO GuangXuan State Key Laboratory of Fire Science University of Science and Technology of ChinaHefeiAnhui 230026China Research Center for Combustion and Environmental Technology Shanghai Jiaotong UniversityShanghai 200030China

The mechanisms of suppressing a laminar methane-air co-flow diffusion flame formed on a cup burner with water vapor have been studied experimentally and numerically. The methane burned in a steel cup surrounded by a glass chimney. A mist generator produced fine droplets delivered though the glass chimney with air. These droplets were heated into water vapor when they went though the diffuser. The extinguishing limit was obtained by gradually increasing the amount of water vapor to replace the air in the coflowing oxidizer stream. Results showed that the agent concentration required for extinguishment was constant over a wide range of the oxidizer velocity, i.e., a so-called "plateau region". The measured extinguishing mass fractions of the agents were: (16.7 ± 0.6)% for H2O, (15.9 ± 0.6)% for CO2, and (31.9 ± 0.6)% for N2. The computation used the Fire Dynamics Simulator (FDS) de- veloped by the NIST. The numerical simulations showed that the predicted water vapor extinguishing limits and the flickering frequency were in good agreements with the experimental observations and, more importantly, revealed that the sup- pression of cup-burner flames occurred via a partial extinction mechanism (in which the flame base drifts downstream and then blows off) rather than the global extinction mechanism of typical counter-flow diffusion flames. And the flame-base oscillation just before the blow-off was the key step for the non-premixed flame extinction in the cup burner.

关键词： cup-burner flames water vapor extinguishing limit partial extinction

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Research on Fire Protection Planning Technology of Shanghai 2010 World Expo Site

Research on Fire Protection Planning Technology of Shanghai ...

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The 2011 International Conference on Advanced Materials and Information Technology Processing(AMITP 2011)

作者： Xin Han beihua cong Shanghai Institute of Disaster Prevention and Relief Tongji University Tongji Antai R&D Center of Engineering Disaster Prevention

Successful World Expo is first a safe Expo and a safe Expo needs reliable fire security. Based on the general requirement of planning and construction of Shanghai 2010 World Expo, through the analysis

ISBN: (纸本)9783037851579

关键词： Shanghai 2010 World Expo fire protection planning safety layout fire protection facility Fire Fire safety disaster prevention Fireproofing of buildings Technical standards

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CFD Simulation Analysis on Fire Feature of Tunnel with Different Sections of Smoke Outlet

CFD Simulation Analysis on Fire Feature of Tunnel with Diffe...

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The 2011 International Conference on Advanced Materials and Information Technology Processing(AMITP 2011)

作者： beihua cong Xin Han Jun Lin Shanghai Institute of Disaster Prevention and Relief Tongji University Tongji Antai R&D Center of Engineering Disaster Prevention

With regard to road tunnel fire situation, the smoke extraction system is very important for effective control of fire temperature as well as crowd safe evacuation. The section form of smoke outlet is

ISBN: (纸本)9783037851579

关键词： road tunnel fire smoke outlet smoke extraction system FDS simulation Smoke Simulation Analysis tunnel EXITS Power outlets FIREGROUND Flow rates mining system FIRING TEMPERATURE road tunnels Fire section forming

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发动机舱油雾着火及火蔓延特性的数值模拟

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航空动力学报 2023年第2期38卷 279-287页

作者：丁芳李松阳丛北华中国航发商用航空发动机有限责任公司上海200241 上海防灾救灾研究所上海200092

为研究发动机舱内典型火灾规律,采用大涡模拟技术,针对某型发动机核心机舱建立了油雾火的火灾模型,研究舱内着火及火蔓延规律,分析不同泄漏位置及泄漏孔朝向对火焰传播及温度、热流分布的影响。结果表明:在舱内的通风热环境下,油雾泄漏... 详细信息

为研究发动机舱内典型火灾规律,采用大涡模拟技术,针对某型发动机核心机舱建立了油雾火的火灾模型,研究舱内着火及火蔓延规律,分析不同泄漏位置及泄漏孔朝向对火焰传播及温度、热流分布的影响。结果表明:在舱内的通风热环境下,油雾泄漏会被引燃并稳定燃烧,中间有一定的潜伏期,火灾强度较大,破坏性严重;油雾火灾是典型的由通风控制的不充分燃烧过程,呈现一定的蔓延规律,火焰中心位于高速回流区,向引气口及尾部排气方向快速蔓延;不同泄漏位置及泄漏孔朝向对火灾的蔓延形态、温度及热流的分布有一定影响,其中泄漏位置对温度热流峰值影响较大,泄漏孔朝向对温度热流的分布影响较大。

关键词：油雾火火蔓延大涡模拟火灾特性发动机舱

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Experimental study on inhibition of low pressure premixed flat methane-oxygen flames by trifluoromethane

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Chinese Science Bulletin 2005年第14期50卷 1429-1434页

作者： cong beihua QI Fei LIAO Guangxuan KUANG Kaiqiang ZHOU Xiaomeng State Key Laboratory of Fire Science University of Science and Technology of China Hefei 230026 China National Synchrotron Radiation Laboratory University of Science andTechnology of China Hefei 230026 China

This paper presents measurements of combus- tion species of low pressure laminar premixed flat meth- ane-oxygen flames inhibited by trifluoromethane (CF3H) using synchrotron radiation-molecular beam mass spec- trometry (SR-MBMS). Fire suppression chemistry of CF3H is investigated by selective detection of combustion radicals and intermediates. Results show that SR-MBMS offers a powerful tool for studying fire suppression chemistry of ha- lon replacements, which may extensively detect combustion species in the inhibited flames, especially radicals and inter- mediates. The suppressant CF3H is completely consumed in the preheat zone of premixed flames and produces fluori- nated radicals such as CF3 and CF2. CF3 is the main radical participating in flame inhibition cycles in the reactive zone. Unlike HBr, HF produced by CF3H is very stable and will not act as a radical scavenger because the bond energy of H-F is much higher than that of H-Br, which is responsible for less effectiveness than conventional bromine-based sup- pressants.

关键词：火焰抑制三氟氯乙烯分子光谱测定术燃烧媒介

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Experimental studies on interaction of water mist with class K fires

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Chinese Science Bulletin 2006年第24期51卷 3053-3058页

作者： FANG Yudong ZHANG Yongfeng LIN Lin LIAO Guangxuan HUANG Xin cong beihua University of Science & Technology of China State Key Laboratory of Fire Science Hefei 230026 China

Interaction of water mist with cooking oil fires is studied experimentally and theoretically. A LDV/APV system is used to measure the velocity and diameter of water mist at different pressures in the experiments,and the effect of water mist velocity and diameter on fire extinguishment efficiency is investi-gated. The experimental results show that water mist has excellent surface cooling effect; it can control and extinguish cooking oil fires quickly without re-ignition. The critical temperature (Tfo) is calculated by energy balance equation,and the fire plume momentum is calculated and compared with that of water mist in order to determine the critical velocity (νwy) of fire extinguishment. This paper provides references for cooking oil fires extinguishment with water mist.

关键词：水雾 K级火灾食用油油类燃烧重新起火灭火效果

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全尺寸发动机模拟舱火灾特性试验及仿真研究

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燃烧科学与技术 2023年第1期29卷 76-84页

作者：李松阳丁芳崔振涛丛北华中国航发商用航空发动机有限责任公司先进技术研究部上海200241 同济大学上海防灾救灾研究所上海200092

针对民用航空发动机的防火需求,以民用涡扇发动机核心机舱作为参照对象,设计并搭建了全尺寸的模拟发动机舱火灾试验台.通过改变冷却气流量、火源类型与功率,研究了发动机核心机舱内的火灾特性.同时,采用开源火灾模拟软件FDS,仿真计算了... 详细信息

针对民用航空发动机的防火需求,以民用涡扇发动机核心机舱作为参照对象,设计并搭建了全尺寸的模拟发动机舱火灾试验台.通过改变冷却气流量、火源类型与功率,研究了发动机核心机舱内的火灾特性.同时,采用开源火灾模拟软件FDS,仿真计算了典型油雾火和油池火工况,并与试验结果进行了对比分析,研究了舱内火灾的发展及温度分布规律.在实验过程中,发现当火灾强度达到一定程度后,舱内会发生爆燃现象.通过构建舱内控制体的守恒方程,并进行理论分析,推测油气比和通风量是影响舱内爆燃发生与否的关键因素.最后,在此基础上拟合了爆燃发生的临界失稳条件.结果表明:在临界条件以上必然发生爆燃,而在其以下存在一个缓冲区,爆燃有一定概率发生.

关键词：航空发动机舱通风防火爆燃

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高压细水雾灭火系统应用于博物馆展厅的试验研究

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给水排水 2022年第6期48卷 92-98页

作者：苏昶明邹丽丛北华归祎杰同济大学建筑设计研究院(集团)有限公司上海200092 上海同泰火安科技有限公司上海201706 同济大学上海防灾救灾研究所上海200092 上海防灾救灾研究所上海200092

展厅类场所展示有珍贵的文物资料,一旦发生火灾,将导致无可估量的损失。细水雾系统因具有灭火效率高、用水量少、水渍损失少、环境污染小等优点得到了广泛应用。《细水雾灭火系统技术规范》(GB 50898-2013)未对展厅类场所的系统选型、... 详细信息

展厅类场所展示有珍贵的文物资料,一旦发生火灾,将导致无可估量的损失。细水雾系统因具有灭火效率高、用水量少、水渍损失少、环境污染小等优点得到了广泛应用。《细水雾灭火系统技术规范》(GB 50898-2013)未对展厅类场所的系统选型、分区面积、喷雾强度等要求进行规定,因此对展厅类场所系统选型、分区设计思路进行分析,随后针对分区面积、喷雾强度、喷头型号及间距等进行试验验证。试验研究了不同火源位置、不同开口状态及不同火源形式下细水雾系统的灭火效果,结果表明:试验选用的细水雾分区面积、喷雾强度、喷头型号及间距满足灭火要求,相关分析及试验结果将作为中国某博物馆临展厅的设计依据。

关键词：博物馆展厅高压细水雾灭火系统实体火灾试验

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