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温晓玲: CFD and engineering model predictions for the overpressures in vented hydrogen explosions
发布日期:2018-05-10  字号:   【打印

报告时间:2018年5月14日(星期一)  15:30

报告地点:土木与水利工程学院515

  :温晓玲 教授

工作单位:英国华威大学  

举办单位:土木与水利工程学院 

报告人简介

温晓玲,英国华威大学工程系教授,博导,火灾和爆炸研究领域的世界知名专家。在火灾、气体爆炸、二氧化碳输送安全、氢安全等方面的研究取得了突出的研究成果,且成果受国际同行高度评价,被政府机构及英美多家跨国公司采用。发表近 200篇高水平学术论文,其中包括本领域国际顶级学术刊物 Combustion and Flame, Combustion Science and Technology, Fire Safety Journal, International Journal of Hydrogen Energy, Numerical Heat Transfer, International Journal of Heat and Mass Transfer, Journal of Loss Prevention in the Process Industry 等。近五年,Jennifer Wen承担科研课题多项,总经费4000多万元。还13次受邀作国际会议大会报告,6次特邀报告。被国际同行引用数百次。现任英国爆炸协会指导委员会委员、国际氢安全指导委员会委员、燃烧和火灾动力学国际会议科学委员会委员、乙炔气瓶灾后评估特别咨询专家组成员、国际氢安全科学委员会委员、国际火灾安全协会会员、爆炸动力学和反应系统国际会议科学委员会委员、国际氢能源期刊安全特刊首席编辑、中国科学技术大学《火灾科学》杂志编委、英国工程及物理科学基金会评委专家、欧盟基金会评委专家、比利时/卡塔尔/塞浦路斯/香港和德国基金会评委专家、美国能源部优异审查和同行评价特邀专家。曾任清华、香港城市大学及英国阿尔斯特大学客座教授,现任大连理工大学、武警学院客座教授。

报告简介

Vented deflagrations are one of the most common and simplest methods to reduce damages that might be caused to buildings and enclosures due to accidental explosions. This presentation will describe the recent work in my group concerning the development and evaluation of both computational fluid dynamics (CFD) and engineering models for the vented explosion phenomenon. 

On the CFD aspect, HyFOAM has been developed in house as a dedicated solver for vented hydrogen explosions within the frame of the open source CFD code OpenFOAM. The code uses the flame wrinkling combustion model for modelling turbulent deflagrations. Additional sub-models have been added to account for lean combustion properties of hydrogen-air mixtures. 

Various engineering models are available in the literature in the form of published papers, European and USA standards. However, none of these have been sufficiently validated for the vented explosions of hydrogen-air mixtures, especially for realistic explosion scenarios in the presence of obstacles. Hence, a new engineering model based on external cloud explosions (ECE) has been developed by my group. The ECE firstly calculates the external cloud formation. This parameter is then used to calculate the overpressures generated by the external cloud combustion and internal explosion while the later will be the vent opening pressure, which is an important design parameter. The model has also been extended to cover the vented explosions in the presence of obstacles by accounting for the increase in flame surface area due to the presence of obstacles. 

The presentation will show snapshots of results from the HyFOAM predictions. This will be followed by comparison of the overpressure predictions from the various engineering models, the HyFOAM code and the published test data involving hydrogen explosion in a 20-feet ISO container (Skjold et al., 2017a, 2017b).

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