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Numerical investigation of leaking and dispersion of carbon dioxide indoor under ventilation condition

机译：通风条件下室内二氧化碳泄漏和扩散的数值研究

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摘要

Numerical simulation of continuous release and dispersion process of carbon dioxide in a ventilated room was carried out by FLUENT with Computational Fluid Dynamic (CFD) method. The validation of the simulation method was made by comparison of simulation results with experimental data. The concentration distribution of carbon dioxide indoor was investigated. The effect of the release rate, wind speed and obstacle on gas dispersion was analyzed. Results showed that at the beginning carbon dioxide moved to the top of room by the action of jet flow. Under the condition of wind, the concentration of carbon dioxide increased along the leeward. Over a period of time, the concentration of carbon dioxide indoor kept constant. Gas-detecting alarm device should be installed at the downwind position above the leaking hole. People should get away from the room before high concentration area forms. The concentration of carbon dioxide downwind decreased with increment of wind speed, while increased with increment of release rate. Vents or forced draft should be set to decrease the concentration of carbon dioxide. When there was obstacle behind the leaking source, a region of high concentration appeared in windward side of the obstacle. When designing the layout of industrial workshop, it is necessary to minimize the quantity of equipment indoor or put them near the wall, away from leakage sources.
机译：通过FLUENT采用计算流体动力学（CFD）方法对通风室内的二氧化碳连续释放和分散过程进行了数值模拟。通过将仿真结果与实验数据进行比较，对仿真方法进行了验证。研究了室内二氧化碳的浓度分布。分析了释放速率，风速和障碍物对气体扩散的影响。结果表明，在开始时，二氧化碳在射流的作用下移动到了房间的顶部。在风的条件下，二氧化碳的浓度沿风向增加。在一段时间内，室内二氧化碳的浓度保持恒定。气体探测报警装置应安装在泄漏孔上方的顺风位置。人们应在高浓度区域形成之前离开房间。顺风向的二氧化碳浓度随风速的增加而降低，而随释放速率的增加而增加。应设置通风孔或强制通风以降低二氧化碳的浓度。当泄漏源后面有障碍物时，障碍物的迎风面出现了一个高浓度区域。在设计工业厂房的布局时，有必要将室内设备的数量减至最少或将其放置在靠近墙壁的位置，并远离泄漏源。

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  • 来源
    《Energy and Buildings》 |2013年第11期|461-466|共6页
  • 作者

    Zhirong Wang; Yuanyuan Hu; Juncheng Jiang;

  • 作者单位

    Jiangsu Key Laboratory of Urban and Industrial Safety, Institute of Safety Engineering, Nanjing University ofTechnology, Nanjing 210009, China;

    Jiangsu Key Laboratory of Urban and Industrial Safety, Institute of Safety Engineering, Nanjing University ofTechnology, Nanjing 210009, China;

    Jiangsu Key Laboratory of Urban and Industrial Safety, Institute of Safety Engineering, Nanjing University ofTechnology, Nanjing 210009, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Room ventilation; Carbon dioxide; Release and dispersion; Wind; Obstacle; Releasing rate;

    机译：房间通风;二氧化碳;释放和分散;风;障碍;发行率;

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