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Advanced Analysis Techniques in the Design of Longitudinal Tunnel Ventilation System Using Jet Fans

机译:射流风机纵向隧道通风系统设计中的先进分析技术

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摘要

Application of jet fans in emergency tunnel ventilation, as an economically attractive alternative to traditional fan plants, has become more popular in the US over the past years. Also, recent literature indicates that transportation tunnels are facing increased fire loads. For example the latest (2008) Edition of the NFPA 502, Standard for Road Tunnels, Bridges, and Other Limited Access Highways, indicates peak Fire Heat-Release Rate (FHRR) of 200-300 MW (683 - 1025 MBtu/hr) for tankers carrying flammable and combustible liquids. This is two to three times the values reported in the 2004 Edition of the same standard. Larger design FHRR increases the need for accuracy in accounting for the heat loads on the emergency ventilation equipment such as jet fans in order to avoid significant over design of these equipment and demonstrate their feasibility. Fortunately, this trend continues to grow parallel to reduced cost of computational power. Therefore, it is inevitable that more sophisticated computational analysis tools are used in the analysis of jet fan performance under fire emergency conditions with large design fire sizes of order 100MW. This paper presents a case study, where the three dimensional CFD analysis is used in conjunction with one dimensional SES analysis in order to establish the jet fan configuration and demonstrate performance/compliance of jet fans for the emergency ventilation requirements of a road tunnel.
机译:在过去的几年中,喷气式风扇在紧急隧道通风中的应用在经济上具有吸引力,是传统风扇工厂的替代选择,在美国已变得越来越流行。另外,最近的文献表明运输隧道正面临着越来越大的火灾负荷。例如,最新的(2008)版本的NFPA 502,《公路隧道,桥梁和其他受限出入高速公路的标准》指出,最高火力释放速率(FHRR)为200-300 MW(683-1025 MBtu / hr),运送易燃和可燃液体的油轮。这是同一标准的2004版中报告的值的两到三倍。更大的设计FHRR增加了对计算紧急通风设备(如喷气风扇)上的热负荷的准确性的需求,以避免这些设备的过度设计并证明其可行性。幸运的是,这种趋势在降低计算能力成本的同时继续增长。因此,不可避免的是,在具有100MW量级的大设计火灾尺寸的火灾紧急情况下,将更复杂的计算分析工具用于分析喷气风扇的性能。本文介绍了一个案例研究,其中将三维CFD分析与一维SES分析结合使用,以建立射流风机配置并演示射流风机的性能/合规性,以满足道路隧道的紧急通风要求。

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  • 来源
    《ASHRAE Transactions》 |2011年第2011期|p.637-648|共12页
  • 作者

    Nader Shahcheraghi;

  • 作者单位

    Member ASHRAE and a Senior Program Director at AECOM, Oakland, CA;

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  • 正文语种 eng
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