• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Aerodynamics and ventilation of tunnels. >Fire loads and their influence on ventilation design A simple model for use in regulations
【24h】

Fire loads and their influence on ventilation design A simple model for use in regulations

机译：火灾负荷及其对通风设计的影响法规中使用的简单模型

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The consideration of a fire case in the design of a ventilation system is a standard requirement for any tunnel installation. The 'magic number' in this context is the heat release rate. In many countries a number of 30 MW is used, as this is taken to represent an average heavy goods vehicle under fire. Fire incidents in tunnels and full scale testing encouraged some groups to increase this number up to 100 MW, or even higher. In 1999 PIARC defined (and confirmed in 2004) that a heat release rate of 30 to 50 MW and a smoke production rate of 80 to 120 m~3/s are feasible. Not withstanding the fact that recent full scale tests were performed with heat release rates quite above the 100 MW line the general trend is to retain smaller heat release rates for design purposes, and to cover special cases for tunnels with higher risk by implementing other risk reducing or mitigating measures.rnWhen speaking about heat release rates, other parameters such as duration of the fire, heat loss due to radiation, and smoke production rate, are also important. However, many national and international regulations or guidelines on ventilation design ignore such parameters and focus only on the values for heat release rates alone. This leads to an unfavourable situation in that it is left to the designer to decide how to take the various parameters into account. To date and to our knowledge only Switzerland and Austria have attempted to address this issue. By relating the interpretation of heat release rates they have managed to produce parameters which allow for calculation of buoyancy forces in a defined and replicable way.rnCurrent applications have shown that especially when designing ventilation systems for complex tunnels with longitudinal ventilation, the Austrian method for calculating the buoyancy forces entails several limitations. In order to improve matters in this respect, a review of the Austrian method was performed. Based on three-dimensional calculations for tunnels with varying cross sections and heat release rates, adequate parameters were defined. These allow for calculation of buoyancy forces in one-dimensional approaches in a quick and reliable way. This paper deals with the physical background of the model and the derivation of the corresponding parameters.
机译：通风系统设计中考虑火灾情况是任何隧道安装的标准要求。在本文中，“魔术数”是放热率。在许多国家中，使用了30兆瓦的电量，因为这代表着着火的平均重型货车。隧道中的火灾事故和全面测试鼓励一些小组将这一数字提高到100兆瓦甚至更高。 PIARC在1999年定义（并在2004年确认），放热速率为30至50 MW，烟雾产生速率为80至120 m〜3 / s是可行的。尽管最近进行了全面测试，放热率远高于100 MW线路，但总体趋势是为设计目的保留较小的放热率，并通过实施其他降低风险的措施来涵盖高风险隧道的特殊情况在谈论放热率时，其他参数（例如着火持续时间，辐射造成的热损失和烟雾产生率）也很重要。但是，许多有关通风设计的国家和国际法规或指南都忽略了这些参数，而仅关注放热率的值。这导致了不利的情况，因为由设计者来决定如何考虑各种参数。迄今为止，据我们所知，只有瑞士和奥地利试图解决这一问题。通过将放热率的解释联系起来，他们设法产生了可以以定义的和可重复的方式计算浮力的参数。当前的应用表明，特别是在设计具有纵向通风的复杂隧道的通风系统时，奥地利的计算方法浮力受到一些限制。为了改进这方面的问题，对奥地利方法进行了回顾。基于具有不同横截面和放热率的隧道的三维计算，定义了足够的参数。这些允许以快速，可靠的方式以一维方法计算浮力。本文讨论了模型的物理背景以及相应参数的推导。

著录项

  • 来源
  • 会议地点 Dundee(GB)
  • 作者

    P Sturm; M Bacher; M Beyer; B H?pperger; J Croll;

  • 作者单位

    Graz University of Technology, Institute for Internal Combustion Engines and Thermodynamics, Austria;

    Graz University of Technology,Institute for Internal Combustion Engines and Thermodynamics, Austria;

    Graz University of Technology,Institute for Internal Combustion Engines and Thermodynamics, Austria;

    ILF Consultanting Engineers, Austria;

    ILF Consultanting Engineers, Austria;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 隧道工程;隧道工程;隧道工程;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号