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Calculation and design of tunnel ventilation systems using a two-scale modelling approach

机译：隧道通风系统的两尺度建模计算与设计

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摘要

This paper develops a novel modelling approach for ventilation flow in tunnels at ambient conditions (i.e. cold flow). The complexity of full CFD models of flow in tunnels or the inaccuracies of simplistic assumptions are avoided by efficiently combining a simple, mono-dimensional approach to model tunnel regions where the flow is fully developed, with detailed CFD solutions where flow conditions require 3D resolution. This multi-scale method has not previously been applied to tunnel flows. The low computational cost of this method is of great value when hundreds of possible ventilation scenarios need to be studied. The multi-scale approach is able to provide detailed local flow conditions, where required, with a significant reduction in the overall computational time. The coupling procedures and the numerical error induced by this new approach are studied and discussed. The paper describes a comparison between numerical results and experimental data recorded within a real tunnel underlining how the developed methodology can be used as a valid design tool for any tunnel ventilation system. This work sets the foundations for the coupling of fire-induced flows and ventilation systems where further complexities are introduced by the hot gas plume and smoke stratification.
机译：本文针对环境条件下的隧道通风流量（即冷流量）开发了一种新颖的建模方法。通过将简单的一维方法有效地结合到充分开发流量的隧道区域的模型中，并结合详细的CFD解决方案（其中流量条件需要3D分辨率），可以避免隧道中流量的完整CFD模型的复杂性或简单假设的不精确性。这种多尺度方法以前尚未应用于隧道流。当需要研究数百种可能的通风场景时，此方法的低计算成本具有巨大的价值。多尺度方法能够在需要时提供详细的局部流动条件，从而大大减少了总体计算时间。研究和讨论了这种新方法引起的耦合过程和数值误差。本文介绍了在实际隧道中记录的数值结果和实验数据之间的比较，强调了如何将开发的方法用作任何隧道通风系统的有效设计工具。这项工作为引燃气流和通风系统的耦合奠定了基础，在这些系统中，热气柱和烟气分层进一步增加了复杂性。

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  • 来源
    《Building and Environment》 |2009年第12期|2357-2367|共11页
  • 作者

    F. Colella; G. Rein; R. Borchiellini; R. Carvel; J.L. Torero; V. Verda;

  • 作者单位

    Politecnico di Torino, Dipartimento di Energetica, Italy;

    University of Edinburgh, BRE Centre for Fire Safety Engineering, UK;

    Politecnico di Torino, Dipartimento di Energetica, Italy;

    University of Edinburgh, BRE Centre for Fire Safety Engineering, UK;

    University of Edinburgh, BRE Centre for Fire Safety Engineering, UK;

    Politecnico di Torino, Dipartimento di Energetica, Italy;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    tunnel; ventilation systems; two-scale; jet fans;

    机译：隧道;通风系统;两尺度喷气风扇;

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