IDEAS home Printed from https://ideas.repec.org/a/gam/jeners/v12y2019i1p133-d194199.html
   My bibliography  Save this article

Numerical Study on the Effect of Tunnel Aspect Ratio on Evacuation with Unsteady Heat Release Rate Due to Fire in the Case of Two Vehicles

Author

Listed:
  • Younggi Park

    (School of Mechanical Engineering, Chung-Ang University,82, Heukseok-ro, Dongjak-gu, Seoul 06974, Korea)

  • Youngman Lee

    (School of Mechanical Engineering, Chung-Ang University,82, Heukseok-ro, Dongjak-gu, Seoul 06974, Korea)

  • Junyoung Na

    (School of Mechanical Engineering, Chung-Ang University,82, Heukseok-ro, Dongjak-gu, Seoul 06974, Korea)

  • Hong Sun Ryou

    (School of Mechanical Engineering, Chung-Ang University,82, Heukseok-ro, Dongjak-gu, Seoul 06974, Korea)

Abstract

In this study, the characteristics of fires in case of two vehicles in a tunnel are analyzed by Computational Fluid Dynamics analysis for varying tunnel aspect ratios. Unsteady heat release rates over time are set as the input conditions of fire sources considering real phenomena. Unsteady heat release rate values are obtained from experiments. As a result, the smoke velocities above the fire source appear faster in the case of tunnels with a large aspect ratio because the higher the height of the tunnel, the faster the smoke velocity caused by buoyancy forces. The smoke velocity in the longitudinal direction increases quickly. However, the temperature distribution in the vicinity of the ceiling is low when the tunnel aspect ratio is large because the height of the tunnel is not directly affected by the flames. Also, the higher the height of the tunnel, the lower the visibility distance due to the heat and smoke coming down along the wall surface. However, in the tunnels represented in this study, it is considered that the visibility of evacuees is sufficiently secured.

Suggested Citation

  • Younggi Park & Youngman Lee & Junyoung Na & Hong Sun Ryou, 2019. "Numerical Study on the Effect of Tunnel Aspect Ratio on Evacuation with Unsteady Heat Release Rate Due to Fire in the Case of Two Vehicles," Energies, MDPI, vol. 12(1), pages 1-12, January.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:1:p:133-:d:194199
    as

    Download full text from publisher

    File URL: https://www.mdpi.com/1996-1073/12/1/133/pdf
    Download Restriction: no
    File URL: https://www.mdpi.com/1996-1073/12/1/133/
    Download Restriction: no
    ---><---

    Citations

    Citations are extracted by the CitEc Project, subscribe to its RSS feed for this item.
    as


    Cited by:

    1. Younggi Park & Jaiyoung Ryu & Hong Sun Ryou, 2019. "Experimental Study on the Fire-Spreading Characteristics and Heat Release Rates of Burning Vehicles Using a Large-Scale Calorimeter," Energies, MDPI, vol. 12(8), pages 1-16, April.
    2. Xia Zhong Zheng & Dan Tian & Ming Zhang & Chaoran Hu & Liyang Tong, 2019. "A Stairs Evacuation Model Considering the Pedestrian Merging Flows," Discrete Dynamics in Nature and Society, Hindawi, vol. 2019, pages 1-11, December.
    3. Haitao Wang & Huanhuan Gao, 2022. "Study of Blockage Effects of Metro Train on Critical Velocity in Sloping Subway Tunnel Fires with Longitudinal Ventilation," Energies, MDPI, vol. 15(15), pages 1-14, August.
    4. Aleksander Król & Małgorzata Król, 2021. "Some Tips on Numerical Modeling of Airflow and Fires in Road Tunnels," Energies, MDPI, vol. 14(9), pages 1-15, April.
    5. Sanjay Kumar Khattri & Torgrim Log & Arjen Kraaijeveld, 2019. "Tunnel Fire Dynamics as a Function of Longitudinal Ventilation Air Oxygen Content," Sustainability, MDPI, vol. 11(1), pages 1-13, January.

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:gam:jeners:v:12:y:2019:i:1:p:133-:d:194199. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    We have no bibliographic references for this item. You can help adding them by using this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: MDPI Indexing Manager (email available below). General contact details of provider: https://www.mdpi.com .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.