IDEAS home Printed from https://ideas.repec.org/a/gam/jeners/v13y2020i5p1206-d329053.html
   My bibliography  Save this article

Numerical Study of the Effects of the Jet Fan Speed, Heat Release Rate and Aspect Ratio on Smoke Movement in Tunnel Fires

Author

Listed:
  • Ha Thien Khieu

    (School of Mechanical Engineering, Chung-Ang University, 84, Heukseok-ro, Dongjak-gu, Seoul 06974, Korea)

  • Young Man Lee

    (School of Mechanical Engineering, Chung-Ang University, 84, Heukseok-ro, Dongjak-gu, Seoul 06974, Korea)

  • Ji Tae Kim

    (School of Mechanical Engineering, Chung-Ang University, 84, Heukseok-ro, Dongjak-gu, Seoul 06974, Korea)

  • Hong Sun Ryou

    (School of Mechanical Engineering, Chung-Ang University, 84, Heukseok-ro, Dongjak-gu, Seoul 06974, Korea)

Abstract

In this study, the effects of the jet fan speed, heat release rate and aspect ratio on smoke movement in tunnel fires have been investigated. The jet fan speed was changed from 6.25 (25%) to 12.5 m/s (50%), 18.75 m/s (75%), and 25 m/s (100%). The heat release rate was set up from 3.9 to 6 MW and 16 MW, the aspect ratio was changed from 0.6 to 1 and 1.5, respectively. The lower the jet fan speed is, the longer the smoke back-layering length is. With a higher velocity, the smoke tends to move out of the tunnel quickly; however, smoke stratification also occurs, and this reduces visibility. This could make it difficult for people to evacuate. With a higher heat release rate, the smoke tends to move far away from the fires quickly when compared with other cases. Additionally, the higher the heat release is, the longer the smoke back-layering is. Finally, with a higher aspect ratio, the smoke back layering length in the tunnel is also longer. The smoke layer thickness is also larger than in other cases. The correlation of velocity, heat release rate and aspect ratio has been investigated to avoid the smoke back layer length in tunnel fires.

Suggested Citation

  • Ha Thien Khieu & Young Man Lee & Ji Tae Kim & Hong Sun Ryou, 2020. "Numerical Study of the Effects of the Jet Fan Speed, Heat Release Rate and Aspect Ratio on Smoke Movement in Tunnel Fires," Energies, MDPI, vol. 13(5), pages 1-16, March.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:5:p:1206-:d:329053
    as

    Download full text from publisher

    File URL: https://www.mdpi.com/1996-1073/13/5/1206/pdf
    Download Restriction: no
    File URL: https://www.mdpi.com/1996-1073/13/5/1206/
    Download Restriction: no
    ---><---

    References listed on IDEAS

    as
    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. 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.
    Full references (including those not matched with items on IDEAS)

    Citations

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


    Cited by:

    1. Pengcheng Qin & Mingnian Wang & Zhanwen Chen & Guanfeng Yan & Tao Yan & Changling Han & Anmin Wang, 2021. "Effects of Ambient Pressure on Burning Characteristics of Gasoline: A Pilot Study," Energies, MDPI, vol. 14(15), pages 1-12, July.
    2. 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.

    Most related items

    These are the items that most often cite the same works as this one and are cited by the same works as this one.
    1. Mateusz Zimny & Piotr Antosiewicz & Grzegorz Krajewski & Tomasz Burdzy & Adam Krasuski & Wojciech Węgrzyński, 2019. "Several Problems with Froude-Number Based Scale Modeling of Fires in Small Compartments," Energies, MDPI, vol. 12(19), pages 1-20, September.
    2. Torgrim Log & Wegar Bjerkeli Pedersen, 2019. "A Common Risk Classification Concept for Safety Related Gas Leaks and Fugitive Emissions?," Energies, MDPI, vol. 12(21), pages 1-17, October.
    3. Kai Wang & Jingwei Hu & Ruiding Chen & Jianhua Wang, 2023. "A Study on the Evacuation of an Extra-Long Highway Tunnel Fire—A Case Study of Chengkai Tunnel," Sustainability, MDPI, vol. 15(6), pages 1-17, March.
    4. Javier Menéndez & Noe Merlé & Jesús Manuel Fernández-Oro & Mónica Galdo & Laura Álvarez de Prado & Jorge Loredo & Antonio Bernardo-Sánchez, 2022. "Concentration, Propagation and Dilution of Toxic Gases in Underground Excavations under Different Ventilation Modes," IJERPH, MDPI, vol. 19(12), pages 1-21, June.
    5. Xiaoqin Hu & Arjen Kraaijeveld & Torgrim Log, 2020. "Numerical Investigation of the Required Quantity of Inert Gas Agents in Fire Suppression Systems," Energies, MDPI, vol. 13(10), pages 1-15, May.
    6. Pengcheng Qin & Mingnian Wang & Zhanwen Chen & Guanfeng Yan & Tao Yan & Changling Han & Anmin Wang, 2021. "Effects of Ambient Pressure on Burning Characteristics of Gasoline: A Pilot Study," Energies, MDPI, vol. 14(15), pages 1-12, July.
    7. Artur J. Jaworski, 2019. "Special Issue “Fluid Flow and Heat Transfer”," Energies, MDPI, vol. 12(16), pages 1-4, August.
    8. Jaroslav Vrchota & Martin Pech & Ladislav Rolínek & Jiří Bednář, 2020. "Sustainability Outcomes of Green Processes in Relation to Industry 4.0 in Manufacturing: Systematic Review," Sustainability, MDPI, vol. 12(15), pages 1-47, July.

    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:13:y:2020:i:5:p:1206-:d:329053. 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.

    If CitEc recognized a bibliographic reference but did not link an item in RePEc to it, you can help with 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.