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

Author

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  • 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
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    References listed on IDEAS

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    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.
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    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.

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