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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

School of Mechanical Engineering, Chung-Ang University,82, Heukseok-ro, Dongjak-gu, Seoul 06974, Korea
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Energies 2019, 12(1), 133; https://doi.org/10.3390/en12010133
Received: 30 November 2018 / Revised: 26 December 2018 / Accepted: 26 December 2018 / Published: 1 January 2019
(This article belongs to the Special Issue Engineering Fluid Dynamics 2018)
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. View Full-Text
Keywords: aspect ratio; evacuation; fire propagation; tunnel vehicle fire; unsteady heat release rate aspect ratio; evacuation; fire propagation; tunnel vehicle fire; unsteady heat release rate
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MDPI and ACS Style

Park, Y.; Lee, Y.; Na, J.; Ryou, H.S. 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 2019, 12, 133. https://doi.org/10.3390/en12010133

AMA Style

Park Y, Lee Y, Na J, Ryou HS. 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. 2019; 12(1):133. https://doi.org/10.3390/en12010133

Chicago/Turabian Style

Park, Younggi, Youngman Lee, Junyoung Na, and Hong S. 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 12, no. 1: 133. https://doi.org/10.3390/en12010133

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