Abstract
This paper proposes numerical investigations carried out on a small scale tunnel model airing to study the fire-induced smoke control by longitudinal and longitudinal-natural ventilation systems. We studied the effect of two ventilation systems on the temperature distribution and stratification of the pollutant to estimate the efficiency of ventilation systems. The flow is characterized by the temperature fields, temperature profiles and the Froude number. The numerical tool used is FDS (version 4.0). This numerical study requires validation with an experience of literature. Good agreement with experimental results confirms the possibility of using this code in the problem.
Highlights
We studied the effect of two ventilation systems on the temperature distribution and stratification of the pollutant to estimate the efficiency of ventilation systems
A tunnel fire has very complex flow structure because it is a physical phenomenon that is affected by tunnel geometry, inclination, ventilation system capacity, and wind pressure, including chemical reaction, etc
This paper presents numerical investigations carried out on a small scale tunnel model to study the fire-induced smoke control by longitudinal and longitudinal-natural ventilation systems, for certain types of tunnels, based on the criterion of flow stratification and temperature distribution
Summary
A tunnel fire has very complex flow structure because it is a physical phenomenon that is affected by tunnel geometry, inclination, ventilation system capacity, and wind pressure, including chemical reaction, etc. Numerical simulation analyzed the effect of the aspect ratio on smoke movement in tunnel fires and temperature distribution under the tunnel ceiling will be studied by Sung Ryong. The longitudinal temperature distribution under the tunnel ceiling at different longitudinal ventilation velocities have been studied experimentally and numerically. Experimental study of the smoke temperature distribution along the tunnel ceiling under the effect of the longitudinal velocity of ventilation was studied bay Hu and al [10]. Hwang et al [13] studied the critical ventilation velocity and described the stratification and the temperature distribution in tunnel fires. This paper presents numerical investigations carried out on a small scale tunnel model to study the fire-induced smoke control by longitudinal and longitudinal-natural ventilation systems, for certain types of tunnels, based on the criterion of flow stratification and temperature distribution
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