Influence of a Baffle and Shaft Spacing on Shaft Exhaust Efficiency

Abstract In road tunnel. A baffle-coupled shaft is used to decrease the plug-holing and boundary layer separation. Install baffle on both sides of the shaft (when the fire occurs upstream of the shaft, the baffle upstream of the shaft closes and the baffle downstream of the shaft opens), it can function as a smoke barrier. In order to study the distance between the baffle and shaft, numerical simulation was performed using the Fire Dynamic Simulation (Version 6.7.1). We use the mass flow of carbon monoxide discharged through the shaft as a basis for evaluating the efficiency of exhausting smoke. As the spacing increases, the exhaust efficiency increases first and then decreases. In this paper, the baffle-coupled is set 2 meters.