Study on the Shaft Height of Natural Ventilation Using Smoking Shaft in Urban Tunnel
The characteristics of smoke flow in natural ventilation shaft are studied in this paper, Using the computational fluid dynamics software FDS5.0 to build a 3D model of an urban tunnel with a smoking shaft, Large Eddy Simulation model was used to obtain the structure of flow field and the mass flow rate of natural ventilation at different shaft height, The results show that when the shaft height is low, the driving force of exhaust is weak and the exhaust capacity reduces rapidly, the flow state in shaft is controlled by horizontal inertia force; when the shaft height increase to a critical height, the exhaust effect enhance significantly, the flow state in shaft will change to stack effect control.
W. Zhong et al., "Study on the Shaft Height of Natural Ventilation Using Smoking Shaft in Urban Tunnel", Applied Mechanics and Materials, Vols. 90-93, pp. 2297-2300, 2011