Optimization of the Underground Bidirectional BRT Ventilation Systems

Abstract

The urban traffic is a common concern in the large cities around the world, and th calls for high technology to improve its efficiency and reduce its costs. The underground traffic development is one solution used often in the metropolitan cities like Paris and London. In China, the ventilation system of the underground bidirectional BRT still needs more refinement to achieve the sustainable development, though the underground traffic system has developed very fast. The airfoil structure is adopted abroad to dilute the polluted air in the subway stations and increase the ventilation efficiency, yet it has not been applied in China. This paper studies the reduction of the piston wind loss by airfoil structure on the basis of piston principle, so as to improve the role of the piston wind in the ventilation process. In the mathematical simulation, it is also proved that this method can substantially increase wind energy by 63.27% per meter of the underground road, improving the ventilation efficiency of the underground BRT. Due to the failure to refine the parameter curve of the airfoil structure, the simulation data has some deviations. In future studies, in order to make up for the shortcomings of this study, it is necessary to use XFLR software to carry out refined parameter analysis of laminar airfoil.