NUMERICAL STUDY OF FLUE GAS DISTRIBUTION CHARACTERISTICS IN MIDAS NFX CURVE TUNNEL
This paper studies the influence of tunnel with different curvature on its temperature distribution. Taking a tunnel project as the research object,the numerical study of flue gas distribution characteristics is carried out by us-ing computational fluid dynamics (CFD) numerical calculation method,in which the influence of different curvature on critical wind speed,temperature distribution,and flue gas distribution is analyzed. The results show that the flue gas reflux length in the tunnel decreases gradually with the increase of the curvature under the condition of the same ventilation wind speed and heat release rate. The critical wind speed also shows a similar trend,while the curvature has little effect on the temperature distribution in the tunnel. Under the ventilation condition,transverse turbulence occurs in the fire source area of the curved tunnel,and the flue gas flows faster on the outside of the tunnel than on the inside. The research may provide the reference for dealing with fire accidents in curved tunnel in the future.
万方数据
维普
