Abstract
Abstract The corresponding physical model was established by using a tunnel, and the appropriate fire source power was selected. The minimum export momentum was calculated by the minimum export momentum method, and the minimum outlet jet velocity of the air curtain is given as umin = 14m/s. The change of the concentration of CO, visibility and temperature in the same fire environment under the influence of piston wind was analyzed by CFD simulation software under different jet velocity of air curtain, comparison of the concentration of CO, visibility and temperature at different jet speed of air curtain changes with time simultaneously, to study the effect of jet velocity of air curtain on the spread characteristics of flue gas of tunnel fire. The results show that when the jet velocity of air curtain is 14m/s, it can control the smoke best.
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