A small-scale model with proportion of 1 to 10 is harnessed to study the exhaust of urban traffic link tunnel in different ventilative conditions. The analysis of temperature and smoke behaviors captured at different velocity of exhaust utilizing mechanical ventilator and natural ventilation is as below. In the test without natural ventilation, the smoke layers will descend more slowly if exhaust rate is faster at the roof of tunnel and the temperature of smoke beneath the roof is lower, which confirms a better environment for evacuation; In the test with appropriate natural ventilation, the mechanical ventilator brings less help.%进行1/10小尺寸模型试验,研究城市地下交通环廊不同通风排烟方式下的排烟效果.通过对机械排烟和自然排烟方式下,不同风速时环廊内温度和烟气变化情况试验结果的分析表明:在无自然排烟时,地下交通环廊顶部的排烟量越大,烟气层下降的越慢,顶部以下的烟气温度越低,越有利于人员疏散；在有合适的自然排烟时,地下交通环廊的自然排烟口具有很好的排烟作用,机械排烟对烟气影响不大.
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