To study the evaporation of methanol liquid and the diffusion laws of methanol vapor in tunnel , the CFD method was applied to analyze the distribution laws of methanol vapor concentration in the tunnel .The results showed that the accu-mulation of methanol vapor could be found at the bottom and both sides of the vehicle as well as over the shallow liquid pool , and the concentration stratification of vapor had a certain regularity with the obvious concentration stratification on the longitu -dinal section .The methanol vapor mainly distributed in the middle and lower parts of the tunnel , especially in the space be-low the height of 1 m from the ground surface .The area where the methanol vapor concentration is close to or exceeds the ex -plosion limit might appear over the leakage source , at the bottom and both sides of the vehicle .The phenomenon of vapor ac-cumulation appeared at the bottom and lower positions of both sides of the vehicle in the tunnel , and the vehicle hindered the diffusion of methanol vapor to the tunnel entrance at the opposite side .%为了研究隧道内甲醇液体蒸发及蒸气扩散规律,应用CFD方法进行了研究,分析了隧道内甲醇蒸气浓度分布规律.结果表明:浅液池上方、车辆底部及两侧位置出现甲醇蒸气的积聚,蒸气浓度分层具有一定的规律性,纵截面浓度分层较明显;甲醇蒸气主要分布于隧道中下部位置,尤其在距离地面1m以下的空间,在泄漏源上方、车辆底部、车辆两侧均可能出现蒸气接近或超过爆炸极限的区域;隧道内障碍车辆底部和两侧较低位置蒸气产生积聚,同时车辆也阻碍了蒸气向对侧隧道口的扩散.
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