本文针对竖井型城市公路隧道,对隧道内外环境风速进行实测,考虑不同环境风速、竖井高度与数量,设计24个工况,采用动网格技术与动量源项法,开展行车工况下隧道通风流场数值模拟,模拟获得车辆逼近-到达-远离竖井时隧道流场分布.结果表明:此类隧道内外均存在较为稳定的1 m/s左右纵向环境风;车辆顶部及后方出现明显回流现象,最大回流风速约2 m/s,出现在5～5.5 m高度;竖井截面风速不均匀系数以及转换系数随车辆运动先增大后减小;竖井通风效率与竖井数量、反向风速呈正相关,最大值达到100％,但随竖井高度、正向风速的增大而降低,街谷风影响较小.
This study focused on urban road tunnels with shafts,measuring the interior and exterior ambient wind speeds.Considering variation in ambient wind speeds,shaft heights,and the number of shafts,a total of 24 cases were designed.Dynamic mesh and momentum source term techniques were employed to conduct numerical simulations of the tunnel's ventilation flow fields under driving conditions,obtaining its distribution when vehicles approached,passed by,and moved away from the shafts.The results indicated a stable longitudinal ambient wind of approximately 1 m/s both inside and outside the tunnels.Backflow phenomena were observed at the top and rear of vehicles,with a maximum backflow wind speed of about 2 m/s occurring at a height of 5-5.5 m.The uneven coefficient of velocity in a shaft cross-section and the conversion factor initially increased and then decreased with vehicle movement.The shaft ventilation efficiency was positively correlated with the number of shafts and reverse wind speed,reaching a maximum value of 100％.However,it decreased with increasing shaft height and forward wind speed,with a weak influence from street valley winds.
黄伟浩;童展鹏;熊道龙;周银清;童艳;柳泽林;陈锴铨
南京工业大学城市建设学院,江苏 南京 211800
交通运输
隧道;竖井;活塞风;动网格;回流高度;通风效率
tunnel;shaft;piston wind;dynamic mesh;backflow height;ventilation efficiency
《南京工业大学学报（自然科学版）》 2024 (003)
321-329,354 / 10
国家自然科学基金面上项目(52278112);江苏省研究生实践创新计划(SJCX22_0471)
10.3969/j.issn.1671-7627.2024.03.009
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