阻滞下的竖井型隧道自然通风试验与数值模拟

发布时间：2018-06-23 13:44

本文选题：隧道 + 自然通风　；参考：《地下空间与工程学报》2015年01期

【摘要】：针对竖井型城市公路隧道自然通风的当前研究现状,分析阻滞工况下的流场特征与存在的问题。依据相似准则,搭建局部暗埋段小尺寸模型,设置车辆发热源,测试纯热压作用下的流动速度。采用三维非稳态流动模型,利用FLUENT软件,模拟热压作用下的温度场、速度场,采用试验验证了模拟的准确性。进一步的车速、竖井个数与暗埋段长度的敏感性分析表明:车辆阻滞时,交通风力对隧道内自然通风影响小,热压成为影响隧道流场的主导因素;同一暗埋段内流场不均匀分布,中部远离两端竖井,改变竖井个数对此处流场影响较弱;暗埋段各典型位置风速随暗埋段长度增加而增加。
[Abstract]:In view of the current research situation of natural ventilation in shaft type urban highway tunnel, the characteristics of flow field and the existing problems are analyzed. According to the similarity criterion, the small size model of local buried section is built, the heat source of vehicle is set up, and the flow velocity under pure hot pressing is measured. The 3-D unsteady flow model was used to simulate the temperature field and velocity field under hot pressing with fluent software. The accuracy of the simulation was verified by experiments. The sensitivity analysis of speed, shaft number and the length of hidden section shows that the wind force has little effect on natural ventilation in tunnel, and hot pressure is the main factor to influence the flow field of tunnel. The distribution of the flow field in the same buried section is uneven and the central shaft is far away from the two ends of the shaft. Changing the number of the shaft has a weak effect on the flow field, and the wind speed of each typical location of the buried section increases with the increase of the length of the buried section.
【作者单位】：南京工业大学城市建设与安全工程学院;
【基金】：国家自然科学基金面上项目(51178217) 江苏省自然科学基金面上项目(BK2011804)
【分类号】：U453.5

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