基于MIDAS NFX曲线隧道烟气分布特性数值研究  

NUMERICAL STUDY OF FLUE GAS DISTRIBUTION CHARACTERISTICS IN MIDAS NFX CURVE TUNNEL

作　　者：唐晓成 付鹏帅 刘华宇 TANG Xiaocheng;FU Pengshuai;LIU Huayu(Jilin Jianzhu University,Changchun 130000,China)

机构地区：[1]吉林建筑大学,长春130000

出　　处：《低温建筑技术》2024年第4期54-58,共5页Low Temperature Architecture Technology

基　　金：吉林省自然科学基金项目“不同多孔结构胫骨部分假体柄对假体周围骨密度影响的模拟研究及其力学性能的试验研究”(YDZJ202201ZYTS407)。

摘　　要：为探究不同曲率的隧道在发生火灾时对其温度分布、临界风速及烟气分布的影响,基于CFD(计算流体动力学)数值计算方法,考虑不同曲率对临界风速、温度分布、烟气分布的影响,将得到的数据进行分析拟合。文中以大连至旅顺中部通道工程某隧道为工程背景,进行烟气分布特性数值研究。通过研究表明,在通风风速和热释放率相同的条件下隧道内烟气回流长度随着曲率的增大逐渐减小,临界风速也出现相似的结论,而曲率对隧道内温度的分布情况影响较小,在通风条件下曲线型隧道火源区产生横向湍流,隧道外侧壁面烟气流动较内侧烟气流动更快。研究可为今后处理曲线型隧道火灾事故方面提供一些参考。This paper studies the influence of tunnel with different curvature on its temperature distribution.Taking a tunnel project as the research object,the numerical study of flue gas distribution characteristics is carried out by using computational fluid dynamics(CFD) numerical calculation method,in which the influence of different curvature on critical wind speed,temperature distribution,and flue gas distribution is analyzed.The results show that the flue gas reflux length in the tunnel decreases gradually with the increase of the curvature under the condition of the same ventilation wind speed and heat release rate.The critical wind speed also shows a similar trend,while the curvature has little effect on the temperature distribution in the tunnel.Under the ventilation condition,transverse turbulence occurs in the fire source area of the curved tunnel,and the flue gas flows faster on the outside of the tunnel than on the inside.The research may provide the reference for dealing with fire accidents in curved tunnel in the future.

关 键 词：曲线型隧道 临界风速 回流距离 烟气蔓延 

分 类 号：TU753[建筑科学—建筑技术科学]