焰流效应下混凝土空心薄壁墩火温时变分布
发布时间：2018-08-09 06:45
【摘要】：针对火灾场气流与焰域温度空间耦合变化时的结构响应,通过考虑气流流速及焰围空间和结构物高度的相互作用效应,建立了焰流场环境火灾模型。采用时间增量迭代的方法计算了焰流场温度,研究了复合边界控制方程和对流换热与流速之间的相互关系。分析了流场中结构迎流面和侧流面温度分布状态,研究了混凝土空心薄壁墩的环境火灾场景,建立了焰流场结构耦合模型,揭示了焰流效应下混凝土空心薄壁墩三维空间火温时变分布规律。研究结果表明:火延时间为120min,流速为3m·s-1时,近火点温度比其他流速下温度约高100℃,流速对火源温度呈非线性影响状态;500℃以上的高温层在混凝土空心薄壁墩迎火面分布深度仅为7cm,在竖向荷载作用下空心薄壁墩外层迎火面混凝土易产生层剥现象;迎流面温度远高于侧流面温度,背火面温度无变化;稳态低流速场中流速的变化可改变不同温度区域的分布,并扩大迎火面高温区面积。
[Abstract]:In view of the structural response of the air flow in the fire field and the temperature coupling in the flame region, the fire model of the flame flow field is established by considering the interaction effect of the flow velocity, the flame circumference space and the height of the structure. The temperature of flame flow field is calculated by time increment iteration method. The composite boundary control equation and the relationship between convection heat transfer and velocity are studied. In this paper, the temperature distribution of the front and side flow surfaces in the flow field is analyzed, the environment fire scene of the concrete hollow thin-walled pier is studied, and the structure coupling model of the flame flow field is established. The time-varying distribution of fire temperature in three-dimensional space of hollow thin-walled concrete pier under flame effect is revealed. The results show that the temperature near the fire point is about 100 鈩，
本文编号：2173221
[Abstract]:In view of the structural response of the air flow in the fire field and the temperature coupling in the flame region, the fire model of the flame flow field is established by considering the interaction effect of the flow velocity, the flame circumference space and the height of the structure. The temperature of flame flow field is calculated by time increment iteration method. The composite boundary control equation and the relationship between convection heat transfer and velocity are studied. In this paper, the temperature distribution of the front and side flow surfaces in the flow field is analyzed, the environment fire scene of the concrete hollow thin-walled pier is studied, and the structure coupling model of the flame flow field is established. The time-varying distribution of fire temperature in three-dimensional space of hollow thin-walled concrete pier under flame effect is revealed. The results show that the temperature near the fire point is about 100 鈩，
本文编号：2173221
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