【作者】 周靖罡； 周晅毅； 王伟； 丛北华；

【Author】 ZHOU Jing-gang;ZHOU Xuan-yi;WANG Wei;CONG Bei-hua;State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University;

【机构】 同济大学土木工程防灾国家重点实验室；

【摘要】 采用计算流体动力学(Computational Fluid Dynamics, CFD)方法,对局部火灾场景中临近火盆的钢柱展开分析,并考虑水平来流的影响。为验证本文数值模拟方法的正确性,以火羽绕柱为案例首先进行了在无风情况下的火灾分析,通过与试验数据的比对验证了数值模型的正确性。在临近火盆的钢柱传热研究中,发现在来流影响下火焰发生明显的倾斜,当来流的速度大于临界值时火羽流从侧壁面环绕钢柱,形成火羽绕柱场景,从而导致流体场的热学特征以及钢柱壁面的受热情况发生显著变化。文章进行了气体温度场、速度场、钢柱壁面温度以及对流换热系数分布规律的探讨。更多还原

【Abstract】 The Computational Fluid Dynamics(CFD) method is used to analyze the localized fire condition where the brazer is adjacent to a steel column, and the consideration of horizontal flow is taken into account. In order to verify the correctness of the numerical simulation method in this paper, the column surrounding by fire was taken as an example to conduct a fire analysis under the condition of no wind at first, and the correctness of the numerical model was verified by comparison with the experimental data. In the thermal analysis of steel column near the brazer, it is found that the flame is obviously inclined under the influence of incoming flow.When the incoming flow velocity is greater than the critical value, the fire plume surrounds the steel column from the side surfaces, forming the scene of fire plume around the column, which leads to significant changes in the thermal characteristics of the fluid field and the heating condition of the steel column surfaces. The distribution rules of gas temperature field, velocity field, steel column wall temperature field and convective heat transfer coefficient are discussed in detail.更多还原