考虑来流的局部火灾场景钢柱传热模拟研究  

STEEL COLUMN THERMAL ANALYSIS UNDER LOCALIZED FIRE CONDITION CONSIDERING FLOW INFLUENCE

作　　者：周靖罡 王伟[1] 周晅毅[1] 丛北华[2] ZHOU Jing-gang;WANG Wei;ZHOU Xuan-yi;CONG Bei-hua(State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China;Shanghai Institute of Disaster Prevention and Relief,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092 [2]同济大学上海防灾救灾研究所,上海200092

出　　处：《工程力学》2023年第S01期219-226,共8页Engineering Mechanics

基　　金：国家自然科学基金项目(52078380);土木工程Ⅰ类高峰学科建设经费项目(2022-3-YB-18)

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。为验证该文数值模拟方法的正确性,以顶棚射流模型为案例,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。该文进行了气体温度场、速度场、钢柱壁面温度以及对流换热系数分布规律的探讨。The computational fluid dynamics(CFD)method is used to analyze the localized fire condition where the brazier 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,the ceiling jet model was thusly 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 brazier,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,of velocity field,of steel column wall temperature field and,of convective heat transfer coefficient are discussed in detail.

关 键 词：计算流体动力学 局部火灾 钢柱 来流 对流换热系数 

分 类 号：X932[环境科学与工程—安全科学] TU391[建筑科学—结构工程]