高层建筑管道井内烟气运动大涡模拟

采用火灾过程的场模拟理论,以大涡模拟为基础,分析了火灾烟气流动过程的动力学特征;为了验证大涡模拟数值方法的准确性,针对Mercier和Jaluria竖井内的实验工况进行了模拟研究,其模拟结果与试验结果吻合较好,表明大涡模拟可以较好地预测竖井内烟气流动情况;通过设定不同的火灾场景,对不同火源功率和不同几何尺寸条件下管道井内烟气的流动过程进行了数值模拟,其结果给出了不同的几何尺寸和火源功率对管道井内所形成“烟囱效应”的影响情况。笔者的模拟和研究表明:大涡模拟可较准确地预测高层建筑管道井内烟气的流动状态,对高层建筑的防火设计具有指导性作用。

Large Eddy Simulation of Smoke Movement in the High Rise Building Pipe Shaft

Based on large eddy simulation, field simulation theory was adopted to analyze dynarmic characteristics of the fire in pipe shaft of high rise building. At first Mercier and Jaluria working experiment in pipe shaft was simulated for verifying the accuracy of large eddy simulation. These two results of the experiment and field simulation were almost identical indicating that large eddy simulation could more accurately predict the smoke movement in pipe shaft. Then different fire sceneries were designed, and the smoke movement with different fire power and gecmetrical size of pipe shaft was mathematically simulated. The results showed the influence of different geometrical size of pipe shaft and fire power on chimney effect. It is found that large eddy simulation could more accurately predict the smoke movement in pipe shaft and guide the fire frying design of high rise building.