喷射火条件下储罐水冷却效能的数值模拟

Numerical simulation of water spray cooling performance on the tank under jet fire

为研究喷射火条件下的储罐水冷却效能,基于FLUENT软件建立喷射火—水喷淋储罐模型进行数值模拟,分析在不同水流流量条件下,水膜在储罐表面的分布规律,探讨了喷射火条件下储罐壁面水膜的破断性,说明热毛细力和表面张力是水膜稳定性的关键因素,给出了水膜破断行为的三个阶段,得出21.5kg/s是最小润湿速率,针对水流流动方向上壁面温度分布,结合试验数据和数值模拟结果,得出Re=460为换热系数转折点,给出了喷射火条件下水膜的换热系数公式。

To study the effectiveness of spray water cooling tank under fire conditions,the establishment of FLUENT software based spray fire-water spray tank model to simulate the flow is analyzed under different flow conditions,the distribution of the water film on the surface of the tank explore the conditions under tank fire wall jet breaking the water film,indicating that thermal capillary forces and surface tension of water film stability is a key factor,gave the behavior of the water film breaking in three phases,obtained 21.5kg/s is the minimum wetting rate for water flow direction on the wall temperature distribution,combined with experimental data and simulation results,obtained for Re=460heat transfer coefficient turning point,gave the conditions under fire spray water film heat transfer coefficient formula.