Abstract:

This study investigated the flame morphology of dike-divided pool fires under varying wind speeds and systematically analyzed the thermal radiation intensity distribution and failure time of adjacent tanks through Pyrosim-based fire modeling and Abaqus thermal-stress coupling analyses, while validating the high accuracy and feasibility of the coordinate mapping method in thermo-mechanical coupling simulations. Numerical simulations revealed that the flame behavior transitioned from vertical ascent to lateral inclination toward adjacent tanks with increasing wind speed. Under wind speeds of 0 and 3m/s, the flame maintained slight overall tilt, and the thermal radiation intensity distribution focused predominantly on the middle-lower sections of storage tanks. At wind speed of 6m/s, the upper flame portion became stretched and tilted, resulting in gradually intensified thermal radiation exposure on the middle-upper tank regions. When wind speed reached 9m/s, significant flame inclination and wall proximity occurred, concentrating thermal radiation intensity in the middle-upper tank sections, where maximum radiation intensity reached 3.5 times that observed under 6m/s conditions. Thermo-mechanical coupling analysis demonstrated that the high-temperature zone shifted from middle-lower to middle-upper tank regions with increasing wind speed, establishing the middle-upper sections as the primary risk area for tank failure.

Key words: dike-divided pool fire, fixed top tank, thermal response, thermal burning characteristics

摘要：

基于Pyrosim火灾模拟和Abaqus热力耦合分析，验证了坐标映射法在热-力耦合模拟中的高精度与可行性，探究了不同风速条件下隔堤池火的火焰形状，并系统地分析了邻罐热辐射强度分布和失效时间。通过数值模拟发现，池火的火焰行为随着风速的增加从垂直上升逐渐向邻罐倾斜扩展，在风速为0和3m/s条件下，火焰整体倾斜较小，热辐射强度分布集中于储罐中下部；在风速为6m/s条件下，火焰上部被拉长倾斜，储罐中上部受到的热辐射强度逐渐增加；在风速为9m/s条件下，火焰明显倾斜并贴近罐壁，热辐射强度分布集中于储罐中上部，最大热辐射强度为6m/s风速条件下的3.5倍。通过对不同风速下储罐进行热-力耦合分析，发现储罐温度分布随着风速的增加由中下部向中上部转移，储罐中上部成为失效的主要风险区域。

关键词: 隔堤池火, 固定顶罐, 热响应, 热烧特性