可燃液体自由表面燃烧特性的数值模拟

依据小尺度汽油燃烧实验模拟法确定边界条件,采用数值模拟方法进行汽油池火燃烧模拟。数值模拟结果和实验结果具有一致性:用非稳态数值模拟的火焰热辐射随燃烧的进行逐步增加;热辐射分布以火焰的高温区分布较强;火焰中各组分如氧气消耗量、C(s)等质量浓度与燃烧时间的无量纲关系曲线与燃烧过程的温度分布一致,且遵循双曲线变化规律。采用稳态模拟方法得到不同风速条件下火焰倾角与风速之间的变化曲线,有风时火焰温度较无风时增加,且随着风速的增加而增加(实际上存在某个临界风速);有风时火焰热辐射分布随火焰的倾斜而改变,下风向热辐射明显,上风向则较低,且热辐射波及范围较无风时增大。

The numerical simulation for combustion characteristics on free surface of flammable liquid

Based on experimental simulation method to determine the boundary conditions,and used the numerical simulation methods to calculate the combustion of gasoline pool fire.The results of numerical simulation and experimental simulation are consistent:The thermal radiation of flame is gradual increasing with the flame burning by the numerical simulation method of non-steady-state;thermal radiation distribution is stronger in the high-temperature region of flame;the dimensionless distribution curves these components such as oxygen consumption,C(s) and other concentrations of mass fraction in the flame with the burning time were consistent with the temperature distribution of the burning,and followed the hyperbolic variation.The curve between the flame angle and wind speed under different wind speed was obtained by the steady-state simulation,and the flame temperature increases when there is wind than no,and with the wind speed increases(in fact there exists a critical velocity);the distribution of thermal radiation changes with the flame tilt when there is wind,and it changes significantly in the downwind direction while small upwind,and spread wider than no wind.