摘要
在燃烧风洞试验厅开展了无风和有风条件下的航空煤油池火燃烧实验，油池直径分别为0．15，0．20，0．30和0．60m，风速范围在0～3．5m／s．结果表明，不同直径油池均存在临界Ri^-1值，小于此临界值时，无量纲平均火焰高度随lnRi^-1的增加而线性减小，大于此临界值，无量纲火焰高度基本保持不变；随油池直径增加，临界Ri^-1值变大，稳定的无量纲平均火焰高度减少．理论推导了无风条件下火焰高度与油池直径、燃烧速率的函数关系，表明火焰高度Hf／D随Fc数的2／3次方变化，拟合给出了相关参数值，建立了无风条件下火焰高度的预测模型，并拟合建立了有风条件下池火焰高度的预测模型．
Aviation fuel pool fire experiments with and without cross wind were carried out in the Wind Tunnel of the State Key Laboratory of Fire Science. Image processing technology based on MATLAB program was built to analyze the flame height of aviation fuel with and without cross wind. In thes（ experiments, the diameters of circular pools are 0. 15, 0. 20, 0. 30 and 0. 60 m and the cross wind speed ranges from quiescence to 3.5 m/s. The dimensionless number Richardson number （Ri） was used to analyze the effect of cross wind on pool fires. The result shows that there is a critical value of Ri 1. When Ri 1 increases within the critical value, dimensionless flame height linearity decreases with in Ri 1. When Ri-1 exceeds this value, the flame configuration remains steady. The critical value of Ri-1 increases with pool diameter, however, the steady dimensionless flame height decreases with pool diameter. The relation between flame height without cross wind and pool diameter and burning rate was achieved by theoretical analysis, which shows that the dimensionless flame height Hf/D linearly changes with the Fc number to the power 2/3, and the values of some parameters were obtained by experiment data. Semi-empirical models were also developed to predict the flame height under windy conditions.
基金
火灾科学国家重点实验室团队项目
国家"十一五"科技支撑计划(2006BAK06B02)资助
