中文摘要：

为了分析无约束可燃气云爆炸产生的高温伤害效应，建立了相应的数学模型，利用有限体积的离散方法，对无约束空间内甲烷浓度10％、高径比为1的圆柱形可燃气云爆炸的瞬态温度场进行了数值研究。研究结果表明，圆柱形可燃气云爆炸的温度场呈不对称性分布，靠近地面处足最危险区域，高温可能达到的最大怪直高度和最大水平距离分别约为圆柱体高的2倍和半径的3．2倍。对数值模拟结果的数据进行多项式拟合，得到了圆柱形可燃气云爆炸场最高温度随水平距离、初温及参与爆炸气云质量的函数关系式，给可燃气云爆炸灾害的预测及防护提供了科学依据。

英文摘要：

In order to analyze the high-temperature injury effects generated by unconfined flammable vapor cloud ex- plosion, the corresponding mathematical model was established, and the transient temperature field of a cylindrical flammable vapor cloud explosion with methane concentration of 10% and height-to-diameter ratio of 1 was numeri- cally simulated by finite-volume discrete method in unconfined space. The study indicated that the temperature field of the cylindrical flammable vapor cloud explosion presented an asymmetrical distribution; the most hazardous area was nearby ground; the maximum vertical altitude and horizontal distance of possible high-temperature region were about 2 times height and 3.2 times radius of the cylinder, respectively. Furthermore, the function relationship of the maximum temperature with the horizontal distance, initial temperature and mass of vapor cloud was obtained by polynomial fit of computed data. The study results can provide scientific basis for forecast and protection of flammable vapor cloud explosion.