中文摘要：

为了研究障碍物诱导湍流火焰特性,基于150 mm×150 mm×500 mm的小尺度爆炸腔体,在三个障碍物交错放置的条件下,采用预混燃烧模型对瓦斯爆炸过程进行大涡模拟。基于模拟结果,分析了瓦斯爆炸过程中火焰结构、未燃气体流动迹线以及火焰与未燃气体漩涡耦合规律。结果发现：小尺度条件下,障碍物诱导火焰形变,增大火焰面积,提高燃烧速率;在障碍物扰动作用下,未燃预混气体在障碍物形成漩涡,且漩涡尺寸及强度逐渐增大;未燃预混气体漩涡将爆炸火焰卷入其中,形成湍流火焰。

英文摘要：

In order to study the characteristic of turbulent flame in gas explosion,the large-eddy simulation is used to simulate the explosion process with a premixed combustion model based on a small-scale explosion chamber with the size of 150 mm × 150 mm × 500 mm and three cross obstacles. According to the simulation results,the flame structure,the flowing trace of the unburned gas,and their coupled laws are analyzed. The results show that： under the conditions of small-scale,the deformation of the flame induced by obstacles increases the flame area and improves the combustion rate; eddies of unburned gas appear behind the obstacles and the eddies size increase gradually; the flame will be involved into the unburned gas eddies,forming turbulent flame.