相连容器中粉尘爆炸的火焰传播

采用实验和数值模拟相结合的方法对相连容器中玉米淀粉粉尘爆炸的火焰传播行为进行了研究.实验装置为通过长管相连接的两个容器,爆炸在一个容器中引发后通过管道传播到另一个容器中.采用欧拉-拉格朗日方法模拟粉尘爆炸的两相流问题,气相湍流模型采用k-ε模型,粒子燃烧模型考虑了水分蒸发、挥发分分解、气相反应和粒子的表面反应,气相湍流燃烧模型采用涡旋破碎-阿累尼乌斯模型,数值求解采用算子分裂方法和FCT格式.仿真结果揭示了火焰在长管中的加速行为,计算结果与实验结果符合得较好,表明所采用的模型可以很好地应用于粉尘爆炸火焰传播的研究.

On the Flame Propagation Along Pipeline During Dust Explosion Between Interconnected Vessels

Combining experiments with numerical simulation, the flame propagation in two vessels was investigated during maize starch dust explosion, where the two vessels were interconnected with a pipeline. The explosion was ignited in one of vessels, then the flame propagated to the other one. The two-phase flow during explosion was modeled by the Eulerian-Lagrangian approach, where the well-known k-ε model was introduced to simulate the turbulence of the gas phase with the EBU-Arrhenius model introduced to simulate the gas turbulent combustion. Such factors as the water vaporization, decomposition of volatile matters and the reactions of gas phases and reactions on particles' surfaces were all taken into account in the particles' combustion model. The operator split method and FCT algorithm were used to solve the mathematical models. Simulation showed the acceleration behavior of flame propagation, and the calculated results were proved well in conformity with measured ones. It means that the developed model is valuable for investigating the flame propagation mechanisms during dust explosion.