Abstract: Recently，researchers raised fluidic obstacle method as a new approach for enhancement of DDT (Deflagration to Detonation Transition). A numerical simulation was utilized to investigate fluidic and physical obstacles in detonation tubes in order to develop the criteria for fluidic obstacle. The results show that the fluidic jet is more efficient for inducing turbulence and flame acceleration than physical obstacles. The jet also enhances turbulence intensity around flamelet at the jet side. As the momentum of the jet is constant，flame speed does not increase monotonically with jet velocity. There is an optimal velocity which can achieve the best effect for flame acceleration.

Key words: Fluidic obstacles；DDT；Flame speed；PDE；Numerical simulation

摘要： 流体障碍物是近来提出的一种加速火焰由缓燃转变为爆震(Deflagration to Detonation Transition，简称DDT)的新技术。为探索流体障碍物的设计准则，以带有不同类型障碍物的爆震管段为研究对象开展数值研究。结果表明:流体障碍物对火焰的加速作用优于固体障碍物。射流的存在加强了火焰面贴近射流一侧的湍流强度。当射流的动量一定时，对火焰加速传播过程的促进效果与射流初始速度不是单调递增的关系，存在某一最优初速使得火焰加速效果最好。

关键词: 流体障碍物；DDT；火焰传播速度；脉冲爆震发动机；数值模拟