Numerical Simulation of Effects of Fluidic Obstacles on Initial Flame Speed Acceleration in a Detonation Tube

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.