In order to investigate the impact of hot fluidic obstacles on the flame acceleration and deflagration-to-detonation transition (DDT) process, 2D numerical simulations were conducted in 6 mm channels, using ethylene and air as fuel and oxidizer, respectively. Computations show that the DDT time can be reduced by 37.5% with hot fluidic obstacles, compared to that of the smooth tube. The flame in the detonation chamber can be accelerated either by turbulence occurred around the jet hole, or by the retonation wave ejected from the jet cavity which attributes to the shock-flame interaction. Compared to the typical physical obstacles, the fluidic obstacles can decrease the total pressure loss significantly, which indicates its potential to be applied in the propulsion system.
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