Effect of obstacles behind the pre-detonator tube on the re-initiation of diffracted detonation wave

Abstract

The re-initiation of diffracted detonation wave is simulated by the DCRFoam. The detonation waves propagated from the pre-detonator tube to the main chamber are formed by 2H2-O2-7Ar. Due to the sudden expansion of cross-section, the detonation wave will be attenuated by the rarefaction effect, resulting in detonation failure. Introducing obstacles behind the pre-detonator is an effective method to realize the diffracted detonation re-initiation. This study aims to optimize the detonation transmission by considering the height (h) of obstacles and the distance (w) between obstacles and the exit of the pre-detonator. Results show that, when 15.31311w2-1342.52507w+29435.20137≤h ≤ 0.00239w2+0.38038w+10.95694 (10 mm ≤ h ≤ 30 mm, 10 mm ≤ w ≤ 50 mm), the diffracted detonation wave can realize re-initiation. When w is constant, the formation distance of stable detonation first decreases and then increases with the increase of h. The same law of w can be found when h is unchanged.