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

The re-initiation of diffracted detonation wave is simulated by the DCRFoam. The detona-tion 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 atten-uated 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+29435.201370.00239w2+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.(c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.