Detonation propagation limits in hydrogen-oxygen mixtures in a tube filled with repeated perforated plates

Abstract

This study investigated the propagation behaviors of quasi-detonations in a round tube filled with repeated perforated plates. Stoichiometric hydrogen-oxygen mixtures at different initial pressures were tested. Photodiodes and soot foil were used to record detonation velocity and cellular structure between two adjacent perforated plates. The orifice diameter (d), hole spacing (l) of the perforated plate and the obstacle spacing (S) were varied. The results show that the ratio of the overall jet diameter (D0, defined as the diameter of the circumcircle of the orifices) to the detonation cell size (λ) is in the range of 12–14 for the occurrence of Chapman-Jouguet detonations. The combustion regimes are affected by l/d, i.e., smaller l/d results in higher combustion velocity. At the detonation propagation limits, the results confirm the criterion L/λ>7, in which L=(S+D)/[2(1−1−BR)], D and BR are, respectively, the tube diameter and blockage ratio of the perforated plate.