Relationship between ignition delay time and cell size of H2-Air detonation

In this paper, the coupling mechanism between shock dynamics and chemical reaction kinetics of the self-sustained propagation of H2-Air detonation was studied. Two-dimensional numerical simulations were conducted and four chemical reaction kinetics models were used. The results demonstrate that the ignition delay time plays a significant role in the detonation propagation since it directly affects the detonation front structure. The longer the ignition delay time is, the bigger the cell size will be. The period of the movement of triple-wave points almost equals to ignition delay time of the reactants in the induction zone. This mechanism is very important for the hydrogen safety.