Quenching limits and dynamics of multidimensional detonation waves confined by an inert layer

S Taileb (1) , J. Melguizo-Gavilanes (1) , A. Chinnayya (1)

1 PPrime [Poitiers] - Institut Pprime [UPR 3346]

Two-dimensional inviscid simulations are conducted to assess the effect of chemistry modeling on the detonation structure and quenching dynamics of detonations propagating into a semiconfined medium. Two different simplified kinetic schemes are used to model the chemistry of stoichiometric H 2-O 2 mixtures: single-step and three-step chain-branching chemistry. Results show that the macroscopic characteristics of this type of detonations (e.g. detonation velocity and cell size irregularity) are very similar for both models tested. However, their instantaneous structures are very different before and upon interaction with an inert layer. Specifically, the minimum reactive layer height, h crit , capable of sustaining detonation propagation is larger when a more realistic description of the chemistry is used. This outcome suggests that the quenching limits predicted numerically are dependent on the choice of chemical modeling used.

Mots clés: Detonation dynamics; simplified kinetics; quenching limits; numerical simulation

Domaines: Sciences de l'ingénieur [physics]; Milieux fluides et réactifs

S Taileb, J. Melguizo-Gavilanes, A. Chinnayya. Quenching limits and dynamics of multidimensional detonation waves confined by an inert layer. 11th U.S. National Combustion Meeting, Western States Section of The Combustion Institute, Mar 2019, Pasadena, United States. Paper ID: 71DE-0191. ⟨hal-02365203⟩