Numerical Investigation of the Detonation Cell Bifurcation with Decomposition Technique

Abstract

Bifurcation of the characteristic cells into multiple smaller cells and decay of those cells into single large characteristic cell is observed frequently. In the present study the bifurcation phenomenon of the detonation front is investigated for marginally unstable detonations using decomposition technique. Numerical analysis is carried out with detailed chemical kinetics for detonation propagation in H2/O2 mixtures at 10 kPa. The dynamic characteristics of the instability at the detonation front, such as the local oscillation frequency and the coherent spatial structure of the oscillation are also studied with dynamic mode decomposition (DMD) technique. The coherent structures of the primary and secondary detonation cells are analyzed during the cell bifurcation process and the mechanism in which the secondary cells are formed is investigated. It is demonstrated that the modal analysis categorizes the instability phenomena clearly and can be effectively utilized to identify the origin and source of the instability.

Validation of High Speed Reactive Flow Solver in OpenFOAM with Detailed Chemistry

“…Detonation simulations have been performed extensively in the last few decades focusing on several aspects such as, the canonical detonation problem [4,[14][15][16][17][18][19][20][21][22][23], numerical issues [6], detonation transmission in complex domains [24,25] and so on, due to their applicability in fields like propulsion, safety in hydrogen handling, and energy generation. After reviewing a good number of representative literature in the numerical detonation field, a concise review is presented here.…”