Diffraction and re-initiation of detonations behind a backward-facing step

Cellular pattern evolution in gaseous detonation diffraction in a 90°-branched channel

“…Their results are consistent with cellular pattern records published in [11]. Ohyagi et al [15] also studied the diffraction and reinitiation of detonation behind a backward-facing step. Papalexandris [16] used numerical simulation to analyze the influence of the top corner of a wedge on the structure of the reaction zone for long and short wedges.…”

Initiation and propagation of detonation waves in combustible high speed flows

“…Under this condition, a detonation wave diffracts due to inward propagating rarefaction waves that originate from the position where there is an abrupt change in the area, and a part of the detonation front is decoupled into a shock and a reaction front [9][10][11]. As the inner diameter of the initiation tube, 16 mm, is close to the critical diameter of 13k, a re-initiation of detonation is required for its further propagation.…”

Numerical simulation of detonation failure and re-initiation in bifurcated tubes

“…Kuznetsov et al [9] studied detonation propagation, decay and re-initiation in nonuniform hydrogen-air mixtures. Ohyagi et al [10], studied detonation diffraction, failure and reinitiation in backwards facing step. Wang and Guo [1,2] carried out experimental and numerical studies of detonation propagation in bifurcated tubes filled with different hydrogen concentrations and pressures and demonstrated the re-initiation of detonation by the leading shock reflection in the vertical branch of the tube.…”

“…Most studies on detonations, including their failure and re-initiation, have been carried out in 2D [1,2,[7][8][9][10] and despite that the computational times have always been high, adding the third dimension to the model would increase the number of grid points and therefore the computational cost drastically. However Houim et al [34] concluded any 3D effect should not qualitatively influence the structure of the predicted waves.…”