Abstract
The oblique detonation wave in two-phase kerosene–air mixtures over a wedge is numerically studied. The gas-droplet reacting flow system is solved by means of a hybrid Eulerian–Lagrangian method. We elucidate the initiation feature of the two-phase oblique detonation. The effects of the spray equivalence ratio on the initiation characteristics of a detonation and the transition from oblique shock to detonation are taken into account. As the mass flow rate of the droplets increases, a shift from a smooth transition to an abrupt one is observed, and the initiation length of the oblique detonation is increased. The initiation length as well as the transition pressure depends on the spray equivalence ratio. The observed distribution is a ∧-shape for an equivalence ratio ranging from 0.4 to 1.4, and has its maximum value around unity. This is mainly owing to the interplay between the evaporative cooling and chemical heat release. The results show that the evaporative cooling effects have more influence in the fuel-lean side, but the heat release effects predominate in the fuel-rich side. In particular, the decrease of the initiation length with the increase of the spray equivalence ratio in the fuel-rich side is also due to the increase of the inflow Mach number and the corresponding increase of the post-shock temperature and pressure.
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