Abstract
In this paper, three-dimensional numerical investigations are conducted to characterize the slot-hole rotating detonation combustor under various numbers of fuel holes (40, 60, 90 and 120). The effects of fuel holes number on detonation wave are discussed according to three typical stages which are non-reacting stage, detonation formation stage and detonation stable stage respectively. Numerical results show that the number of fuel holes has a significant impact on the formation and propagation characteristics of rotating detonation wave. On detonation formation stage, the general formation processes of detonation wave are similar under different holes numbers, which mainly includes the collision of transmit pressure waves and reactant re-initiation phenomenon. Within the scope of this study, as the increase of holes number, shorter axial length is taken to close to the global equivalence ratio on non-reacting stage. For 90-hole case, it takes the shortest time to establish self-sustained detonation wave and has the highest propagating stability. Additionally, dual-wave mode is obtained when the holes number is 90, while single-wave mode occurs when the holes numbers are 40, 60 and 120. The propagating direction of RDW is reversal when the holes number is 60 and 120, the reason is related to the collision spot of pressure wave and distributions of equivalence ratio. Besides, the establishment of new detonation wave is dependent on the intensity of accumulated pressure wave and the distribution of equivalence ratio.
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