Abstract This paper adopts the injection model via an array of holes in three-dimensional numerical simulations of a rotating detonation engine with hollow chamber. Premixed stoichiometric hydrogen-air mixture is used. The calculation is based on the compressible Euler equations coupled with a one-step Arrhenius chemistry model. The numerical results show that this injection model can realize stable continuously rotating detonation wave in hollow chamber. In final stable detonation flow-field, besides the multiple detonation waves rotating along outer wall of chamber, there are reverse-rotating waves which propagate in opposite direction of detonation wave. The reverse-rotating wave is much weaker than detonation wave and curved along radial direction of combustion chamber. Pressure gradient contours are used to distinguish these weak reverse-rotating waves. Detonation waves and reverse-rotating waves periodically collide with each other, forming a counter-rotating wave system. The lateral slices of flow-field at various radial positions show that the collision process of counter-rotating waves in flow-field can be divided into two types, shock-to-shock collision and detonation-to-shock collision. In addition, the intensity of detonation waves is the highest on the outer wall and gradually decreases with radius going down. Finally, the detonation wave decouples at a certain radial position and degenerates into shock wave.
Highlights Three-dimensional simulations of hollow rotating detonation engine with array-hole injection models. The existence of secondary wave (named as reverse-rotating wave in this paper) in flow-field besides detonations. The reverse-rotating wave and detonation wave form the counter-rotating waves in combustion chamber. The interaction process between counter-rotating waves in flow-field.
Numerical study of the reverse-rotating waves in rotating detonation engine with a hollow combustor
Acta Astronautica ; 170 ; 421-430
2020-02-04
10 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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