Abstract
The initiation and propagation of rotating detonation waves (RDWs) are key techniques for the engineering application of rotating detonation engine (RDE). In this paper, the Naiver-Stokes equation of the three-dimensional unsteady reaction flow has been solved using one step hydrogen/air reaction mechanism to investigate the formation and propagation processes of RDWs under the non-premixed condition with different inlet equivalence ratios. The numerical results show that compared with RDWs generated by premixed propellants, less stable propagation processes and lower detonation fronts can be observed in RDWs generated under the non-premixed condition. It can be also concluded that the equivalence ratio has a great effect on the formation and propagation of RDWs. The formation time of stable RDWs increases when the ER changes from 1.0 to 1.3. However, under the conditions of the two ERs, similar re-initiation phenomena is observed in the evolution process of RDWs and a three-wave mode has been established.
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