Secondary shock wave in rotating detonation combustor

摘要

The secondary shock wave in rotating detonation combustor is studied by the combination of numerical simulation and experiments. Based on the pseudo-nozzle flow in the post-detonation zone, the influencing factors which cause the existence of secondary shock wave are clarified and then verified by experiments. The results show that the secondary shock wave is caused by the over-expansion of detonation products. An increase in the ratio of stagnation pressure over backpressure, or inlet mass flux reduces the degree of products expansion, and in turn alleviates or eliminates the occurrence of the secondary shock wave. However, the experimental results show that the increase of combustor length leads to the occurrence of double-wave collision under the case of low mass flow rate. The interactions between the remnant hot products and the reflection of secondary shock wave at the injection plane are supposed to the mechanism of the mode transition. (C) 2019 Elsevier Masson SAS. All rights reserved.