Orateur
Description
Rotating Detonation Combustors (RDC) possess a theoretical capacity to increase the engine thermodynamic efficiency compared to the deflagration combustion. Achieving real pressure gain with an experimental RDC remains unattainable because of loss factors depending on the chamber and injector designs, suggesting the need to characterize and further optimize their performance. Large Eddy Simulation of a pintle H2/Air injector are performed using inputs from a hot-fire test performed at TU Berlin for the H2POWRD project. First, a cold-flow injection simulation in a chamber angular sector shows good mixing capabilities of the injector. To model the refill process between successive detonation passages, a transient reinjection simulation is performed using the post-detonation state from a simplified rotating detonation simulation as initial condition. This reinjection simulation demonstrates the back-flow effect past the detonation and the parasitic deflagration that occurs when the injected fresh propellants are put in contact with the combustion products. This study provides an analysis of the injector performance and can act as a reduced model of a full RDC with rotating detonation.