Interaction between porous media and detonation wave on transpiration cooling for rotating detonation engine

Transpiration cooling in a rotating detonation engine (RDE) is a typical heat and mass transfer problem involving the interaction between porous media and the detonation wave. This phenomenon exhibits temporal and spatial instability. This study employs numerical simulation methods, using water and kerosene as coolants, and a 10-step reaction model to simulate the interaction between porous media and detonation wave. It investigates the transpiration cooling effects of various porous media structures within the RDE combustion chamber. The aim is to explore the relationship between the propagating detonation wave and the transpiration cooling, and to analyze the heat and mass transfer processes, as well as the thermal protection effects. The results reveal that when the porous medium is placed too close to detonation wave, the wave’s structure is disrupted and eventually dissipates, which makes it difficult to inject coolant. Increasing the width of the porous medium improves the cooling effect, extends the effective cooling distance, and enlarges the effective coverage of the coolant. As the detonation wave propagates, the dominance alternates periodically between the combustion gases and the coolant, inducing distinct vortices within the porous medium. These findings offer valuable insights for the study of unsteady transpiration cooling and practical applications of the RDE.