Performance of rotating detonation engine with stratified injection

Abstract

In this study, a numerical study based on Euler equations and coupled with detail chemistry model is used to improve the propulsion performance and stability of the rotating detonation engine. The proposed fuel injection called stratified injection functions by suppressing the isobaric combustion process occurring on the contact surface between fuel and detonation products, and thus the proportion of fuel consumed by detonation wave increases from 67% to 95%, leading to more self-pressure gain and lower entropy generation. A pre-mixed hydrogen-oxygen-nitrogen mixture is used as a reactive mixture. The computational results show that the propulsion performance and the operation stability of the engine with stratified injection are both improved, the temperature of the flow field is notably decreased, the specific impulse of the engine is improved by 16.3%, and the average temperature of the engine with stratified injection is reduced by 19.1%.

Numerical Investigation on Pulse Detonation Engine Performance Under Different Equivalence Ratio

“…They indicated that the boundary layer has a negligible effect on the detonation wave velocity and that the pressure in the boundary layer is nearly constant. Therefore, in numerical studies focused on detonation-based engines, viscosity, mass diffusion, and thermal conduction can be neglected, and the twodimensional governing equations are reactive Euler equations [30][31][32][33][34][35]. The Euler equations with source terms in Cartesian coordinates are expressed in Equation ( 1) [36].…”

Mixing and combustion in supersonic/hypersonic flows

“…They also proposed a fuel injection scheme, namely stratified injection, to improve the propulsion performance and stability of the rotating detonation engine. This enables a greater gain in self-pressure and a reduction in the generation of entropy (Lei et al, 2020b). With these enhancements, the specific impulse of the engine was improved by 16%, and its average temperature was reduced by 19.1%.…”