Influence of axial and circumferential lengths of combustion chamber on gas-liquid two-phase rotating detonation characteristics,

In order to study the influences of axial and circumferential lengths of rotating detonation engine combustion chamber on gas-liquid two-phase rotating detonation characteristics, the theoretical model of gasoline/oxygen-enriched air two-phase rotating detonation with chemical reaction was solved by conservative element and solution element (CE/SE) method. The flow field structure of gas-liquid two-phase rotating detonation was obtained, and the influences of the axial and circumferential lengths of the combustion chamber on the flow field, detonation wave propagation characteristics and thrust performance of the engine were analyzed. The calculation results showed that the axial length had little effect on the upstream flow field of the combustion chamber, but had a significant effect on the downstream flow field parameters. With the increase of the axial length, the outlet pressure, temperature, density and circumferential velocity of the combustion chamber decreased, while the axial velocity increased gradually, and the average thrust density and fuel specific impulse of the engine increased first and then decreased. When the circumferential length was too short, it was difficult to form a self-sustaining propagating detonation wave in the combustion chamber. As the circumferential length increased, the strength of upstream detonation wave increased, and the corresponding flow field parameters increased, however, the thrust performance of engine decreased slightly.