Effect of axial position of ejectors with variable cross-section area on performance of a pulse detonation rocket engine

The thrust augmentation was experimentally investigated for ejector axial position with variable cross-section area, using kerosene as fuel and oxygen as oxidizer at the equivalence ratio 1.0 and the working frequency from 5Hz to 15Hz. Ejector includes the diverging ejector and the converging ejector. The results show that the thrust augmentation is influenced largely by ejector axial position. Divergent ejector fixed downstream has a greater thrust augmentation which can be about 102.57%. However, the thrust augmentation of convergent ejector has the contrary rule whose maximum value can reach 86.7%. Ejectors with variable cross-section area can provide positive thrust augmentation whether it is fixed downstream or upstream.