The distributions of detonation parameters in detonation chamber were gained by analytical numeration

and then multiple-cycle numerical simulations were carried out after detonation wave broke up to shock wave.The analysis on the mechanism of unsteady ejection shows that the process of unsteady ejection can be divided to four stages

and the ejection performance of annular pulse detonation duct is stronger than round pulse detonation duct.Different structures and parameters could induce different time-averaged thrust augmentations.The better shape of the ejector inlet

interior surface

ejector length-to-diameter ratio and axial placement were obtained through analysis

offering references to augment the performance of pulse detonation engine.