In order to study the ejecting mechanism of pulse detonation engine (PDE)-ejector, the paper presents numerical simulation on the flow field parameters along the PDE detonation chamber in the conditions of ejector with different structure or axial positions by using CFD. The entraining processes of ejector with different structure are simulated at a 2D axisymmetric model to completely reveal the ejecting mechanism. It is concluded that there are three basic parts of the PDE-ejector cycle by analyzing an entire process of numerical simulation: (1) the detonation wave exists from the PDE followed by a flow reversal out of ejector inlet, (2) the generation of positive entrainment at the ejector inlet, (3) steady entrainment accompanied with strong flow.
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