Based on the two-dimensional(2-D) numerical simulation of continuous detonation engine in an annular chamber

the paths of fluid particles starting at the injection plate were tracked

and their thermodynamic condition was plotted on a p-v and T-s diagram.The main factors that affect the paths and the fluctuation of physical parameters were discussed in detail.The thermodynamic cycle efficiency and net work output were obtained from the diagrams.The numerical thermodynamic cycle diagrams show very similar structure to the ideal ZND(Zeldovich-Neumann-Doring) model.The superior performance of CDE(continuous detonation engine) is further defined.