Based on Euler equations with one-step chemical reaction model in generalized coordinates

three-dimensional numerical simulation of the continuously rotating detonation engine (CRDE) were performed to investigate the effect of inlet total pressure on its parametric properties. It is found that the peak value of the detonation wave increases with the inlet total pressure; however

the choking ratio of the injection Laval nozzle along the head end is not influenced by it. Across the whole head end of CRDE

combustible gas is injected into the combustion chamber subsonically for different inlet total pressures. With the increase of inlet total pressure

the average pressure inside the chamber increases obviously

but the average axial velocity changes little. The mass flux

force and specific impulse of CRDE increase with the inlet total pressure. However

the ratio of the mass flux of CRDE to the maximum mass flux of the injection Laval nozzle remains the same under different inlet total pressures

almost equal to the choking ratio of the injection Laval nozzle. As the maximum mass flux of the injection Laval nozzle has a linear growth with the inlet total pressure

the above analysis provides a theory explanation about why the mass flux of CRDE increases linearly with the inlet total pressure.