In order to improve the energy conversion efficiency of the gas at the outlet of the pulse detonation combustor

a numerical calculation method was used to study the energy distribution characteristics of the gas at the outlet of the pulse detonation combustor with a pneumatic valve and detonation reinforcement structure. Results showed that the expansion process of pulse detonation gas had three stages: primary expansion

secondary expansion and over expansion. The proportion of secondary expansion time and energy was largest in a single cycle; the distribution of gas pressure potential energy

kinetic energy

internal energy and energy flow density at the outlet of the combustion chamber was mainly affected by the gas pressure

and the change law was consistent with the gas pressure; the pressure potential energy

kinetic energy and internal energy of gas increased during the primary expansion stage accounted for 479%

259% and 251%

respectively

in a single cycle; the pressure potential energy

kinetic energy and internal energy of gas increased during the secondary expansion stage accounted for 502%

576% and 581%

respectively

in a single cycle.