Humphrey cycle

The Humphrey cycle is the thermodynamic cycle occurring detonation engines such as rotating detonation engines, the pulse detonation engines, and pulse compression detonation systems.

It may be considered to be a modification of the Brayton cycle in which the constant-pressure heat addition process of the Brayton cycle is replaced by a constant-volume (isochoric process) heat addition process.

[1] It is a form of pressure gain combustion.

Hence, the ideal Humphrey cycle consists of 4 processes:

The pressure-volume diagram of an idealized Humphrey cycle