布雷顿循环是一种热力学循环,是吸气式喷气发动机以及燃气轮机的工作原理。其命名是按en:George Brayton来进行的，但实际上最早使用的是en:John Barber。有时也被称为焦耳循环。

The Brayton cycle is a thermodynamic cycle that describes the workings of a constant pressure heat engine.The original Brayton engines used a piston compressor / expander Gas turbine engines and airbreathing jet engines use the Brayton cycle. Although the Brayton cycle is usually run as an open system (and indeed must be run as such if internal combustion is used), it is conventionally assumed for the purposes of thermodynamic analysis that the exhaust gases are reused in the intake, enabling analysis as a closed system.