Definition
The constant-pressure thermodynamic cycle that describes the operation of a gas turbine engine. The cycle consists of four continuous events: air is drawn in and compressed, fuel is added and burned at essentially constant pressure, the hot expanding gases pass through a turbine that extracts energy to drive the compressor, and the remaining energy is discharged through the exhaust to produce thrust or shaft power.
Plain English
The four-step process by which a jet or turbine engine works: suck in air, squeeze it, burn fuel in it, then blow it out the back. Each step happens continuously and in a different part of the engine.
Context Anchor
Seen in aircraft turbine engine theory, especially when learning how jet and turboprop engines produce power.
Derivation
Named after George Brayton, an American engineer who patented an engine in the 1870s using this constant-pressure combustion principle. Knowing the name comes from a person, not a technical word, prevents the reader from trying to decode 'Brayton' as a term.
Why Pilots Care
Understanding the cycle helps pilots grasp why turbine engines respond differently to temperature, altitude, and power changes than piston engines do.
Analogy
Think of it as a four-step path for air: squeeze it, heat it, let it push on the engine, then send it out. The same pattern repeats continuously while the engine is running.
Grounding Statement
The Brayton cycle is to turbine engines what the Otto cycle is to piston engines: it describes how the engine turns fuel into useful work.
Intuition Check
Do not think of “cycle” as a physical part inside the engine. Here, it means the repeating energy process the air goes through as the engine runs.
Example Sentence 1
The Brayton cycle's four events of intake, compression, combustion, and exhaust occur simultaneously in different sections of the turbine engine.
Example Sentence 2
Higher turbine temperatures improve the efficiency of the Brayton cycle in flight.