Brayton Cycle

The air-standard Brayton cycle is a theoretical cycle for gas turbines. This cycle consists of two reversible adiabatic or isentropic processes and two constant pressure processes.
This thermodynamic cycle is represented on p-V and T-s coordinates, is similar to diesel cycle in compression and heat addition. The isentropic expansion of diesel cycle is further extended followed by constant pressure heat rejection.

Pressure-volume and Temperature-entropy diagram for the brayton cycle

p-V and T-s diagram for the air-standard Brayton cycle

1-2: Isentropic process
2-3: Isobaric process
3-4: Isentropic Process
4-1: Isobaric process

Thermal Efficiency can be calculated by the formula
Brayton-cycle thermal efficiency
Where ‘k’ is the specific heat ratio Cp/Cv.

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