The Brayton cycle is a thermodynamic cycle that can be invented by George Brayton in 1872.
The Brayton cycle is a type of power cycle that utilizes and ideal gas to generate power from a type of fuel used to heat the air.
In the Brayton cycle, two reversible adiabatic processes and two constant pressure process are done in a heat engine.
The Brayton cycle consist of four processes following below :
In general, the thermal efficiency of the Brayton cycle is defined as the ratio of the work output to the heat input at the high temperature.
The Brayton cycle is a type of power cycle that utilizes and ideal gas to generate power from a type of fuel used to heat the air.
What is the Brayton cycle?
In the Brayton cycle, two reversible adiabatic processes and two constant pressure process are done in a heat engine.
Process of Brayton cycle :
- Adiabatic quasi-static process compression process: In this process compressor takes fresh ambient air and compressed it to a higher temperature and pressure.
- Constant pressure heat addition process: In this process, compressed air is sent to the combustion chamber where fuel is burnt at constant pressure.
- Adiabatic quasi-static expansion process: High-temperature gases expand to the ambient temperature in the turbine and produce the power.
- Constant pressure heat rejection process: The exhaust gases leave the turbine and air back to its initial condition.
The efficiency of the Brayton cycle :
In general, the thermal efficiency of the Brayton cycle is defined as the ratio of the work output to the heat input at the high temperature.
ŋth = W
/ QH
For ideal gas can
now we expressed in terms of temperature :
ŋth =
NetWork / Heat Input = WT – WC / Qin
= cp
[ (T3 – T4 ) – (T2 – T1) ] / cp
(T3 – T2)
= 1 – [ (T4 – T1) /
(T3 – T2) ]
Where,
WT =
Work is done by the gas in the turbine
WC =
Work was done on the gas in the compressor
cp =
Heat capacity ratio