Brayton Cycle
The Brayton Cycle or Joule Cycle is a theoretical cycle on which run the constant pressure gas turbines. A gas turbine is akin to petrol and diesel engines in its working medium and internal combustion. However, the processes of compression, combustion and expansion take place in different components in a gas turbine plant. Further, the gas turbine is a rotary machine and operates under steady and continuous supply of working medium.
The Cycle consists of two isentropic processes (Compression and expansion) and two constant pressure processes (Combustion and exhaust). The sequence of operation is :
1—2 : Isentropic compression air in rotary compressor which raises the pressure and temperature of air from p1 , T1 to p2 , T2.
2—3 : The air at condition 2 is passed through a heat exchanger where heat is externally supplied to it at constant pressure . This raises the temperature from T2 to T3.
3—4 : Isentropic expansion of high temperature and high pressure air in the turbine during which work is done by the system.
4—1 : The air at state point 4 is passed through a heat exchanger and heat is rejected at constant pressure . This cools the air to initial condition 1 and the cycle is completed.
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