Topic :- Brayton Cycle Group :- 4 130510119199 :-Raj Patel 130510119200:- Rajput Chintu 130510119201 :-Rakholiya Pragnesh 130510119202:- Rana Karan 130510119203:- Rathod Bharatsinh

Brayton Cycle Introduced by George Brayton (an American) in 1872 Used separate expansion and compression cylinder Constant Combustion process

Schematic of simple cycle

Idealized Brayton Cycle

Brayton Cycle 1 to 2--isentropic compression 2 to 3--constant pressure heat addition (replaces combustion process) 3 to 4--isentropic expansion in the turbine 4 to 1--constant pressure heat rejection to return air to original state

Brayton cycle analysis Brayton cycle operates between two constant pressure lines ,the pressure ratio is important. The pressure ratio is not a compression ratio. Efficiency: Net work:

Process 1 To 2 :- isentropic compression in compressor When analyzing the cycle, we know that the compressor work is in (negative). It is standard convention to just drop the negative sign and deal with it later:

Process 2 to 3 :- constant pressure heat addition - treated as a heat exchanger Process 3 to 4 :- isentropic expansion in turbine

Process 4 to 1 :- constant pressure heat rejection We know this is heat transfer out of the system and therefore negative. they’ll give it a positive sign and then subtract it when necessary.

Efficiency of Brayton Cycle:- Net work :-

assume cold air conditions and manipulate the efficiency expression:

Using the isentropic relationships, Define:

Then we can relate the temperature ratios to the pressure ratio: Plug back into the efficiency expression and simplify:

Applications of Brayton cycle Power generation - use gas turbines to generate electricity…very efficient Marine applications in large ships Application in commercial aircraft, military aircraft

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