1. Topic :- Brayton Cycle Group :- 4 130510119199 :-Raj Patel
:- Rajput Chintu
:-Rakholiya Pragnesh
:- Rana Karan
:- Rathod Bharatsinh

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

3. Schematic of simple cycle

4. Idealized Brayton Cycle

5. 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

6. 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:

7. 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:

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

9. 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.

10. Efficiency of Brayton Cycle:-
Net work :-

11. assume cold air conditions and manipulate the efficiency expression:

12. Using the isentropic relationships,
Define:

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

14. 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

15. Thank You