Question

Difference between brayton and rankine cycle

Answer 1

               Braton cycle, mostly used in Jet engines, is an Air standard cycle, in it's working the air enters the engine through a ram and gets compressed with zero work, then compression takes place in compressor, heat is added to the high press. high temp. air by fuel injection and their consequent burning, now the gases try to expand doing work on turbine, usually coupled to the initially discussed compressor. So, the air can't be reused, the jet moves forward based on the exit velocity of combustive gases through nozzle many mechanical moving parts are required for the process to accomplish, and the fuel burnt is of high cost.

Rankine cycle on the other hand is one operating with steam as std. in its working, initially the liq. water is heated in a boiler (Thermal power plant) here the phase change occurs,steam is generated. the steam at higher pressure does more work on the turbine, work output got is used to drive an alternator,Rankine is a closed cycle, steam is condensed and re-used. Here the fuel burnt is not that costly, also less work input is given (although heat input is high) and more work output is drawn.

Answer 2

Brayton cycle and Rankine cycle:

• The Brayton cycle is a thermodynamic cycle that explains the workings of a constant-pressure heat engine. The original Brayton engines uses a piston expander and piston compressor.

• The Rankine cycle is an ideal thermodynamic cycle of a heat engine that converts heat into mechanical work while experiencing phase change. It is an idealized cycle in which friction losses in each of the 4 components are ignored.  

Hope it helped.....