Working Principle of Gas Turbine ::

The working principle of gas turbine is to convert the chemical energy of fuel into mechanical energy through combustion process, and then the mechanical energy is converted by a generator into electrical energy. Gas turbine works with Brayton cycle and its working fluid is gas. The simplest gas turbine system consists of 3 (three) main components: compressor, combustor and turbine, with the arrangement as shown in Figure 1.

 

 

The working principle of gas turbine system is the atmospheric air goes into the compressor which serves to suck air and raise the pressure of air, so that its pressure will rise. Then the high pressure air flow into combustion chamber. In the combustion chamber the fuel is sprayed into the air flow, resulting in the burning/combustion process. The combustion process takes place at constant pressure, so it can be said that the combustion chamber is used only to raise the temperature of air. High-temperature combustion gas is then entered into a gas turbine in which its energy is used to rotate turbine blades. As much as ± 60% of power generated by turbine is used to rotate compressor itself, the remainder is used to turn generator.

This ideal cycle consists of 2 (two) Isobars processes that occur in the combustion chamber and exhaust process of used gases, and 2 (two) isentropic processes that occur in the compressor and the expansion of gases in the turbine.

Source :  http://steamofboiler.blogspot.com/2011/09/working-principle-of-gas-turbine.html