Closed Cycle Gas Turbines

Closed Cycle Gas Turbines Points : Closed Cycle Gas Turbines A closed cycle gas turbine, in it simplest form, consists of a compressor, heating chamber gas turbine which drives the generator and compressor, and a cooling chamber.


The schematic arrangement of a closed cycle gas turbine. In this turbine, the air is compressed adiabatically (generally in rotary compressor) and then passed into the heating chamber. The compressed air is heated with the help of some external source, and made to flow over the turbine blades, (Generally reaction type). The gas, while flowing over the blades, gets expanded. From the turbine, the gas is passed with the cooling chamber when it is cooled at constant pressure with the help of circulating water to its original temperature. Now the air is made to flow into the compressor again. It is thus obvious, that in a closed cycle gas turbine, the air is continuously circulated within the turbine.

The process 1-2 shows heating of the air in heating chamber at constant pressure. The process 2-3 show isentropic expansion of air in the turbine. Similarly, the process 3-4 shows cooling of the air at constant pressure in cooling of the air at constant pressure in cooling chamber. Finally, the process 4-1 show isentropic compression of the air in the compressor.