PPT Slide
Fresh air is drawn into the compressor, where its pressure is raised by receiving energy from the rotating compressor blades. Although there is no heat transfer, the temperature is still increased because of the compression (adiabatic compression, isentropic compression). The high pressure air enters the combustion chamber and receives heat at constant pressure. The resulting high-temperature, high-pressure gases drive the turbine and eventually expand into the surrounding. Work output is delivered as turbine rotating mechanical energy. If we assume the exhaust gases expand to the same condition as the inlet air, then we can model the open gas-turbine processes as a closed thermodynamic cycle as described by the Brayton cycle shown earlier. Assume steady-state flow process and we can analyze the cycle based on unit mass flow: From energy balance: