Numerical Comparison of Regenerative and Steam Injected Gas Turbine Cycles

Researches show that the water or steam injection,regeneration increase the thermal efficiency of the gas turbine cycles.However, there are very few computational fluid dynamics investigations for these methods. In this study, the effect of steaminjection,regeneration on the thermal efficiency,Nox emission are independently investigated both numerically andthermodynamically. Ansysy Fluent 16 software has been used for numerical simulation. In this paper, combustion occurs in adiffusion type flame. Water steam 2000 C with flow rate 30 kg,s is injected into the combustion chamber,the combustionchamber inlet air temperature is 4600C by using regeneration .Results show that the thermal efficiency increases 4.45%,6.9%with regeneration,steam injection, respectively. However, results show that Nox emission for the steam injection gas turbinecycle is 3.5 times of regenerative cycle,8.5 times of simple cycle.