An analysis on efficiency of a water injection gas turbine with rotor air cooling

A practical thermodynamic model for the efficiency of a single cycle water injection gas turbine (WIGT) with rotor air cooling (RAC) was developed and validated by comparing to the real data from the power plant in Macau. The results obtained from the present model has higher accuracy compared to previous models due to the application of dynamic values of the parameters such as injected steam ratio and rotor cooling air temperature. The optimal value for the ratio of injected steam is obtained based on the present thermodynamic model and validated by the measured electrical efficiency. The present model is helpful in the operation of the WIGT power plant.