Abstract
The article investigates the effect of compressor pressure ratio, turbine inlet temperature, ambient relative humidity and ambient temperature on the performance parameters of an air-cooled gas turbine cycle with evaporative cooling of inlet air. Air-film cooling has been adopted as the cooling technique for gas turbine blades. The mass of coolant required for turbine blade cooling is calculated for a selected range of ambient conditions and found to vary with temperature drop achieved in the evaporator. The effect of ambient temperature and ambient relative humidity on plant efficiency and plant-specific work is computed at different TIT and r p,c and it was found that the rate of increase in these performance parameters are more pronounced at higher TIT and r p,c. The results indicate that a maximum temperature drop of 21 °C is achieved in the evaporator. The inlet cooling is found to increase the efficiency by 4.1% and specific work by 9.44 %.
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