A Water Atomization Cooling (WAC) system is a kind of inlet fogging technique with overspray, which reduces the compression work due to the intra-cooling effect of over-injected droplet evaporation. The WAC system has been successfully applied to mid- and large-sized gas turbines, but its application to small turbines is rare. Hitachi developed a 3.7 MW Advanced Humid Air Turbine (AHAT) plant as a national project from 2004 to 2006. The plant has a two-stage centrifugal compressor with a total-to-total pressure ratio of 8.3 without the WAC system. We compare theoretical and experimental evaporation behaviors of injected droplets into the compressor and their effect on the compressor characteristics, when the WAC system was applied to the AHAT plant.

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