A thermodynamic method of determining the work input to a centrifugal compressor operating with water injection is presented. The method was used to compute the work input to a double-entry centrifugal com¬pressor, which was operated at design equivalent impeller speed over a range of inlet water-air ratios and varying weight flow. The work input as determined in this manner agreed quite well with a measured shaft input when the concentration of water droplets at the compressor-outlet measuring station was small. As the concentration was increased, a more pronounced scattering of the data resulted.
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