In this study, the influence of wet gas on the fluid performance of a centrifugal compressor was evaluated using a test facility in the Norwegian University of Science and Technology, NTNU. The experimental results indicated that the polytropic efficiency decreased with increases in LMF. One factor of decrease of the polytropic efficiency was an increase in the shaft power. Moreover, we hypothesized that the liquid film on the inner wall of the impeller was discharged from the trailing edge at a circumferential speed by a centrifugal force. Then an expression to predict the shaft power under wet gas conditions on the basis of the hypothesis was built and it was verified that the ratio of the predicted and experimental shaft power agreed well.

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