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The article presents the results of a numerical study of the influence of the theoretical head coefficients on the characteristics of a low-flow stage of a centrifugal compressor. The study was conducted in the Ansys CFX 19.2 software package. As a result of a numerical study, it was found that the drop in the efficiency of the compressor stage with an increase in the theoretical head coefficient is associated with a decrease in the efficiency of the stationary elements due to the increased absolute speed behind the impeller. At the same time, an increase in the theoretical head coefficient leads to a decrease in losses associated with the coefficient 1 + β 1k  + β fr  and therefore, an increase in the polytropic efficiency of the impeller is observed at values of the theoretical head coefficient  ψt  ≤0.64.

Analysis of the influence of theoretical head coefficient on the low-flow centrifugal compressor stage characteristics