This paper presents systematic two-zone modelling for reliable performance prediction of centrifugal compressors. In order to improve the predictive capability, a modified jet slip factor is developed and new corrections for the wake flow deviation and mass fraction are suggested on the basis of the comprehensive experimental data of the three Eckardt impellers. The proposed two-zone modelling is tested against nine sets of measured data of centrifugal compressors. The results are also compared with those obtained by mean streamline analysis. It was found that the predictions by the present two-zone modelling agree fairly well with experimental data for a variety of centrifugal compressors over the wide operating conditions.
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