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The performance improvement of a small centrifugal compressor for waste water treatment has been conducted by the design change of vaneless diffuser and volute casing. Existing two compressors use a common impeller, but the width and length of the vaneless diffuser and the cross-sectional shape of the volute casing are different, respectively. Based on the experiment of the existing two compressors and their CFD results, the designof the vaneless diffuser and the volute casing has been changed. It was found that the strength of the interaction among the volute tongues, the vaneless diffusers and the impellers of two existing/one improved compressors, was affected by the cross-sectional area and inlet radial length of the volute casing including system losses’ change. Theefficiency of the impeller with one existing design was increased as the decrease of the width of the vaneless diffuser,but losses at the diffuser were accumulated. In conclusion, approximately 2.88%p efficiency increase at the designpoint of the new compressor with the improved design has been confirmed by CFD analysis results.

A study on the vaneless diffuser and volute casing design for the improvement of small centrifugal compressors