Authors

The use of axial-radial impellers in halocarbon refrigeration centrifugal compressors

UDC 621.515

The use of axial-radial impellers in halocarbon refrigeration centrifugal compressors

V.A. Korotkov, Tatarenko U.V.

Abstract
The article analyses effective work of refrigeration centrifugal compressor stage with radial and axial-radial impellers. Due to blockage of radial impeller inlets effective work area of refrigeration centrifugal compressor stage decreases, coefficient of performance decreasing also. Transport centrifugal compressors with axial-radial impellers are analyzed in terms of refrigerant stream characteristic and losses. Experimental results for halocarbon end stage with axial-radial impeller are given. Geometric parameters of the axial-radial impeller in question are given. Vaned diffuser is also analyzed as a part of end compressor stage, its geometric parameters being given in the article. Gas-dynamic characteristics for refrigeration centrifugal compressor with axial-radial impeller are obtained experimentally. Characteristics for full specific work of the stage prove the absence of axial-radial impeller blockage signs in performance range being analyzed. Analysis of the characteristics proves that maximum coefficient of performance for the end stage in question is pol = 0.8 is for Мu=1.0 at к=2.2. Conditional discharge coefficient is calculated and analyzed when Мu changes from 0.8 to 1.5. Application domain of model stage in question for different sizes of axial-radial impellers is recommended.

Keywords: research, centrifugal compressor stage, impeller, diffuser, characteristics, cooling capacity

All references

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