Modeling the loading factor characteristic of an industrial centrifugal compressor impeller

Test data on compressor stages demonstrate that loading factor versus flow coefficient at an impeller exit is of linear character independent of compressibility. Mathematical models of the Universal Modeling Method use this pattern at their core. In the first versions of the Method, two points deter...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2021-09, Vol.1180 (1), p.12024
Main Authors: Galerkin, Yu, Solovyeva, O, Soldatova, K, Nikiforov, A
Format: Article
Language:English
Subjects:
Centrifugal compressors
Compressibility
Design factors
Flow coefficients
Flow velocity
Impellers
Mathematical models
Model testing
Parameters
Tapering
Trailing edges
Vaneless diffusers
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Summary:Test data on compressor stages demonstrate that loading factor versus flow coefficient at an impeller exit is of linear character independent of compressibility. Mathematical models of the Universal Modeling Method use this pattern at their core. In the first versions of the Method, two points determined the loading factor characteristic: loading factor at the design point, and at zero flow rate. To calculate these parameters, the user had to define values of two empirical coefficients. The choice of the coefficient is based on experience. An attempt to obtain approximating formulas for these coefficients did not lead to a result with the required accuracy. In the modern version of the Method, the loading factor characteristic is defined by the angle of its inclination to the ordinate axis and by the loading factor at zero flow rate. The authors have researched test performances of model stages. Simple and definite equations with four geometric parameters were proposed for loading factor characteristics. The calculation error is 1%. A trailing edge shape influences the loading factor. Blunt and symmetrically tapered blades have the same loading factor. Non-symmetric tapering changes the loading factor by up to plus/minus 4% The results of impeller tests with different blade trailing edges and with vane and vaneless diffusers were generalized. The influence of these factors was taken into account as correcting coefficients in the formulas. The alternative model of loading factor characteristic modeling is included in the Universal Modeling Method and demonstrates good results in design practice.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/1180/1/012024