Abstract
In this paper, the numerical model of a centrifugal compressor low-flow stage is verified. The gaps and labyrinth seals were simulated in the numerical model. The task was to determine the optimal settings for high-quality modeling of the low-flow stages. The intergrid interface application issues, turbulence and roughness models are considered. The obtained numerical model settings are used to validate seven model stages for the range of the optimal conditional flow coefficient with Φopt = 0.008–0.018 and the conditional Mach number Mu = 0.785–0.804. The simulation results are compared with the experimental data. The high pressure stage-7 (HPS-7) stage with Φopt = 0.010 and Mu = 0.60 at different inlet pressure of 4, 10 and 40 atm is considered separately. Acceptable validation results are obtained with the recommended numerical model settings; the modeling uncertainty for the polytropic pressure coefficient δη*pol < 4% for the efficiency coefficient δη*pol exceeds the limit of 4% only in the two most low-flow stages, U and V.
Highlights
Improving the efficiency of centrifugal compressor low-flow stages is hindered due to the small relative width of the flow part channels [1]
The largest number of works are concentrated on medium- and high-flow stages with 3D impellers, while relatively few works are concentrated on the verification and validation of numerical calculations with experimental data in stages with low-flow coefficients [6,7,8,9,10,11,12,13]
The optimal settings settingsof ofaalow-flow low-flowstage stagenumerical numericalmodel model are determined this paAs result of theofnumerical modelmodel verification, it can it becan concluded that forthat low-flow stages per.a As a result the numerical verification, be concluded for low-flow stages it is advisable to use the low-Reynolds turbulence model k-ω
Summary
Improving the efficiency of centrifugal compressor low-flow stages is hindered due to the small relative width of the flow part channels [1]. CAD design models of centrifugal compressor stages can be used as virtual models for working in various technological processes or as independent units for checking the quality of the project instead of experimental work. In this way, changes can be made to the project before it is made.
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