Verification and Validation of CFD Modeling for Low-Flow-Coefficient Centrifugal Compressor Stages

Vycheslav Ivanov, Yuri Kozhukhov, Aleksei Danilishin, Aleksey Yablokov and Michail Sokolov
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Vycheslav Ivanov: National Technological Initiative Center of Excellence in New Manufacturing Technologies, Peter the Great St. Petersburg Polytechnic University, 195251 Saint-Petersburg, Russia
Yuri Kozhukhov: Center for Industrial, Resource and Infrastructure Expertise and Management, Peter the Great St. Petersburg Polytechnic University, 195251 Saint-Petersburg, Russia
Aleksei Danilishin: High School of Energy Engineering, Peter the Great St. Petersburg Polytechnic University, 195251 Saint-Petersburg, Russia
Aleksey Yablokov: High School of Energy Engineering, Peter the Great St. Petersburg Polytechnic University, 195251 Saint-Petersburg, Russia
Michail Sokolov: High School of Energy Engineering, Peter the Great St. Petersburg Polytechnic University, 195251 Saint-Petersburg, Russia

Energies, 2021, vol. 15, issue 1, 1-11

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 Φ opt = 0.008–0.018 and the conditional Mach number M u = 0.785–0.804. The simulation results are compared with the experimental data. The high pressure stage-7 (HPS-7) stage with Φ opt = 0.010 and M u = 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.

Keywords: centrifugal compressor; CFD; verification; validation; low flow; digital twin (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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