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.

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С прискорбием вынуждены сообщить что на 89-м году ушел из жизни профессор кафедры «Компрессорная, вакуумная и холодильная техника» Анатолий Михайлович Симонов.

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А. В. Зуев, Ю. В. Кожухов, А. М. Яблоков, А. М. Данилишин, Л. В. Гилева. Задачи статической прочности и динамика роторов энергетических машин : учеб. пособие / А. В. Зуев [и др.]. – СПб. : ПОЛИТЕХ-ПРЕСС, 2020. – 101 с.

Ю. В. Кожухов, И. С. Янин, С. В. Карташов, Д. А. Сергеев, И. В. Ильин, А. М. Яблоков. Экономика энергетики : учеб. пособие / Ю. В. Кожухов [и др.]. – СПб. : ПОЛИТЕХ-ПРЕСС, 2020. – 124 с.

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The article presents the results of a numerical study of the influence of the theoretical head coefficients on the characteristics of a low-flow stage of a centrifugal compressor. The study was conducted in the Ansys CFX 19.2 software package. As a result of a numerical study, it was found that the drop in the efficiency of the compressor stage with an increase in the theoretical head coefficient is associated with a decrease in the efficiency of the stationary elements due to the increased absolute speed behind the impeller. At the same time, an increase in the theoretical head coefficient leads to a decrease in losses associated with the coefficient 1 + β_lk + β_fr, and therefore, an increase in the polytropic efficiency of the impeller is observed at values ​​of the theoretical head coefficient Ψt ≤0.64.