Development of highly efficient centrifugal-compressor series for turbocooling machines

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Abstract

BACKGROUND: Currently, demand for centrifugal-compressor stages with a high pressure ratio is increasing. Such requirements prompt the use of high pressure stages with high circumferential speeds of u2>300 m/s, which leads to increased levels of conditional Mach number and consequently to pressure losses. Work for stage efficiency increases the energy consumption, and the cooling capacity of refrigerating machine increases.

AIMS: This study aims to develop a series of 10 highly efficient high-head model centrifugal compressors with pressure ratio Πc=2.0.

MATERIALS AND METHODS: A complex calculation technique developed by the authors is used to increase the efficiency of centrifugal-compressor stages. The method consists of sequential execution of four stages: gas-dynamic calculation, profiling, three-dimensional viscous calculation, and multiparametric optimization.

RESULTS: A series of model centrifugal compressors has been designed with the following range-of-design-mode parameters: conditional flow coefficient is 0,035<Φ<0,12; theoretical head coefficient ψt.d.=0,74; and conditional Mach number is 0,93<Mu<0,96. The estimated isentropic efficiency of the developed centrifugal compressors ranges from 77% to 84% depending on the flow rate of the stage.

CONCLUSIONS: A series of 10 highly efficient centrifugal-compressor flow parts has been developed, which can be used in modern centrifugal-compressor gas-dynamic projects.

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About the authors

Aleksei M. Danilishin

ITMO University

Email: Danilishin_am@mail.ru
ORCID iD: 0000-0002-1213-7114
SPIN-code: 1162-5118
Russian Federation, Saint Petersburg

Yuri V. Kozhukhov

ITMO University

Author for correspondence.
Email: kozhukhov_yv@mail.ru
ORCID iD: 0000-0001-7679-9419
SPIN-code: 5756-4994

Cand. Sci. (Tech.), Associate Professor

Russian Federation, Saint Petersburg

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Supplementary files

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2. Fig. 1. Scheme of the high-head centrifugal-compressor model stage for compressor series development.

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3. Fig. 2. Design scheme of high-efficiency centrifugal compressor stages according to a complex calculation method.

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4. Fig. 3. Distribution of relative velocity versus average height of the impeller blades at different values of calculated diffusivity.

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5. Fig. 4. Characteristics of the turbocooling machines centrifugal-compressor efficiency and theoretical head coefficients at different values of calculated diffusivity.

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6. Fig. 5. Gas-dynamic characteristics of the refrigerating machines single-stage model centrifugal-compressor series.

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7. Fig. 6. Gas-dynamic characteristics of the single-stage centrifugal-compressor series for the turboexpander units.

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