Experimental and Numerical Analysis of the Impeller Backside Cavity in a Centrifugal Compressor for CAES

Zhihua Lin, Zhitao Zuo, Wei Li, Jianting Sun, Xin Zhou, Haisheng Chen and Xuezhi Zhou
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Zhihua Lin: Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
Zhitao Zuo: Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
Wei Li: Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
Jianting Sun: Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
Xin Zhou: Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
Haisheng Chen: Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
Xuezhi Zhou: National Energy Large Scale Physical Energy Storage Technologies R&D Center of Bijie High-Tech Industrial Development Zone, Bijie 551712, China

Energies, 2022, vol. 15, issue 2, 1-18

Abstract: Relying on a closed test rig of a high-power intercooling centrifugal compressor for compressed air energy storage (CAES), this study measured the static pressure and static temperature at different radii on the static wall of the impeller backside cavity (IBC) under variable rotating speeds. Simultaneously, the coupled computations of all mainstream domains with IBC or not were used for comparative analysis of the aerodynamic performances of the compressor and the internal flow field in IBC. The results show that IBC has a significant impact on coupling characteristics including pressure ratio, efficiency, torque, shaft power, and axial thrust of the centrifugal compressor. The gradients of radial static pressure and static temperature in IBC both increase with the decrease of mainstream flow or the increase of rotating speed, whose distributions are different under variable rotating speeds due to the change of the aerodynamic parameters of mainstream.

Keywords: centrifugal compressor; impeller backside cavity; variable rotating speeds; coupling characteristics (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: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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