| Citation: | XU Pengcheng, ZOU Zhengping, FU Chao, et al. Study of real-gas effects on aerodynamic performance of SCO2 centrifugal compressors[J]. Journal of Aerospace Power, 2025, 40（5）：20230498 doi: 10.13224/j.cnki.jasp.20230498
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By utilizing similitude theory and numerical simulation, the coupling effects of real-gas aerodynamics and thermophysical properties on the performance of compressors were decoupled. The characteristics and internal flow fields of a supercritical carbon dioxide centrifugal compressor were investigated under different inlet conditions, and the real-gas effects on the enthalpy increase, efficiency, and choke margin of the compressor were explored. The results showed that real-gas effects on the compressor performance can be divided into two categories: thermodynamic effects inherent in the thermodynamic definitions of the performance parameters and aerodynamic effects within the compressor's internal flow field. Among them, aerodynamic effects played a dominant role. By leveraging similitude parameters, the thermodynamic effects can be eliminated. When the real-gas effects were intensified, the reduction in fluid compressibility decreased the impeller’s Euler work, leading to a reduction in enthalpy increase. The alleviation of the blade loading reduced load-related aerodynamic losses, thereby improving the efficiency. The presence of two-phase flow and the onset of choking at the throat led to the reduction of choke margin.
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