Mechanical Engineering Science

Influence of Different Equations of State on Simulation Results of Supercritical CO2 Centrifugal Compressor

YANGYueming, MABingkun, XIAOYongqing, QIJianhui


Supercritical CO2 (SCO2) Brayton cycle has received more and more attention in the field of power generation due to its high cycle efficiency and compact structure. SCO2 compressor is the core component of the cycle, and the improvement of its performance is the key to improving the efficiency of the entire cycle. However, the operation of the SCO2 compressor near the critical point has brought many design and operation problems. Based on the Reynolds Averaged Navier-Stokes (RANS) model, the performance and flow field of SCO2 centrifugal compressors based on different CO2 working fluid models are numerically investigated in this paper. The stability and convergence of the compressor steady-state simulation are also discussed. The results show that the fluid based on the Span-Wanger (SW) equation can obtain a more ideal compressor performance curve and capture a more accurate flow field structure, while the CO2 ideal gas is not suitable for the calculation of SCO2 centrifugal compressors. But its flow field can be used as the initial flow field for numerical calculation of centrifugal compressor based on CO2 real gas.


Supercritical CO2; Centrifugal compressor; Near the critical point; Compressor performance; Real gas equation of state

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