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Design of a partial discharge shrouded impeller for the centrifugal compressor of supercritical carbon dioxide power cycles

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  • Yang, Zimu
  • Jiang, Hongsheng
  • Zhuge, Weilin
  • Qian, Yuping
  • Zhang, Yangjun

Abstract

In this paper, the concept of partial discharge shrouded impeller is proposed to enhance the performance of supercritical carbon dioxide (S-CO2) centrifugal compressor under low flow rates, thereby increasing the overall efficiency of the S-CO2 Brayton cycle. The influence mechanism of the partial discharge shrouded impeller on the flow behavior inside the impeller domain has been revealed by computational fluid dynamics (CFD) simulation. The results indicate a notable enhancement in the pressure ratio and isentropic efficiency of the S-CO2 centrifugal compressor utilizing the best partial discharge shrouded impeller, showcasing improvements of 0.9% and 10.2% respectively under designed flow rate condition, while the stability parameter (SP) surpasses 0 at lower flow rates when compared to conventional impeller. With the partial discharge shrouded impeller, the flow separation on the blade pressure surface tends to occur nearer the impeller outlet, restricting the wake secondary flow shedding off to the diffuser, thus the flow loss being weakened. Meanwhile, with the optimized compressor by employing the best partial discharge shrouded impeller, the efficiency of S-CO2 Brayton cycle has been increased by 5% relative to that with full discharge shrouded impeller.

Suggested Citation

  • Yang, Zimu & Jiang, Hongsheng & Zhuge, Weilin & Qian, Yuping & Zhang, Yangjun, 2024. "Design of a partial discharge shrouded impeller for the centrifugal compressor of supercritical carbon dioxide power cycles," Energy, Elsevier, vol. 307(C).
    • Handle: RePEc:eee:energy:v:307:y:2024:i:c:s0360544224024873
    DOI: 10.1016/j.energy.2024.132713
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