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Aerodynamic analysis of a highly loaded compressor in semi‐closed cycles using a throughflow method

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  • Bo Li
  • Chun‐wei Gu
  • Yin Song

Abstract

This paper outlines the aerodynamic performance of a highly loaded 5‐stage compressor in a conceptual semi‐closed cycle. An in‐house throughflow computation procedure that has been proven to be a powerful tool in aerodynamic analysis for modern compressors is applied to simulate the compressor. The influences of changes in physical properties of the working medium with varying ratios of exhaust CO 2 recirculation are considered in the computation. A series of numerical simulations is conducted with two settings depending on whether the rotational speed is set to obey the criterion of similarity. For the identical non‐dimensional speed parameter, the compressor can operate stably with pure CO 2 as the working fluid. The distributions of aerodynamic parameters undergo no big differences under various CO 2 contents; however, a somewhat little higher loss is observed for the 5th stage. When the absolute rotational speed is set according to the originally designed value, the compressor can bear a 25% CO 2 content at the cost of a substantially narrowed working range, and a recirculation ratio of approximately 10% is a safe threshold value. The aerodynamic configuration also undergoes a notable redistribution given these circumstances; the load of the front stages is reduced, but the rear stages become the risk factors at near stall condition. This research reveals that from the compressor design point of view, a semi‐closed cycle is feasible using existing technology and that compressor modifications are needed according to situational requirements. © 2015 Society of Chemical Industry and John Wiley & Sons, Ltd

Suggested Citation

  • Bo Li & Chun‐wei Gu & Yin Song, 2015. "Aerodynamic analysis of a highly loaded compressor in semi‐closed cycles using a throughflow method," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 5(5), pages 545-557, October.
  • Handle: RePEc:wly:greenh:v:5:y:2015:i:5:p:545-557
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    File URL: http://hdl.handle.net/10.1002/ghg.1497
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    2. Davison, John, 2007. "Performance and costs of power plants with capture and storage of CO2," Energy, Elsevier, vol. 32(7), pages 1163-1176.
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