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Definition of cycle based comprehensive efficiency of a cooled turbine

Author

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  • Ba, Wei
  • Wang, Xiao-chen
  • Li, Xue-song
  • Ren, Xiao-dong
  • Gu, Chun-wei

Abstract

As known that the cooling technology is commonly used in the turbine to protect the turbine blade. The mixing and heat transfer between the high pressure cooling air from the compressor and the turbine main flow would cause energy loss, and it will influence the gas turbine cycle performance. However, the existing definitions of the cooled turbine efficiency always take no account of the work which is added to the cooling air to product high pressure in the compressor, thus, the cooling influence on the gas turbine cycle performance cannot be indicated by using the existing cooled turbine efficiency. In this paper, a definition of cycle based comprehensive efficiency for a cooled turbine is presented, in which the work added to the cooling air during its compression process is considered. The existing efficiency definitions are first reviewed, then, the definition of the cooled turbine comprehensive efficiency is presented and validated numerically to show its capacity. Finally, the redesign of a high-pressure turbine is provided. The result shows that the new efficiency can evaluate a cooled turbine performance comprehensively, and can be used as a reliable evaluation criterion for the optimal design of a turbine or a gas turbine cycle.

Suggested Citation

  • Ba, Wei & Wang, Xiao-chen & Li, Xue-song & Ren, Xiao-dong & Gu, Chun-wei, 2019. "Definition of cycle based comprehensive efficiency of a cooled turbine," Energy, Elsevier, vol. 168(C), pages 601-608.
    • Handle: RePEc:eee:energy:v:168:y:2019:i:c:p:601-608
    DOI: 10.1016/j.energy.2018.11.137
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    References listed on IDEAS

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    1. Kvamsdal, Hanne M. & Jordal, Kristin & Bolland, Olav, 2007. "A quantitative comparison of gas turbine cycles with CO2 capture," Energy, Elsevier, vol. 32(1), pages 10-24.
    2. Marelli, Silvia & Capobianco, Massimo, 2011. "Steady and pulsating flow efficiency of a waste-gated turbocharger radial flow turbine for automotive application," Energy, Elsevier, vol. 36(1), pages 459-465.
    3. Song, Yin & Gu, Chun-wei & Ji, Xing-xing, 2015. "Development and validation of a full-range performance analysis model for a three-spool gas turbine with turbine cooling," Energy, Elsevier, vol. 89(C), pages 545-557.
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