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Investigation of the comprehensive performance of turbine stator cascades with heating endwall fences

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  • Han, Xu
  • Zeng, Wei
  • Han, Zhonghe

Abstract

The study of wet steam two-phase flow is particularly important for the improvement of steam turbine efficiency and optimization of the design of a cascade channel. For White cascade, an endwall fence was designed and heated in the cascade. Eulerian-Eulerian model based on the finite volume method was imposed to analyze the aerodynamic performance, dehumidification performance, entropy production and enthalpy drop of the cascade for different positions and heating strengths of the endwall fence. The analysis indicated that the dehumidification performance can be improved by installing the endwall fence close to the cascade outlet but that doing so slightly deteriorates the aerodynamic performance. Moreover, higher heating intensity is costlier while providing a decreasing benefit; thus, it is necessary to select reasonable heating intensity. By comparison, an optimum design scheme is obtained that can improve the stage efficiency, operational safety and overall work capacity of the unit while reducing the energy loss. Moreover, compared with the original case, the average outlet wetness, total pressure loss and entropy production of the cascade can be lessened by 43.4%, 2.0% and 2.0%, respectively, while the enthalpy drop is raised by approximately 3.9%. These research results can serve as a reference for turbine passage design.

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  • Han, Xu & Zeng, Wei & Han, Zhonghe, 2019. "Investigation of the comprehensive performance of turbine stator cascades with heating endwall fences," Energy, Elsevier, vol. 174(C), pages 1188-1199.
    • Handle: RePEc:eee:energy:v:174:y:2019:i:c:p:1188-1199
    DOI: 10.1016/j.energy.2019.03.038
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    References listed on IDEAS

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    1. Zhonghe Han & Wei Zeng & Xu Han & Peng Xiang, 2018. "Investigating the Dehumidification Characteristics of Turbine Stator Cascades with Parallel Channels," Energies, MDPI, vol. 11(9), pages 1-17, September.
    2. Xu Han & Zhonghe Han & Wei Zeng & Jiangbo Qian & Zhi Wang, 2017. "Coupled Model of Heat and Mass Balance for Droplet Growth in Wet Steam Non-Equilibrium Homogeneous Condensation Flow," Energies, MDPI, vol. 10(12), pages 1-12, December.
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    5. Mirhoseini, Mohadeseh Sadat & Boroomand, Masoud, 2017. "Multi-objective optimization of hot steam injection variables to control wetness parameters of steam flow within nozzles," Energy, Elsevier, vol. 141(C), pages 1027-1037.
    6. Vatanmakan, Masoud & Lakzian, Esmail & Mahpeykar, Mohammad Reza, 2018. "Investigating the entropy generation in condensing steam flow in turbine blades with volumetric heating," Energy, Elsevier, vol. 147(C), pages 701-714.
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