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Improving cooling performance and robustness of NGV endwall film cooling design using micro-scale ribs considering incidence effects

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  • Wang, Zhiduo
  • Feng, Zhenping
  • Zhang, Xiaobo
  • Peng, Jingbo
  • Zhang, Fei
  • Wu, Xing

Abstract

Modern lean-burn combustors generate aggressive swirling flow at the entrance of high-pressure turbine nozzle guide vane (NGV), and lead to cooling performance deterioration of the NGV film cooling system. Improving the cooling performance of NGV becomes a delicate task for the designers. In this study, micro-scale ribs with novel arrangement method were applied to improve the cooling effectiveness and robustness of NGV endwall cooling system at varying incidence conditions. Numerical simulations were employed to perform comprehensive studies on film cooling performance of smooth and ribbed endwall with double-row staggered film holes. Three incidence angles −30°, 0° and 30° were specified. Endwall adiabatic film cooling efficiency, heat transfer coefficient, net heat flux reduction (NHFR) and flow field structures were analyzed. The results indicated that the designed ribs weaken the intensity of the horse shoe vortex and passage vortex effectively. Coupled with the suppression of cross migration of coolant and weakening of heat transfer intensity, endwall cooling performance is thoroughly improved. Area-averaged film cooling efficiency and NHFR are increased by 46.33% and 108.43%, respectively, in the 30° incidence condition. In addition, the discrepancies of film cooling performance at different incidence conditions are attenuated, and the robustness of endwall cooling design is improved.

Suggested Citation

  • Wang, Zhiduo & Feng, Zhenping & Zhang, Xiaobo & Peng, Jingbo & Zhang, Fei & Wu, Xing, 2022. "Improving cooling performance and robustness of NGV endwall film cooling design using micro-scale ribs considering incidence effects," Energy, Elsevier, vol. 253(C).
    • Handle: RePEc:eee:energy:v:253:y:2022:i:c:s0360544222011069
    DOI: 10.1016/j.energy.2022.124203
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    References listed on IDEAS

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    1. 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.
    2. Kadhim, Hakim T. & Rona, Aldo, 2018. "Design optimization workflow and performance analysis for contoured endwalls of axial turbines," Energy, Elsevier, vol. 149(C), pages 875-889.
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    Cited by:

    1. Li, Haiwang & Wang, Meng & You, Ruquan & Liu, Song, 2023. "Thermal radiation correction formula of the scaling criteria for film cooling of turbine blades," Energy, Elsevier, vol. 282(C).
    2. Zhang, Yueliang & Li, Jiangheng & Xie, Jin, 2022. "Effects of lateral cooling hole configuration on a swirl-stabilized combustor," Energy, Elsevier, vol. 259(C).

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