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Adaptability of subregional film cooling under subsonic off-design conditions

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  • Wang, Chenfeng
  • Li, Guoqing
  • Liu, Kaiyang
  • Wang, Desen
  • Lu, Xingen

Abstract

In order to meet the needs of the next generation of variable cycle engine, the adaptability of subregional film cooling is studied applying an off-design subsonic experiment as the main approach with relative numerical supplement. A subsonic linear cascade wind tunnel with heated mainstream is employed to investigate an incidence range from extreme negative incidence i = −29.5° to extreme positive incidence i = +29.5°. Subregional strategy is validated with cooling performance improved by up to 25.7 % and losses reduced by up to 3.7 %. According to the results especially at off-design incidences, a cooling boundary of incidence range is found. The valid incidence range for subregional strategy on pressure surface is from −14.5° to +29.5° and that on suction surface is from −29.5° to +14.5°, in which the cooling performance is better with coverage improvement of subregional strategy. The losses at i = +29.5° are measured at 8.2 to 10.0 times those observed under design conditions. In simulation supplement, the development of passage vortex is suppressed while backflow vortex is obvious at i = +29.5°. Euler number is successfully implemented to assess film detachment and backflow phenomena under extreme conditions. The findings establish a fundamental database for subsonic film cooling performance and experimentally prove the advantage of subregional strategy. The investigation gives insights for aero-engine thermal management and future turbomachinery cooling designs under off-design conditions.

Suggested Citation

  • Wang, Chenfeng & Li, Guoqing & Liu, Kaiyang & Wang, Desen & Lu, Xingen, 2026. "Adaptability of subregional film cooling under subsonic off-design conditions," Energy, Elsevier, vol. 342(C).
    • Handle: RePEc:eee:energy:v:342:y:2026:i:c:s0360544225054301
    DOI: 10.1016/j.energy.2025.139787
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    References listed on IDEAS

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