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<p>To evaluate the film cooling performance and underlying flow mechanisms of laidback fan-shaped film holes with an internal cooling channel equipped with distinct V-shaped ribs under the blowing ratios range from 0.5 to 2.0, three rib configurations are considered: smooth channel, continuous V-shaped ribs, and truncated V-shaped ribs. The case with truncated V-shaped ribs performs best on improving film cooling performance at lower blowing ratios, while the case with continuous V-shaped ribs outperforms at higher blowing ratios. The flow mechanism analysis indicates that the rib-induced vortices intensity and distributions, the helical flow intensity inside the film hole and the counter-rotating vortex pair distribution located in the downstream region dominate the film cooling efficiency through different mechanisms. The comparative benefits across various blowing ratios are analyzed according to these key mechanisms.</p>

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Comparative investigation of the effects of V-shaped rib configurations on the film cooling performance of laidback fan-shaped holes

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • X. Zhang,
  • Y. Pei,
  • H. Luo,
  • K. Ma

摘要

To evaluate the film cooling performance and underlying flow mechanisms of laidback fan-shaped film holes with an internal cooling channel equipped with distinct V-shaped ribs under the blowing ratios range from 0.5 to 2.0, three rib configurations are considered: smooth channel, continuous V-shaped ribs, and truncated V-shaped ribs. The case with truncated V-shaped ribs performs best on improving film cooling performance at lower blowing ratios, while the case with continuous V-shaped ribs outperforms at higher blowing ratios. The flow mechanism analysis indicates that the rib-induced vortices intensity and distributions, the helical flow intensity inside the film hole and the counter-rotating vortex pair distribution located in the downstream region dominate the film cooling efficiency through different mechanisms. The comparative benefits across various blowing ratios are analyzed according to these key mechanisms.