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<p>In this study, the cooling fluid is injected through lobe-shaped holes (lobed jet) located on the suction surface of the blade. The novel design (lobed jet) and the baseline case are evaluated for five blowing ratios (0.3, 0.5, 0.7, 1.0 and 1.5). The commercial software ANSYS-CFX is used to analyze the numerical results as the laterally averaged film cooling, discharge coefficient and the Area weighted average film cooling effectiveness. By examining the velocity vectors and contours across the blade surface, the thermal flow behavior is described and comprehended. The turbulence model SSG-RSM model is chosen as the closure model. The result of this investigation pointed out that the proposed injection holes enhance the film cooling performance especially at higher blowing ratios. In addition, the creation of the kidney vortices is found to have less impact in the new cases compared with the basic hole case. Lobed jets demonstrated a significant increase in film cooling efficiency, especially at higher blowing ratios, where flow adherence was notably better than that from round holes.</p>

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The lobe-shaped hole effect on film cooling efficiency on suction side of turbine blade

  • 期刊论文

  • 发表日期：

    2025年5月1日

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  • K. Boualem,
  • F. Ben Ali Kouchih,
  • F. Nemdili,
  • M. Bourdim,
  • A. Azzi

摘要

In this study, the cooling fluid is injected through lobe-shaped holes (lobed jet) located on the suction surface of the blade. The novel design (lobed jet) and the baseline case are evaluated for five blowing ratios (0.3, 0.5, 0.7, 1.0 and 1.5). The commercial software ANSYS-CFX is used to analyze the numerical results as the laterally averaged film cooling, discharge coefficient and the Area weighted average film cooling effectiveness. By examining the velocity vectors and contours across the blade surface, the thermal flow behavior is described and comprehended. The turbulence model SSG-RSM model is chosen as the closure model. The result of this investigation pointed out that the proposed injection holes enhance the film cooling performance especially at higher blowing ratios. In addition, the creation of the kidney vortices is found to have less impact in the new cases compared with the basic hole case. Lobed jets demonstrated a significant increase in film cooling efficiency, especially at higher blowing ratios, where flow adherence was notably better than that from round holes.