Numerical analysis shows enhanced film cooling efficiency in flat plates with modified hole geometries, implying design advancements for cooling applications.
This study investigates the influence of Wave Fan Shape Holes(WFSH) on adiabatic film cooling effectiveness for flat plate configurations. Five configurations were analyzed: a baseline cylindrical hole and four modified geometries, FSH and WFSH-1 to WFSH-3. The Reynolds averaged Navier-Stokes approach with the RNG k–ε turbulence model were used to simulate the fifteen cases, corresponding to three blowing ratios (M = 0.5, 1.0, and 1.5). First, to validate the numerical model, satisfactory agreement between the experimental measurements of the baseline case and the CFD results was verified. Next, Area-weighted film cooling efficiencies and discharge coefficients were evaluated, as well as mean efficiency distributions along the centerline and lateral lines. Results indicate that all fan shape holes, whether with wave-shaped geometries or not, significantly improve film-cooling performance compared to the baseline, especially at higher blowing ratios exceeding 100%. However, the tested design of WFSH-2 consistently exhibited superior cooling effectiveness, maintaining better jet attachment and surface coverage. Although these modifications resulted in a moderate decrease in the discharge coefficient, up to 57%.
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Sadia et al. (2026) studied this question.
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