Application of cylindrical, triangular and hemispherical dimples in the film cooling technology

Халатов, А. А.; Panchenko, N. A.; Severin, S.D.

doi:10.1088/1742-6596/891/1/012145

Cited by 7 publications

(2 citation statements)

References 3 publications

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“…The cooling effectiveness improvement depends on the crater shape compared to the cylindrical hole. Khalatov et al [19] numerically compared the cooling performance among the circular, hemispherical, and triangular cratered holes and found that the triangular cratered hole shows the highest cooling effectiveness. Khalatov et al [20] further performed a comparison study for the triangular cratered hole, emphasizing the effect of the leading-edge shape.…”

Section: Introductionmentioning

confidence: 99%

“…The flow dynamics of the cylindrical hole embedded in the contoured crater were further analyzed using the large eddy simulation [22]. Note that all the cratered holes [18][19][20][21] were studied under the condition of a small lateral distance of 3D between two adjacent rows (D is the cylindrical hole diameter). An et al [23] proposed a novel contoured cratered hole design with a concavely curved protrusion and a larger streamwise diffusion.…”

Section: Introductionmentioning

confidence: 99%

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Effect of protrusion shape on film cooling performance for the cylindrical hole embedded in a contoured crater

2023

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The cratered film-cooling hole is regarded as one of the potential applications with high cooling performance and low cost. This study focuses on the influence of the protrusion shape for the contoured crater embedded in the cylindrical hole. Four protrusion shapes, i.e., arc, rectangle, trapezoid, and triangle, are considered. The cooling effectiveness, flow structure, and aerodynamic loss for the cratered holes at blowing ratios of 0.5-2.5 are obtained using the numerical method with the Shear Stress turbulence model. The numerical results indicate that the arc and triangle protrusion models provide better lateral coolant coverage and higher area-averaged cooling effectiveness at higher blowing ratios, attributed to the ascendant anti-kidney-shaped vortex pair. The rectangle protrusion model provides the lowest area-averaged cooling effectiveness because the kidney-shaped vortex pair dominates the downstream flow field. For the aerodynamic loss, the largest total pressure loss coefficient occurs for the rectangle protrusion model and nearly equivalent values for the other three protrusion models. The contoured cratered holes with arc and triangle protrusions are generally recommended.

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Section: Introductionmentioning

confidence: 99%