Optimization of geometric parameters of cylindrical film cooling hole with contoured craters to enhance film-cooling effectiveness

Bai, Linchao; Zhang, Chao; Tong, Zhiting; Ju, Pengfei

doi:10.1134/s0869864321060081

Cited by 6 publications

(2 citation statements)

References 13 publications

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“…At the blowing ratio M=1.0, the arc and triangle protrusion cratered holes represent similar streamwise vorticity structures and intensities, including three vortex pairs. The flow field with three vortex pairs is different from that with two vortex pairs in [24][25][26], mainly attributed to a larger lateral span of 6D in the current study. The middle one is the original kidney-shaped vortex pair, commonly regarded as the origin of the coolant lift-off.…”

Section: Flow Fieldcontrasting

confidence: 84%

“…Fu et al [25] emphasized the influence of the crater depth on the flow field and cooling effectiveness for the contoured cratered hole. Bai et al [26] further performed the optimization shape design of the contoured cratered design at two blowing ratios of 0.5 and 1.5. It was shown that an appropriate combination of the geometrical parameters could improve 17.21% at a blowing ratio of 0.5 and 101.96% at a blowing ratio of 1.5, compared with the reference model.…”

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: Flow Fieldcontrasting

confidence: 84%

Section: Introductionmentioning

confidence: 99%