THERMAL SCIENCE

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Authors of this Paper

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Wenzhuang Wang

,

Chao Zhang

,

Zhiting Tong

EFFECT OF PROTRUSION SHAPE ON FILM COOLING PERFORMANCE FOR THE CYLINDRICAL HOLE EMBEDDED IN A CONTOURED CRATER

ABSTRACT
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.
KEYWORDS
film cooling, Cratered hole, Protrusion shape, cooling effectiveness, Aerodynamic loss, numerical simulation
PAPER SUBMITTED: 2022-04-15
PAPER REVISED: 2022-07-02
PAPER ACCEPTED: 2022-08-01
PUBLISHED ONLINE: 2022-09-10
DOI REFERENCE: https://doi.org/10.2298/TSCI220415126W
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2023, VOLUME 27, ISSUE Issue 1, PAGES [245 - 260]
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Effect of protrusion shape on film cooling performance for the cylindrical hole embedded in a contoured crater

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence