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http://dx.doi.org/10.5293/kfma.2014.17.3.059

A Study on the Film-cooling Characteristics of Gas Turbine Blade with Various Area Ratios and Ejection Angles of the Double Jet Holes  

Cho, Moon-Young (Graduate School of Mechanical Engineering, Sungkyunkwan University)
Lee, Jong-Chul (School of Mechanical and Automotive Engineering, Gangneung-Wonju National University)
Kim, Youn-Jea (School of Mechanical Engineering, Sungkyunkwan University)
Publication Information
The KSFM Journal of Fluid Machinery / v.17, no.3, 2014 , pp. 59-64 More about this Journal
Abstract
The kidney vortex is the important factor adversely influencing film cooling effectiveness. In general, double jet film-cooling hole is designed to overcome the kidney vortex by generating anti-kidney vortices. In this study, the film cooling characteristics and the effectiveness of the double jet film cooling hole were numerically investigated with various area ratios of the first($A_1$) and second($A_2$) cooling hole($A_1/A_2$=0.8, 1.0, 1.25) and lateral ejection angle(${\alpha}$ = $30^{\circ}$, $45^{\circ}$, $60^{\circ}$) as the design parameters. The effects of lateral distance between the first and second row holes are investigated. Numerical study was performed by using ANSYS CFX with the shear stress transport(SST) turbulence model. The film cooling effectiveness and temperature distribution were graphically depicted with various flow and geometrical conditions.
Keywords
Film-cooling effectiveness; Kidney vortex; Double jet film-cooling hole; Ejection angle;
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