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http://dx.doi.org/10.5293/kfma.2017.20.2.005

Improvement of Film Cooling Performance of a Slot on a Flat Plate Using Coanda Effect  

Kim, Gi Mun (School of Aerospace and Mechanical Engineering, Korea Aerospace University)
Kim, Ye Jee (School of Aerospace and Mechanical Engineering, Korea Aerospace University)
Kwak, Jae Su (School of Aerospace and Mechanical Engineering, Korea Aerospace University)
Publication Information
The KSFM Journal of Fluid Machinery / v.20, no.2, 2017 , pp. 5-10 More about this Journal
Abstract
In this study, the Coanda effect inducing bump was applied to improve the film cooling effectiveness on the flat plate with $30^{\circ}$ and $45^{\circ}$ angled rectangular slots. The slot length to width ratio was 6. A cylindrical cap shaped structure, called Coanda bump, was installed at the exit of the slot to generate Coanda effect. The width and height of the bump was 10.5 mm and 1 mm, respectively. The film cooling effectiveness was measured at the fixed blowing ratio, M=2.0, using pressure sensitive paint (PSP) technique. The mainstream velocity was 10 m/s and the turbulence intensity was about 0.5%. Results showed that the film cooling effectiveness for case of $30^{\circ}$ angled slot was higher than that of $45^{\circ}$ angled slot. It was found that there was no positive effect of Coanda effect on the overall averaged film cooling effectiveness for the $30^{\circ}$ angled slot. On the other hand, for the $45^{\circ}$ angled slot, the film cooling effectiveness was improved with the installation of the Coanda bump.
Keywords
Gas Turbine; Flim Cooling; Coanda Effect; Pressure Sensitive Paint;
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