Numerical investigation of V-shaped trench on film cooling performance
Kh. Boualem1, M. Bordjane2, M. Bourdim1, M. Grine3, A. Azzi2
1Ahmed Zabana University of Relizane, Relizane, Algeria
2Mohamed Boudiaf University of Sciences and Technologies Oran, Oran, Algeria
3Mohamed Ben Ahmed University Oran 2, Oran, Algeria
Keywords: film cooling efficiency, V-shaped trench, total pressure loss
Abstract
This study seeks to improve the film cooling performance by embedding a film hole in a V-shaped trench. The angle scale that makes up the V has been changed, 25°, 75° and 115°. The three novel designs were compared to rectangular (transverse) trench and conventional cylindrical hole. The main parameters of film cooling, cooling effectiveness, and total pressure loss, were discussed at three blowing ratios, M=0.5, 1.0, and 2.0. Fifteen cases were simulated using Reynolds averaged Navier-Stokes equations closed by the RNG k-ε model. A good agreement is obtained between CFD results with experimental data of the baseline case. The results showed that the use of compact jet in the trenches, whether transverse or V-shaped, enhances the film cooling effectiveness. The use of V-shaped trench helps to reduce the size of the kidney vortices (CRV) and, thus, enhance the film cooling performance. The V2 shaped trench is the most prefer in improving the film cooling efficiency and reducing the total pressure loss.
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