Abstract
In the present work, computational simulations was made using ANSYS CFX to predict the improvements in film cooling performance with dual trench. Dual-trench configuration consists of two trenches together, one wider trench and the other is narrow trench that extruded from the wider one. Several blowing ratios in the range (0.5:5) were investigated. The pitch-to-diameter ratio of 2.775 is used. By using the dual trench configuration, the coolant jet impacted the trench wall two times allowing increasing the spreading of coolant laterally in the trench, reducing jet velocity and jet completely covered on the surface. The results indicate that this configuration increased adiabatic effectiveness as blowing ratio increased. The spatially averaged adiabatic effectiveness reached 57.6% for at M= 2. No observed film blow-off at all blowing ratios. The adiabatic film effectiveness of dual trench case outperformed the narrow trench case, laidback fan-shaped hole, fan-shaped hole and cylinder hole at different blowing ratios.
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Foundation item: Supprted by Harbin Engineering University Scholarship under Grant No. 20100903D01.
Antar M.M. Abdala is Ph.D candidate in Power and Energy Engineering College, Harbin Engineering University. His major research area is heat transfer applications and gas turbines blades cooling.
Qun Zheng is Professor in Power and Energy Engineering College, Harbin Engineering University, China. His major research area is Performance and system analysis for ship power plant totality.
Ping Dong is Associated preofessor in Power and Energy Engineering College, Harbin Engineering University, China. His main research interest is aerodynamics.
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Abdala, A.M.M., Zheng, Q., Elwekeel, F.N.M. et al. Computational film cooling effectiveness of dual trench configuration on flat plate at moderate blowing ratios. J. Marine. Sci. Appl. 12, 208–218 (2013). https://doi.org/10.1007/s11804-013-1187-9
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DOI: https://doi.org/10.1007/s11804-013-1187-9