Numerical Modeling and Analysis of Grooved Surface Applied to Film Cooling

• Published in: Journal of bionics engineering Vol. 8; no. 4; pp. 464 - 473
• Main Authors: Guo, L., Liu, Z.C., Yan, Y.Y., Han, Z.W.
• Format: Journal Article
• Language: English
• Published: Singapore Elsevier Ltd 01.12.2011; Springer Singapore
• Subjects: Artificial Intelligence; Biochemical Engineering; Bioinformatics; Biomaterials; Biomedical Engineering and Bioengineering; Biomedical Engineering/Biotechnology; Blowing; blowing ratio; Coolants; Cooling; cooling effectiveness; Engineering; Film cooling; Fluent软件; Fluid flow; Grooved; grooved structure; Mathematical models; non-smooth surface; Turbulent flow; 分析应用; 数值模拟; 气膜冷却效率; 沟槽; 混合过程; 湍流闭合; 表面传热; cooling effectiveness; blowing ratio; grooved structure; film cooling; non-smooth surface
• ISSN: 1672-6529; 2543-2141
• DOI: 10.1016/S1672-6529(11)60052-8

In order to improve the efficiency of film cooling, numerical investigation was carried out to study the effects of different film-cooled plates on surface heat transfer. Both grooved and non-grooved surfaces were concerned. The modeling was per- formed using Fluent software with the adoption of Shear-Stress Transport （SST） k-ωmodel as the turbulence closure. The coolant was supplied by a single film cooling hole with an inclination angle of 30°. The Mach numbers for the coolant flow and the mainstream flow were fixed at 0 and 0.6, respectively. At three blowing ratios of 0.5, 1.0 and 1.5, the aerodynamic behaviour of the mixing process as well as the heat transfer performance of the film cooling were presented. The numerical results were validated using experimental data extracted from a benchmark test. Good agreements between numerical results and the ex- perimental data were observed. For the film cooling efficiency, it shows that both local and laterally averaged cooling effectiveness can be improved by the non-smooth surface at different blowing ratios. Using the grooved surface, the turbulence intensity upon the plate can be reduced notably, and the mixing between the two flows is weakened due to the reduced turbu lence level. The results indicate that the cooling effectiveness of film cooling can be enhanced by applying the grooved surface.