Skip to main content

Research Repository

Advanced Search

Computational study of hole shape effect on film cooling performance

Yao, Jun; Yao, Yufeng

Authors

Dr Jun Yao Jun.Yao@uwe.ac.uk
Senior Lecturer Aerospace Themofluids

Yufeng Yao Yufeng.Yao@uwe.ac.uk
Professor in Aerospace Engineering



Abstract

Film cooling effectiveness has been studied by using a computational approach based on solving the Reynolds-averaged Navier-Stokes equations. A wind tunnel test configuration is considered with a total of four cooling hole geometries as a cylindrical hole, a cylindrical hole with an upstream wedge (called 'ramp' thereafter), a shaped diffuser, and a double console slot. In all cases, the hole centreline has an inclination angle of 35° against the mainstream airflow and the blowing ratio is unity. Choosing the cylindrical model as a baseline, simulations have been carried out for grid convergence and turbulence model influence studies. Results are compared with available experimental data and other numerical predictions and good agreement has been achieved. Further computations continue with three remaining geometries, using the baseline flow conditions and configuration. Comparing to the results from the baseline model, it was found that the centreline adiabatic cooling effectiveness has shown incremental increases for the 'ramp' model, while results from the console slot model and the shape diffuser model have exhibited significant improvements by a factor of 1.5 and 2, respectively. The reason for such a step change in cooling effectiveness is mainly due to the weakening of the vortex structures in the vicinity of the hole exit, thus significantly reducing the entrainment of surrounding 'hot' fluids.

Citation

Yao, J., & Yao, Y. (2011). Computational study of hole shape effect on film cooling performance. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 225(4), 505-519. https://doi.org/10.1177/0957650911399013

Journal Article Type Conference Paper
Publication Date Jun 1, 2011
Journal Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy
Print ISSN 0957-6509
Electronic ISSN 2041-2967
Publisher SAGE Publications
Peer Reviewed Not Peer Reviewed
Volume 225
Issue 4
Pages 505-519
DOI https://doi.org/10.1177/0957650911399013
Keywords cooling hole geometry, adiabatic cooling effectiveness
Public URL https://uwe-repository.worktribe.com/output/962290
Publisher URL http://dx.doi.org/10.1177/0957650911399013