Abstract
In the present work, a wall-resolved large-eddy simulation (WRLES) study of a gas turbine shaped-hole film cooling configuration is conducted, with a focus on the effects of in-hole surface roughness. The WRLES model is developed using a high-order spectral element method (SEM) flow solver, NekRS. The baseline configuration corresponds to blowing ratio of 1.5, density ratio of 1.5, and hole inclination angle of 30 degrees relative to the direction of mainstream flow. In-hole surface roughness is modeled using uniformly distributed truncated cone elements. The computational fluid dynamics (CFD) model is validated against available experimental data for "smooth", "slightly rough", and "rough" hole, demonstrating good agreement with respect to velocity profiles (for the "smooth" hole case) and thermal effectiveness (for both "smooth" and "slightly rough" hole cases). We investigate the effect of each parameter of the truncated cone, including height, width, and angle, on the performance of shaped-hole film cooling. The results indicate that in-hole roughness negatively impacts the performance of film cooling. Moreover, it is observed that the height of the truncated cones has a greater impact on cooling effectiveness compared to the cone angle. Additionally, increasing the length of the roughness unit, while keeping the other parameters constant, significantly increases the thermal cooling effectiveness.
| Original language | English |
|---|---|
| Title of host publication | AIAA Aviation Forum and ASCEND, 2024 |
| Publisher | American Institute of Aeronautics and Astronautics Inc, AIAA |
| ISBN (Print) | 9781624107160 |
| DOIs | |
| State | Published - 2024 |
| Externally published | Yes |
| Event | AIAA Aviation Forum and ASCEND, 2024 - Las Vegas, United States Duration: Jul 29 2024 → Aug 2 2024 |
Publication series
| Name | AIAA Aviation Forum and ASCEND, 2024 |
|---|
Conference
| Conference | AIAA Aviation Forum and ASCEND, 2024 |
|---|---|
| Country/Territory | United States |
| City | Las Vegas |
| Period | 07/29/24 → 08/2/24 |
Funding
The submitted manuscript has been created by UChicago Argonne, LLC, Operator of Argonne National Laboratory (Argonne). Argonne, a U.S. Department of Energy Office of Science laboratory, is operated under Contract No. DEAC02-06CH11357. The U.S. Government retains for itself, and others acting on its behalf, a paid-up nonexclusive, irrevocable worldwide license in said article to reproduce, prepare derivative works, distribute copies to the public, and perform publicly and display publicly, by or on behalf of the Government. The research work was funded by the DOE Advanced Manufacturing Office (AMO) through the High Performance Computing for Energy Innovation (HPC4EI) program. The authors thank Dr. Robert Shroeder from Sargent and Lundy and Prof. Karen Thole from Pennsylvania State University for sharing the CAD file of the 7-7-7 shaped hole configuration. This research used resources of the Oak Ridge Leadership Computing Facility (OLCF) at the Oak Ridge National Laboratory (ORNL), which is supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC05-00OR22725. The authors also used resources of the Argonne Leadership Computing Facility, a U.S. Department of Energy (DOE) Office of Science user facility at Argonne National Laboratory which is supported by the U.S. DOE Office of Science-Advanced Scientific Computing Research Program, under Contract No. DE-AC02-06CH11357.