Impact of inflow turbulence on large‐eddy simulation of film cooling flows

Ellis, C.D.; Xia, H.

Abstract

The paper investigates the impact of industrially appropriate inflow turbulence on the turbulent state, mixing capability and surface coolant distribution of film cooling flow using LES. Near-wall and freestream turbulence, corresponding to turbulent boundary layers and stochastic turbulent fluctuations away from the wall, have been investigated. In our study, we set up three main test scenarios: no inflow turbulence, near-wall boundary layer turbulence and freestream turbulence. Our work shows that surface adiabatic cooling effectiveness differs significantly with and without inflow turbulence. It is also evident that freestream turbulence enhances the mixing ability of a cooling flow, providing an initial enhancement of surface cooling close to the hole but with reduced cooling effectiveness downstream. Turbulent length scales, turbulent heat flux and turbulent anisotropy are compared and illustrate the changes in cooling effectiveness as a result of the upstream turbulent behaviour. As a result, despite inflow turbulence being a complex subject and problem-dependent, the importance of introducing realistic turbulent inflow in LES of cooling flows is demonstrated.

Citation

Ellis, C., & Xia, H. (2022). Impact of inflow turbulence on large‐eddy simulation of film cooling flows. International Journal of Heat and Mass Transfer, 195, Article 123172. https://doi.org/10.1016/j.ijheatmasstransfer.2022.123172

• Journal Article Type: Article
• Acceptance Date: Jun 17, 2022
• Online Publication Date: Jun 30, 2022
• Publication Date: 2022-10
• Deposit Date: Sep 16, 2024
• Publicly Available Date: Oct 3, 2024
• Journal: International Journal of Heat and Mass Transfer
• Print ISSN: 0017-9310
• Electronic ISSN: 0017-9310
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 195
• Article Number: 123172
• DOI: https://doi.org/10.1016/j.ijheatmasstransfer.2022.123172
• Public URL: https://nottingham-repository.worktribe.com/output/34871550
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S0017931022006421?via%3Dihub