Impact of inflow turbulence on large-eddy simulation of film cooling flows
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 enhance- ment 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 turbu- lence being a complex subject and problem-dependent, the importance of introducing realistic turbulent inflow in LES of cooling flows is demonstrated.
- Aeronautical, Automotive, Chemical and Materials Engineering
- Aeronautical and Automotive Engineering
Published inInternational Journal of Heat and Mass Transfer
- VoR (Version of Record)
Rights holder© The Author(s)
Publisher statementThis is an Open Access Article. It is published by Elsevier under the Creative Commons Attribution 4.0 International Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/