Abstract
The dynamics of passively controlled turbulent flow around different bluff-bodies used in the injection system of a combustion chamber is studied using large-eddy simulation (LES). The influence of three bluff-body geometries (cylindrical, square, star) is analyzed using an in-house high-order academic code. The inlet boundary conditions are generated separately using the ANSYS Fluent software in a precursor simulation. The paper focuses on the structure of the wake, the size and shape of turbulent vortices, the size and location of the recirculation zones and the impact of these parameters on a passive scalar mixing. The performed simulations allow identification of large vortical structures formed downstream the bluff-bodies. Their topology and dynamics strongly depend on the bluff-bodies shape but the mixing intensity is not necessarily amplified when non-circular bluff-bodies are used. In the presence of sharp corners (square and star bluff-body) the small-scale vortices generated in their vicinity cause a deformation of large vortical structures and this effect leads to a less intense entrainment of the flow to the recirculation region.
| Original language | English |
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| Publication status | Published - 2022 |
| Event | 12th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2022 - Osaka, Virtual, Japan Duration: 19 Jul 2022 → 22 Jul 2022 Conference number: 12 |
Conference
| Conference | 12th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2022 |
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| Abbreviated title | TSFP 2022 |
| Country/Territory | Japan |
| City | Osaka, Virtual |
| Period | 19/07/22 → 22/07/22 |