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- W4205677276 abstract "Hybrid Reynolds-Averaged Navier-Stokes and Large-Eddy Simulation results for combustion in a generic round supersonic combustor operating in dual-mode are used to investigate the influence of assumed periodicity on prediction of key quantities such as precom-bustion shock location and pressure rise. While assuming periodicity can greatly reduce the cost of such simulations, a thorough investigation into the consequences of this assumption has yet to be undertaken. The results from a full domain are compared to results to a half, quarter and eighth periodic domains. Results also use two chemistry models for combustion of ethylene: a semi-global 7-species/3-step mechanism and a 23-species/66-step reduced mechanism. Results are shown for laminar chemistry, as well as using a simple turbulence-chemistry interaction model. Results indicate that grid resolution effects are influenced by the chemistry mechanism, as well as assumed periodicity. Assumed periodicity is found to change the dynamics of combustion, resulting in changes in the shock location and peak pressure compared to the full geometry case. This is because in the full geometry case, a helical structure develops that cannot be reproduced on the periodic domains. Inclusion of a turbulence chemistry interaction model improves predictions com- pared to experiments, as well as reducing fluctuations in heat release rate and pressure in the combustor. The half and quarter periodic cases are more consistent with the full geometry with the model, but the eighth periodic case shows larger differences than laminar chemistry, including flame extinction for some cases." @default.
- W4205677276 created "2022-01-26" @default.
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- W4205677276 date "2022-01-03" @default.
- W4205677276 modified "2023-10-16" @default.
- W4205677276 title "Improved Delayed Detached-Eddy Simulation of a Round Supersonic Combustor With and Without Periodic Boundary Conditions" @default.
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- W4205677276 doi "https://doi.org/10.2514/6.2022-2251" @default.
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