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C. Eberle, P. Gerlinger , M. Aigner
This paper presents time-resolved numerical simulations of a well-characterized aero-engine model combustor. Recently published unsteady Reynolds averaged Navier-Stokes simulations (URANS) are compared to large eddy simulations (LES). Finite-rate chemistry, where a separate transport equation is solved for each chemical species, is employed for the gas phase, a sectional approach for PAHs, and a two-equation model for soot. Thus feedback effects such as the consumption of gaseous soot precursors by growth of soot and PAHs are inherently captured accurately. The numerical results (velocity components, temperature and soot volume fraction) compare well with experimental data. No significant differences between URANS and LES are found for time-averaged velocity components and time-averaged temperature, while the prediction of the soot distribution was significantly improved by LES. It will be shown that accurate description of the instantaneous flame structure, especially the hydroxyl distribution, by resolution of turbulent scales is of fundamental importance for accurate soot predictions in the present test case.
Deutscher Luft- und Raumfahrtkongress 2015, Rostock
Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn, 2015
21,0 x 29,7 cm, 12 Seiten
Stichworte zum Inhalt:
computational fluid dynamics, soot modelling