LES investigation of nonequilibrium flow in a cavity-flameholding axisymmetric scramjet

View Video Presentation: https://doi.org/10.2514/6.2021-3536.vid The combustion performances in a 4.5 Mach cavity-flame holding axisymmetric scramjet fueled by ethylene are numerically investigated by LES (Large Eddy Simulation) with 97.05 million cells and DZFM (Dynamic Zone Flamelet model) with 210*91 flamelet zones. A detailed chemical reaction mechanism consisting of 66 irreversible reactions between 23 species is used for more accurate simulation. In this study, the combustion dynamics in the scramjet and the flame stabilization mechanism of the cavity are emphatically analyzed and the performance of the scramjet engine is evaluated.