This paper reports on Large Eddy Simulation (LES) of supersonic combustion characteristics in a model scramjet combustor based on an Open Source Field Operation and Manipulation (OpenOAM) computing platform, with slip and viscous wall boundary conditions. The three-dimensional LES solver, which adopts a Partially Stirred Reactor (PaSR) sub-grid combustion model along with a skeleton 27 steps hydrogen chemical kinetics, is used to study strut-enhanced mixing and combustion. LES results show that mean axial velocity and temperature at different cross sections agree with experimental data, and spatial evolution of the supersonic diffusion flame is well captured. Effects of shear layers growth, development and breaking down on combustion processes are discussed in detail, and the coupling effects with unsteady vortex shedding at the strut base are revealed. Different mixing modes are recognized after the strut where subsonic and supersonic flows co-exist.
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