Numerical study on the stability of the supersonic turbulent lifted flame using high resolution schemes

Series of numerical study have for the numerical solution of the coaxial supersonic combustion and its stability. LES simulation of supersonic combustion flow fields necessitates the upwind-based high resolution schemes to capture the fine scale instabilities those might be dissipated with conventional schemes. High resolution schemes with fifth-order space discretization have been implemented. A validation study has been carried out for a coaxial supersonic combustor experiment. A numerical study is carried out to identify the instability capturing characteristics of high resolution schemes for compressible fuel-oxidizer mixing layer with combustion. Results show that the higher order schemes show clear improvement in capturing fine scale instabilities, while oMLP scheme exhibits unbeatable performance without a big expense. Parametric studies have been carried to investigate the effects of the combustor divergence angle and the length of the constant area combustor section on the stability and lift-off of supersonic flames.