Numerical study of low frequency combustion instability in dumpe combustor

Large-eddy simulation( LES) and premixed combustion model have been efficiently implemented to study the combustion instabilities in ramjet combustors. The main objective is to predict dominant frequencies and various flow features of the combustors. Combustion instabilities in the ramjet dump combustor were numerically simulated. Low-frequency, large-amplitude instabilities are observed, and instability frequencies and flame spread during various operating conditions are in good agreement with experimental observations. The results show large vortices structures dominate the flame propagation and vortices convection coupled unsteady heat release excite pressure oscillation in ramjet combustor.