Comparison of flamelet and transported species-based modeling of scramjet combustor

In this study, two classes of turbulence-combustion interaction models - compressible flamelet/progress variable (CFPV) model and various finite-rate transported-species models - are compared for supersonic combustion modeling within the framework of Large-Eddy Simulation. The models are tested by simulating combustion in scramjets. The simulations show that CFPV gives results which are closer to those of the finite-rate models when compared with the original flamelet/progress variable model. It has also been found that the CFPV model tends to under-predict the chemical reaction rate compared to the models based on the eddy dissipation concept and the partially-stirred reactor, while the quasilaminar model tends to over-predict the reaction rate for the supersonic combustion investigated in this work.