Effect of turbulent combustion model on simulation of hydrogen supersonic combustion

The equilibrium chemistry model using assumed probability density function(PDF) and the flamelet model were adopted to numerically simulate the reactive flow filed of the supersonic combustor of The Geman Aerospace Center.The calculated results were compared with those of the finite-rate chemistry model and the experiments.Finite volume method was used to discretize Favre-averaged Navier-Stokes equations,and κ-ε turbulence model was employed.The results show:(1)the finite-rate chemistry model and the equilibrium chemistry model using assumed PDFcannot capture fine structures of near-field and far-field from the hydrogen injector,respectively,while the flamelet model can predict the flow field well,and computation time of the latter two models is saved about 38% over that of the finite-rate chemistry model;(2) the interaction between turbulence and chemistry in the reactive flow filed of the supersonic combustor should not be ignored,and the flamelet model may have a bright prospect in engineering practices in terms of efficiency and accuracy.