Numerical simulation of boundary layer flashback of hydrogen-air premixed flame using an extended FGM method*

Numerical simulation is beneficial for the development of combustion devices, but large-scale combustion simulations require the use of a combustion model to reduce the computational cost. Flamelet-generated manifold (FGM) method has been widely used as an effective combustion model. However, the conventional FGM method cannot fully consider the effects of preferential diffusion and flame stretch, which have a large influence particularly on hydrogen flames. In this study, the FGM method is extended to explicitly consider the preferential diffusion, flame stretch, and non-adiabatic effects. The extended FGM method is applied to a boundary layer flashback simulation of hydrogen-air premixed flame under the condition of an unburnt temperature of 750 K, an ambient pressure of 1 atm, and an equivalence ratio of 0.5. The results show that the extended FGM method improves prediction accuracy on the flame propagation speed and distributions of physical properties compared with the conventional FGM method.