Accuracies of reduced mechanisms for predicting acoustic combustion instabilities

The Rayleigh index of counterflow hydrogen–air diffusion flames is employed as a vehicle for quantifying inaccuracies of predictions caused by the introduction of reduced chemistry to decrease computation times. Inaccuracies of a systematically reduced 2-step mechanism, derived from a detailed 12-step mechanism for hydrogen–air systems, are small at low strain rates but become appreciable as extinction is...