Intrinsic cellular instabilities of hydrogen laminar outwardly propagating spherical flames

In this study, the influences of pressure, temperature and equivalence ratio on onset cellular instabilities in premixed hydrogen/air laminar flames were studied using a constant volume fan-stirred combustion vessel. The instability is marked by critical stretch rate, at which flame speed rapidly deviates from its prior response to stretch. It noted that Peclet number, Pecl, increases with increasing both temperature, indicating more stable flame. Whilst, Pecl decreases initial pressure due associated decrease Markstein Mab pressure. Empirical correlations Kcl, as function Mab, are developed presented. Such can be employed estimate severity large-scale atmospheric hydrogen flames.