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Randomized trial examines hydrogen explosion suppression in confined spaces, indicating CO2's critical role across fuel regimes.
This study elucidates inert gas suppression mechanisms on hydrogen explosions, focusing on CO 2 's kinetic role under fuel-lean and fuel-rich regimes. Integrating experimental and numerical analyses, we compare suppression efficacy of various inert gases at identical equivalence ratios. Results show monotonic enhancement in suppression—reducing P max , V max , flame temperature, and luminosity—with increasing inert gas volume fraction. Ar is weakest, CO 2 strongest; a binary mixture shows synergistic enhancement. CO 2 mechanisms differ between regimes: in fuel-lean, it achieves high efficiency via superior heat capacity and chemical inhibition; in fuel-rich, it facilitates OH regeneration, partially counteracting suppression, making CO 2 less effective. These findings provide critical insights for hydrogen safety protocols across varying stoichiometries.
Zhang et al. (2026) studied this question.