Explosion dynamics of premixed LPG/H2 fuel in a confined space

Abstract

To reveal the impact law of H2 on the kinetics of LPG explosion reaction, a list of explosion experiments were conducted in a 10 L duct with LPG/H2 as the research object. The influence of H2 volume fraction on the explosion characteristics of LPG was investigated, and analyzed the combustion mechanism of mixed-gas. Results indicate that the flame development of LPG/H2 mixed under different RH conditions is divided into four different development modes. The Pmax increase, and the explosion relief pressure decrease as the RH elevates. The effect of equivalence ratio on the Thermo-Diffusive instability and Darrieus-Landau instability of LPG/H2 mixture is large. Under the same conditions, there is a noticeable discrepancy in the flame duration and explosive pressure duration. The chain reaction (R2: H2 + OOH + H, R3: H2 + OHH2 + OH), which produces a significant amount of H, OH important radicals and boosts the reaction activity, is the principal way that hydrogenation affects the reaction of LPG/H2 gas combination. The impact of H2 on LPG in terms of reaction mechanism is explained and confirmed by the fact that hydrogenation encourages the rise of the sensitivity coefficient of the fundamental reactions of the LPG/H2 mixture explosion.