Titanium-based solid metal hydrogen has gained popularity for storage technology. However, it is easy to form a explosive mixture of hydrogen and titanium dust during its application process. In this study, the explosive characteristics and mechanisms of a mixture of hydrogen and titanium dust were measured. The results indicate that the impact of hydrogen on the explosion pressure of titanium dust varies depending on particle size. For titanium dust measuring 41.9 μm, the explosion pressure increases with an increase in hydrogen concentration. However, for titanium dust with particle sizes of 28.2 μm and 4.91 μm, the explosion pressure initially decreases as the hydrogen concentration increases from 0 to 4%, and then rises as the hydrogen concentration increases from 4% to 25%. Furthermore, for titanium dust measuring 4.91 μm, the explosion pressure, rate of explosion pressure rise, flame continuity and propagation speed of the hybrid mixture at various hydrogen concentrations surpassed that of the corresponding pure hydrogen. This indicates that the hybrid explosion of H2 and fine titanium dust exhibits a synergistic effect. Finally, according the combustion products, the hybrid explosion mechanisms were analyzed.
