Evolution of premixed stoichiometric hydrogen/air flame in a closed duct

Flame propagation of premixed hydrogen-air explosion in a closed duct with obstacles

An experimental study on premixed syngas/air flame propagating across an obstacle in closed duct

Combined effect of ignition position and equivalence ratio on the characteristics of premixed hydrogen/air deflagrations

Explosion venting of flammable gases within confined spaces, which may be an explosion hazard or a hazard mitigation measure, has gained widespread attention from researchers in various fields. A substantial number of scientific studies have found that complex initial and boundary conditions lead to complex and diverse peak structures in vented gas explosion pressure curves. This poses major challenges for the accurate prediction and scientific research on vented gas explosion overpressures as well as incident prevention and control. By reviewing the existing literature, we analysed the distribution characteristics of multi-overpressure peak structures and the formation mechanisms of typical peak structures in vented gas explosion pressure curves. On this basis, the influence of different factors on various peak structures are described in detail, and a quantitative method for evaluating the correlation between influencing factors and peak structures is proposed. Our analysis revealed that peaks Pb, Pext, Pmfa, and Pac had the highest occurrence frequencies in the vented explosion pressure curves and were the dominant peaks during a vented gas explosion process. Influencing factors with the highest degrees of correlation with Pb, Pext, Pmfa and Pac include vent opening pressure, ignition location, obstacles, and gas concentration. In particular, gas concentration was identified as a key condition that influenced all typical pressure peak structures. Our conclusions may serve as a reliable theoretical basis for future research on safety relief theories and prevention of gas explosion incidents.

Research progress on multi-overpressure peak structures of vented gas explosions in confined spaces

Effects of ignition location, obstacles, and vent location on the vented hydrogen-air deflagrations with low vent burst pressure in a 20-foot container

Flame propagation across a flexible obstacle in a square cross-section channel

Experimental study of flame propagation across a perforated plate

Geometric influence of perforated plate on premixed hydrogen-air flame propagation

Experimental study of flame propagation across flexible obstacles in a square cross-section channel

Zhi Zhang

Papers

Effects of ignition location, obstacles, and vent location on the vented hydrogen-air deflagrations with low vent burst pressure in a 20-foot container

Flame propagation across a flexible obstacle in a square cross-section channel

Experimental study of flame propagation across a perforated plate

Geometric influence of perforated plate on premixed hydrogen-air flame propagation

Experimental study of flame propagation across flexible obstacles in a square cross-section channel