To address the critical need for safer and cleaner explosion suppression technologies in industrial settings

the suppression differences and mechanisms of the flame acceleration characteristics of CH

4

LPG and H

2

explosions by N

2

-water mist two-phase medium were investigated. The flame acceleration characteristics and suppression mechanism of methane

LPG and H

2

explosions in N

2

-water mist two-phase medium were studied qualitatively and quantitatively from both experimental and simulation aspects. The experimental results show that compared with single N

2

or water mist

the N

2

-water mist two-phase medium is more effective in reducing the flame propagation speed and delaying the formation of flame hydrodynamic structure

thus slowing down the flame acceleration characteristics. The simulation results show that this two-phase medium exhibits a strong inhibitory effect on the thermal diffusion instability of CH

4

and LPG

and significantly weakens the hydrodynamic instability of CH

4

LPG

and H

2

simultaneously. Mechanistic analysis confirms that the N

2

-water mist two-phase medium has both chemical and physical inhibitory effects

among which the physical inhibition plays a dominant role. In addition

the study reveals a linear correlation between the concentration of H radicals in the three

combustible gases and the laminar burning velocity. Moreover

this two-phase medium can significantly reduce the reaction rate of the H radical chain reaction

thereby effectively suppressing the laminar burning velocity.