A 3D model of small-scale confined space with an inner size of 150 mm × 150 mm × 500 mm was set up. Based on the flame surface density model and the turbulent combustion model by Charlette et al.

a large wddy simulation (LES) had been carried out on the process of gas deflagration flame-turbulence interaction with continuous obstacles at two sides of the chamber. All numerical results have been compared to experimental data. It showed that the LES is capable to predict the flame structure

position

speed

and overpressure in the process of gas deflagration

and the applicability of the LES and turbulent combustion model on gas deflagration was verified. In addition

the interaction between gas deflagration and turbulence and the relationship were described quantitatively by the Karlovitz number

and the transient flame regimes also identified. Under condition of continuous obstacles at double sides of the chamber

the gas turbulent deflagration flame experienced in the subsequent states of corrugated flamelets zone and thin reaction zone.