Effect of the bifurcating duct on the gas explosion propagation characteristics

Abstract

The explosion wave overpressure and the flame propagation velocity of the gas explosion in a bifurcating duct are experimentally measured and theoretically analyzed. The results show that the effect of the bifurcation on the flame velocity and overpressure is obvious. Especially, the explosion wave overpressure and the flame propagation velocity increase sharply at the bifurcation point, and the surface at the bifurcation location is destroyed seriously. The gas explosion propagation is verified to suffer a dual effect of sudden expansion of the area and obstruction induction.

Numerical simulation on influence of initial pressures on gas explosion propagation characteristics in roadway

“…Because many transient and intermediate products are produced in the development process of the explosion, the explosion process is easily affected by external factors. At present, the influencing factors of gas explosion were studied by the experimental methods (Ye and Jia, 2014;Ye et al, 2017a), numerical simulation (Yang et al, 2020;Liu et al, 2022), and theoretical calculation (Cheng et al, 2017;Cheng et al, 2021). In general, the influencing factors of gas explosions are divided into two types: internal influencing factors and external influencing factors.…”

Damage Characteristics of Roadway Wall under the Impact of Gas Explosion

“…Gas explosion accident in coal mine will not only cause casualties of operators in the roadway, but also destroy the roadway wall structure and mine ventilation facilities, resulting in adverse social impact [1][2][3]. In order to effectively control the damage caused by gas explosion, many scholars have studied the propagation characteristics and damage mechanism of gas explosion, and have analyzed the influencing factors, propagation law, the destructive effect of gas explosion and formulated various measures to prevent and suppress explosion, and achieved fruitful results [4][5][6][7][8][9][10][11][12][13]. However, the damage characteristics of roadway wall under the impact of gas explosion need to be deeply analyzed.…”

Effect of Abrupt Changes in the Cross-Sectional Area of a Pipe on Flame Propagation Characteristics of CH4/Air Mixtures

“…In addition, the explosion characteristics of premixed gases are also different in explosion vessels with different geometric shapes. These geometric structures include bifurcations, − bends, , and connected containers. − Changes in the structure of the explosion vessel will reflect the pressure wave and disturb the air flow to form a turbulent flame, and the formation of a turbulent flame will increase flame propagation velocity and explosion overpressure.…”