Impact of Venting Pressure on Explosion Dynamics and Flame Propagation of Natural Gas in Residential Buildings

To investigate the development process of natural gas explosions in residential buildings. A numerical simulation analysis was conducted using FLACS software to examine the impact of various venting pressures on natural gas deflagration characteristics. The results indicate that the venting sequence in each room remains consistent despite increases in venting pressure, with the kitchen venting first, followed by the secondary bedroom, and finally the master bedroom. Although increased venting pressure does not significantly alter the structural characteristics of indoor flames, it prolongs the flame filling time of each chamber, thereby increasing the flame spread rate and fuel combustion rate. Additionally, venting pressure influences the number of pressure peaks within each room. When the venting pressure P_v≤20 kPa, the impact of indoor natural gas explosions on occupants and structures is relatively minor. The findings provide a theoretical basis for analyzing indoor natural gas explosion causes and developing targeted prevention strategies to enhance safety.