Detonation Dynamics and Explosion Study Center (DDESC), 101, Tirupati, Andhra Pradesh, India
Abstract:
Fire accidents in closed regions, transport carriers, and auditoriums are influenced by the confinement conditions. The current experimental investigation is intended to find the effect of obstacles, obstacle-free space, gas flow, and near-wall turbulence on the flame acceleration. Two rows of bench-shaped obstacles (replicate chairs in transport carriers) enhance the flame speed in the obstacle-free path. Turbulence intensity is higher in local regions where the flow becomes highly subsonic and mildly supersonic, which enhances the flame speed. The flame front-driven supersonic flow can form negative shock waves, which can further increase the flame speed. Careful design of confined geometry can prevent accidents or slow down the flame propagation.