Experimental investigation of tunnel fire spread under moving fire source conditions.

ABSTRACT: Fires caused by moving fire sources are more complex and hazardous than those initiated by stationary sources. In tunnel fire scenarios, ignition sources often vary in velocity and elevation, which markedly affect fire dynamics. A small-scale experimental platform was employed to examine the impact of fire source height and speed on flame behavior, smoke propagation, and temperature distribution in tunnel fires. The experimental results demonstrate that the critical velocity associated with noticeable flame attenuation exhibits a distinct non-monotonic dependence on fire-source elevation. Specifically, as the height increases from 7.5 cm to 10 cm, the critical velocity rises from 0.3 m/s to 0.8 m/s, yet decreases to 0.5 m/s at 12.5 cm. At a fixed height, increasing the movement speed from

SUBMITTER: Wang T 

PROVIDER: S-EPMC12931806 | biostudies-literature | 2026

REPOSITORIES: biostudies-literature