Experimental study and global correlation on burning rates and flame tilt characteristics of acetone pool fires under cross air flow

摘要

This paper reports a new global relation developed to characterize burning behavior of acetone pool fire under crosswind ranged from 0 to 2.5 m/s with incremental change of about 0.5 m/s. With the increase of the cross air flow speed, results show that the enhancement rate of the mass burning rate relative smaller pool fires was higher than relative larger pool fires. And the overall mass burning rate of the pool fire increases linearly with the cross air flow speed from 0 to 0.5 m/s, the mass burning rate increase with the increase of cross air flow speed. Then it began to drop a bit slightly. Finally, the mass burning rate gradually increased as the cross wind speed increases from 1.5 to 2.5 m/s. A global correlation by introducing the diffusive transfer B number, with wind speed and pool dimension aspect ratio accounted for, is then developed for the mass burning rate of square acetone pool fires. The mean flame length of acetone pool fires is well correlated linearly with Froude number. And the tangent values of flame tilt angle with cross air flow can be correlated well by previous model.