Effects of crossflow on burning rates of rectangular methanol pool fires.

摘要

Methanol pool fires were studied in a closed loop wind tunnel with crossflow speeds ranging from quiescent to 6 m/s. Burning rates for square trays ranging from 7.5 cm x 7.5 cm to 30 cm x 30 cm were measured. Geometry effects were investigated using circular and rectangular fuel trays. Mass fluxes of methanol measured in g/m2s were found to increase threefold for the smallest square tray through the crossflow range, and remain constant for the largest tray. A transition region at approximately 1 m/s associated with the detachment of the flame off the back lip of the tray was observed to result in a sudden drop in burning rate. Circular tray geometry was found to exhibit the same magnitude of burning rate as its square area equivalent without the transition zone. The orientation of rectangular shaped trays was found to have a significant impact on burning rate, indicating a dependence on stream-wise length.