Flame pulsation frequency of conduction-controlled rectangular hydrocarbon pool fires of different aspect ratios in a sub-atmospheric pressure

Abstract

This paper reveals the flame pulsation behavior of conduction-controlled rectangular hydrocarbon pool fires in a sub-atmospheric pressure. Experiments are carried out in both normal- (100kPa; Hefei city, altitude 50m) and reduced (64kPa; Lhasa city, altitude 3650m) pressure atmospheres, using rectangular ethanol pool fires with the same area S (36cm2) but different aspect ratios (long side divided by short side n=L/W=1, 2, 3, 4, 8). Results show that the flame pulsation frequency of the pool fire changes small with pressure, meanwhile increases with aspect ratio, which can be well characterized by a non-dimensional function between Strouhal number (St) and Froude number (Fr).