Abstract
Pool fires are known to exhibit self-sustained oscillatory behavior, which plays an important role in the understanding of flame and fire spreading. To investigate the effect of ambient pressure on oscillating behavior of pool fires, the ethanol pool fires with diameters from 2 to 10 cm were conducted under a wide range of pressure from 0.6 to 2.5 atm, where different pressure environments were achieved and maintained using a closed high pressure chamber. Based on the momentum conservation equation for the gas movement driven by buoyant force, the Gr number was derived to illustrate the change of flame structure and oscillation frequency. The results show that the Gr number could explain the flame structure changing from laminar to turbulent. The oscillation intensity, which was redefined using the probability contour of the flame, could be related with Grashof. Furthermore, it was noticed that the influence of ambient pressure and gravity on oscillation frequency depends on the different oscillation mechanisms. Based on the one-dimensional movement of vortex along the axis, a theoretical model was proposed to explain the effect of ambient pressure and gravity on frequency, and then the obtained relationship between Strouhal and Grashof was verified by the measured value.
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