Summary To elucidate the effect of pressure on liquid fuel boilover, a series of field experiments were carried out using a portable measuring setup at Hefei (Alt.: 0 m, P: 101 kPa) and Lhasa (Alt.: 3650 m, P: 64 kPa). It is found that for a given size of pan, the boilover premonitory onset time tp and the boilover onset time tb are delayed; the intensity of boilover is weaker in low pressure. For a given pressure, tp and tb in larger pan are shorter. In addition, the boiling point of water is still the critical of boilover premonitory period in low pressure, and the critical temperature at the interface is reduced as pressure drops when boilover occurs. Then a prediction equation was made to explain the effect of atmospheric pressure on tp and tb, which proves that the pan diameter has a negative correlation against with tp and tb, and there is a negative correlation between the boilover premonitory onset time tp and the low pressure PL when PL > 10 kPa.

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Flame morphological characteristics of buoyant jet fires from different upward inclined conditions have been experimentally studied in current work. The ethylene fueled jet flames were produced through a round nozzle with an inner diameter of 6mm. The results show that that both the flame horizontal projection length Lph and the vertical flame height L0 increase with the increasing of heat release rate Q. For a given Q, the Lph decreases with the increasing of upward inclined angle, while the L0 shows an inverse trend. The fitting results demonstrate that both the Lph and L0 can be well correlated by the dimensionless heat release rate Q*.