Experimental Study of Combustion Characteristics of Circular Ring Thin-Layer Pool Fire

Abstract

For clarifying the combustion behavior of a circular ring thin-layer pool fire, a series of experiments with varying pool diameters were carried out. The equivalent pool area of 0.071 m 2 and an initial n-heptane thickness of 10 mm were fixed. An electronic balance, a digital camera, and K-type thermocouples were used to measure burning rate, flame height, and centerline temperature, respectively. The results show that more burning stages can appear with the increase of the inner and outer diameters of the circular ring pool. Fire merging can occur at any one of the stages of initial growth, quasi-steady burning with surface boiling, transition to bulk boiling, and bulk boiling burning; moreover, the maximum burning rate of fire merging is about 3.5 times that of the ordinary pool fire with the same area. The core hollow region plays an important role in decreasing the burning rate, flame height, fire merging time, etc. The evolutions of the characteristic parameters, e.g., burning rate, flame height, and centerline temperature, were analyzed. New correlations for predicting these parameters were also proposed.

Experimental Study on the Burning Characteristics of Transformer Oil Pool Fires

“…Flame height associated with the heat flux distribution is a key parameter in pool fire thermal hazard analysis. ,, The flame height can be determined by means of the visible images obtained from the video recordings. In the tests, the two cameras were located far away from the pool at different positions.…”

“…Subsequently, Babrauskas provided the detailed values ( m ∞ , k β) for some fuels, including those of the transformer oil ( m ∞ = 0.039 g/(m 2 s), k β = 0.7 m –1 ) . These values have been widely used in some applications; − however, it is important to note that they were derived from experimental data with only two pool diameters ( D = 1.2 m and D = 1.7 m) for transformer oil pool fires . In recent years, the values of m ∞ and k β have been constantly updated with new experimental data for some fuels, such as gasoline and kerosene; , however, for transformer oils, these values have not been updated because of a lack of experimental data.…”

Numerical simulation of small pool fires incorporating liquid fuel motion

“…Liquid pool fires are one of the most fundamental fire scenarios, which attracted considerable attention [1][2][3][4][5][6][7]. Weckman and Strong [1] investigated turbulence structures of a medium scale methanol pool fire, providing detailed measurements of the velocity, temperature, turbulent kinetic energy and turbulent Reynolds number.…”

“…Vali et al [3] further studied the influences of the convection within a pool, confirming the existence of two vortices near the side wall of the container. Sun et al [4] studied the behaviour of a circular ring thin-layer pool fire and found that the burning rate changed with the increase of the inner and outer diameters of the circular ring pool.…”

Experimental Investigation on the Effect of a Reduced Pressure on the Combustion Characteristics and Flame Height of Gaseous Fuel Jets in Parallel Sidewalls

“…The flame plume scale features and air entrainment are crucial parameter that determines the hazardous area . Previous works have extensively focused on this issue − as a result of its practical significance to fire safety. Among them, several models, relating the dimensionless flame heights to some particular scaling parameters, proposed by Becker and Liang, Delichatsios et al, and Heskestad, are the most widely accepted.…”