Abstract
Operation Euroka was a 210,000 m 2 (50 acres) free-burning mass fire experiment carried out in Queensland, Australia. At the peak of the fire, 42 min after ignition, the maximum average induced horizontal wind velocity at the edge of the fire was 4.2 m/sec. The fire was of relatively low intensity, with a peak convective heat-release rate of 2.0×10 10 W and a peak radiant energy-release rate of 4×10 9 W. The ratio of the radius of the projection of the conical portion of the convection plume ontothe surface to the radius of the fire bed was only 0.18, compared with the value of 0.4 reported for the more-intense Flambeau fires. Consequently, this ratio may be a function of the fire intensity. If this is so, then, for a fire of a given size, the induced influw wind velocity is a stronger function than the cube root of the heat-release rate.
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