Numerical Simulation on Dispersal Character of Fuel by Central HE

Abstract

A fuel-air explosive (FAE) device consists of a shell (top-end cover, bottom-end cover, shell-side wall), a mixed fuel, a central pipe and a burst high-explosive (HE) charged in the central pipe.The mixed fuel is filled in a column structure and dispersed by the explosion drive of central burstHE in the central pipe. The dispersed fuel mixes with air, which produces combustible cloudwhich can be detonated. That is the fuel-air explosive (FAE). The height and ignition positionof the central HE charged column affect the fuel dispersal process. The initial stage of fueldispersal was simulated by numerical computation. The simulation result indicated that thedistribution of fuel dispersal velocity, when the central HE is ignited at the end, is not the sameas that when the central HE is ignited on the axis of the central HE simultaneously. When theratio of the column height of the central HE and that of the FAE device is 0.64~0.73, the distributionof fuel dispersal velocity has little difference when the central HE is ignited at the end of column.But, when the ratio of the column height of the central HE and that of the FAE device is 0.89,the fuel axial dispersal velocity is obviously more than that when the ratio of the column heightof the central HE and that of the FAE device is 0.64~0.73.