Notice of RetractionNumerical and experiments investigations of the process for explosion load drive liquid dispersed
In the present study, a series of terminal ballistics numerical analysis and experiments were performed to investigate the process for explosion load drive the based-water extinguisher dispersed. In the Numerical simulation, for the representative fire extinguishing warhead, the simulation model was built, The variety rule between the loading coefficient (drive charge divide liquid mass) and the breach time on shell, the loading coefficient and the speed of liquid-air interface at the shell breach initially phase was respectively obtained on the results from calculation of Ls-Dyna program. For the availability of simulation data in numerical computation, the confirmatory tests on the same condition was done, the result between experiment and numerical simulation was consistent. It was indicated that the numerical simulation method was correct and available.
Far-field dispersal modeling for fuel-air-explosive devices
A computer model for simulating the explosive dispersal of a fuel agent in the far-field regime is described and is applied to a wide variety of initial conditions to judge their effect upon the resulting fuel/air cloud. This work was directed toward modeling the dispersal process associated with Fuel-Air-Explosives devices. The far-field dispersal regime is taken to be that time after the initial burster charge detonation in which the shock forces no longer dominate the flow field and initial canister and fuel mass breakup has occurred. The model was applied to a low vapor pressure fuel, a high vapor pressure fuel and a solid fuel. A strong dependence of the final cloud characteristics upon the initial droplet size distribution was demonstrated. The predicted fuel-air clouds were highly non-uniform in concentration. 18 refs., 86 figs., 4 tabs.
DICE-FAE Analysis of Fuel Dispersal and Detonation from a Fuel-Air-Explosive Device
Abstract : Using the DICE-FAE code, a numerical solution was generated of both the dispersal and detonation phases for a BLU-73 liquid Fuel-Air-Explosive device. DICE-FAE is a two-dimensional, implicit, Eulerian, finite difference code which treats fuel-air mixtures, fuel droplet break-up, fuel phase changes, and fuel-air detonation dynamics. The fuel droplets flow through the air and interact with the air through drag and heat exchange mechanisms. The cloud dispersal analysis started with initial conditions representing the fuel mass and burster products just after canister break-up. The FAE detonation analysis commenced with the calculated dispersed cloud fuel-air characteristics and with second event initiation by a centrally-located explosive charge. Detailed comparisons from the DICE-FAE results and experimental data have not been completed, but the final calculated cloud dimensions and peak detonation pressures appear reasonable. The computational results also provide a detailed prediction in terms of space and time of the fuel concentrations during the dispersal phase and of the pressures and temperatures during the detonation phase. (Author)