Influence of shell structure on dispersing velocity of fuel-air mixture

In order to study the dispersal characteristics for different shell structures, the processes of fuel dispersion and shell breakage driven by central explosive are simulated by LS-DYNA code, and the simulated and experimental results are compared. The boundary expansion state of fuel and the process of shell breakage are obtained. The variation of cutting force with time and the maximum dispersing velocity of different shell structures are analyzed. Results show that the dispersing velocity of fuel could be effectively increased by enhancing the axial tension while satisfying the structural strength and the same radial strength. When axial tension is up to 0.7×10⁶ N, the greater dispersing velocity could be produced by stiffener structure. The maximum dispersing velocity of non-stiffener structure is 285.3 m/s. The maximum dispersing velocity of stiffener structure is 316.3 m/s, that could be increased by 10.8% with the same dose for non-stiffener structure.