In order to simplify the initiation structure and improve the reliability of the fuse warhead matching system,the cir-cumferential six-line initiation method of directional warhead was proposed to replace the central initiation.Based on the theory of fluid dynamics,the impact of the detonation wave under the circumferential six-line initiation was analyzed.Numerical simu-lation was carried out by LS-DYNA and warhead static explosion test was performed.The results show that,compared with the central initiation,the acceleration process of the fragment under the circumferential six-line initiation is related to the circum-ferential position,and there is a secondary acceleration process;Mach detonation waves are generated near the symmetry plane of adjacent detonation points,with a local pressure of up to 44.2 GPa and covering at the center of the warhead,and the pressure is over 100 GPa at the center.The influence of the end face sparse wave is weakened by the axial multi-point initi-ation,the fragment velocity is increased,and the consistency of the axial fragment velocity is obviously improved.The accura-cy of the numerical simulation is verified by warhead sample test,and the dispersion velocity error of fragment is within 8.1％,the initial velocity gain of fragments in different regions can reach 4.6％to 9.9％,indicating that the circumferential six-line initiation mode is an effective way to replace the central initiation of warhead.
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