The similarity research on underwater explosion of directional warhead

In order to solve the problem of high expense in the underwater explosion of directional warhead, the similarity is researched by dimensional analysis. The aim is to research the relationship of explosion pressure between original and small scale models. The result of dimensional analysis is verified by the simulation of AUTODYN. As a result, if the mass of TNT in the small scale model is β³ times of that in original model, the peak pressure in original model is as same as that in the small scale at β times distance. It indicates that the small scale model can replace the original model if the similarity rule is used. This research provide the theoretical basis for underwater explosion experiment which uses the small scale model. It has engineering significance to some extent.