Study of explosion loads of Near-field Underwater Explosion

The shock wave of near-field underwater explosion is investigated experimentally and numerically. Three TNT charge of different shapes are detonated in the water tank. The framing & scanning ultra-high-speed photography system is applied to obtain the initial movement and trajectories of shock wave and detonation gas. Use the Arbitrary Lagrangian-Eulerian (ALE) method of LS-DYNA software to simulate the processes of near-field underwater explosion. Comparisons with the experimental tests are conducted to verify the results of numerical solutions. The movement characteristics of explosion loads are matched well. On the basic of experiments and simulations, the engineering formula of pressure for near-field shock wave is built.