Research on bubble jet of underwater explosion at the bottom of fixed square plate

The water jet formed after the collapse of bubble in near-field underwater explosion can cause serious damage to local structure ship, and formation is asymmetric, which makes it difficult measure its data experiment. At present, studies on pressure time history curves are still relatively rare. In order study characteristics jet, test 2.5 g TNT explosive at bottom fixed square plate different detonation distances was carried out. First, accuracy verified by sensor. Second, image whole process from initiation generated action steel obtained high-speed camera. Finally, time-history curve measured wall sensor center plate, another group sensors set 15 cm away as a control ensure that were not clutter. The recorded show error between shock wave overpressure, maximum radius pulse period empirical formula within 10%. results camera three jets be observed when burst distance 28 cm, but due long distance. When 15, 17.5 20 measured. However, short presence large number bubbles surface under wave, observe phenomenon with cameras. shows first peak, reach 1/4 wave. appears 1–3 ms interval each 0.9 2.4 ms. duration load 4–27 ?s, greatly reduced increases.