Experimental study of the behaviour of mini-charge underwater explosion bubbles near different boundaries

摘要

This work experimentally studies the behaviour of underwater explosion bubbles near different, boundaries. The results are compared with-theoretical and experimental data on cavitation bubbles. Although. explosion and cavitation bubbles behave similarly on a..macroscopic-level, there are still soine differences, most of which are from the explosive nature-of the explosion bubble. The relationship between bubble migration and the-Kelvin impulse, surface-inertia m' and surface stiffness k* is investigated. We found that none of them comprehensively predicts the migration- Of both cavitation and explosion bubbles when boundary elasticity is considered. This elasticity should be considered as a relative value with respect. to bubble size. On the other hand, the phase between- local vibration-of boundaries and the pulsation of bubbles could be a useful predictive index of bubble migration. When using research results -developed for cavitation -bubbles in relation to explosion bubbles, the material presented here may be useful for pointing out -their similarities and differences.