THE INTERACTION OF SUBMERGED EXPLOSION BUBBLES WITH MOVABLE NON-DEFORMABLE BOUNDARIES
An experimental investigation of the interaction of an explosively created gas bubble in a fluid with structures floating on the surface was made. The structures were constrained to either simply heave, or pitch, or flex. Several tests with each type of structure were made. For each type of structure, the mass was held constant from one test to another but the stiffness of the structure was changed by means of springs so that the natural frequency of vibration was altered. By means of supports which did not influence the flow field the structures were held at half depth on the surface in their equilibrium position. Each structure was driven by pulsating gas bubbles created by exploding wires at two different depths below the surface. The motions of the bubbles and structures were recorded by a high speed movie camera. The tests were run in a partially evacuated steel tank so that the pressure above the liquid surface was approximately one-three hundred and sixtieth of normal atmospheric pressure. This permits the simulation on a small scale of the effects caused by gravity in large scale explosions in the ocean. A theory of the coupled oscillations of a non-migrating, small amplitude pulsating, spherical bubble, in an inviscid, incompressible liquid with a simple structure floating on the surface was developed and the theoretical results are compared with the empirical data. It is concluded that gravity plays such an important role in determining the phenomena that occur, that a theory which ignores gravity is inadequate even as an approximation. (auth)
- Research Organization:
- New York Univ., New York
- NSA Number:
- NSA-16-029509
- OSTI ID:
- 4776154
- Journal Information:
- Dissertation Abstr., Vol. Vol: 23; Other Information: Orig. Receipt Date: 31-DEC-62
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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