Experimental investigation of water impact on axisymmetric bodies |
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| Authors: | G. De Backer M. Vantorre C. Beels J. De Pré S. Victor J. De Rouck C. Blommaert W. Van Paepegem |
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| Affiliation: | 1. Department of Civil Engineering, Ghent University, Technologiepark Zwijnaarde 904, B 9052 Zwijnaarde, Belgium;2. Department of Materials Science and Engineering, Ghent University, Sint-Pietersnieuwstraat 41, B 9000 Gent, Belgium;1. Aerospace Engineering, Mechanical Engineering Dept., Shiraz University, Shiraz, Iran;2. Mechanic Engineering Dept., Shiraz University, Shiraz, Iran;3. Electrical Engineering, Communication and Electronic Engineering Dept., Shiraz University, Shiraz, Iran |
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| Abstract: | The results of an elaborate experimental investigation on bottom slamming of axisymmetric objects are presented. Drop tests have been performed on a hemisphere and two conical shapes with different deadrise angles. The test setup is designed so as to prevent small rotations of the test objects which cause scatter in the measurement data. The pressure distribution and evolution as well as the body motion parameters are measured during impact. By means of a high speed camera the water uprise is visualized and the wetting factor is determined for the cones. The results are compared with a three-dimensional asymptotic theory for axisymmetric rigid bodies with constant entry velocity. The ratio between the registered peak pressures and the asymptotic theory are in accordance with comparable experiments in the literature. The asymptotic theory, however, is found to be quite conservative, since the measured peak pressure levels appear to be approximately 50% to 75% of the theoretical levels. |
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