EXPERIMENTAL RESEARCH ON THE SHAPE CHARACTERS OF NATURAL AND VENTILATED SUPERCAVITATION |
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| Authors: | ZHANG Xue-wei WEI Ying-jie ZHANG Jia-zhong WANG Cong YU Kai-ping |
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| Affiliation: | 1. Department of Aerospace Engineering, The Pennsylvania State University, State College, PA 16802, USA;2. Applied Research Laboratory, The Pennsylvania State University, PO Box 30, State College, PA 16804, USA;1. Mechanical Engineering Department, Ferdowsi University of Mashhad, Mashhad, Iran;2. Mechanical Engineering Department, Quchan University of Technology, Quchan, Iran |
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| Abstract: | ![]()
A series of projectile and water-tunnel experiments were conducted to investigate the shape characters of natural and ventilated supercavitation. It was found that the shape and dimensions of both the natural supercavitation and the ventilated supercavitation are similar through the comparison of them when the cavitation number is small and equal, and the contour of both the natural supercavitation and the ventilated supercavitation can be calculated effectively with the Savchenko formula. The gravity effect can induce the asymmetry of ventilated supercavitation, and the asymmetry is more apparent as the Froude number is smaller. The empirical formula for calculating the axial deformation of ventilated supercavitation was corrected and expanded based on experiment data. The evolution rules of both the natural supercavitation and the ventilated supercavitation were described, and the vortex frequency of natural cavitation was obtained. In addition, the hysteretic aspect was observed between the development and the fall process of ventilated cavitation. |
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| Keywords: | natural cavitation ventilated cavitation shape characters water tunnel experiment projectile experiment |
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