Experimental investigation of drag characteristics of ventilated supercavitating vehicles with different body shapes
| Autor: | Hyoung-Tae Kim, So-Won Jeong, Young-Rae Jung, Yunhua Jiang, Byoung-Kwon Ahn |
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| Rok vydání: | 2019 |
| Předmět: |
Fluid Flow and Transfer Processes
Physics Flow visualization Drag coefficient Mechanical Engineering Flow (psychology) Computational Mechanics Mechanics Condensed Matter Physics 01 natural sciences 010305 fluids & plasmas symbols.namesake Particle image velocimetry Mechanics of Materials Drag Cavitation 0103 physical sciences Froude number symbols 010306 general physics Supercavitation |
| Zdroj: | Physics of Fluids. 31:052106 |
| ISSN: | 1089-7666 1070-6631 |
| Popis: | This paper presents an experimental investigation on drag characteristics and flow physics of ventilated supercavitating objects with different body shapes. The test model consists of a disk-type cavitator with two different forebodies (slender and blunt shape) and three different rear bodies (flat, shrinkage, and expanded shape). Experiments are conducted in a cavitation tunnel of the Chungnam National University. First, the drag forces acting on different body-combinations in fully wetted conditions are measured. The results show that the drag coefficients strongly depend on the body shapes. It explains in detail through particle image velocimetry measurements. Second, the drag characteristics are systematically examined over a broad range of ventilation rates. The formation and the drag characteristics of the foamy and clear supercavity flow are investigated for different Froude number conditions. The results reveal that the drag of the blunt forebody is smaller than that of the slender fore body in foamy cavity conditions. In ventilated supercavity conditions, supercavity shapes according to Froude numbers are examined and corresponding effects on drag characteristics are analyzed. The results show that the drag coefficients of the models with the expanded rear body are larger than that of models with the flat and shrinkage rear bodies until the cavity covers the body. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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