Experimental and numerical study on flow dynamics and universal characteristics of ventilated supercavities behind different cavitators
In this study, physical aspects of a ventilated supercavity behind different cavitator geometries such as the hydrodynamic characteristics, distribution of pressure within the cavity, hysteresis phenomenon, and gas leakage mechanism were qualitatively and quantitatively investigated using experiment...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2024-01-01
|
| Series: | International Journal of Naval Architecture and Ocean Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2092678224000013 |
| _version_ | 1797339184428482560 |
|---|---|
| author | So-Won Jeong Van-Duyen Pham Byoung-Kwon Ahn Bu-Geun Paik |
| author_facet | So-Won Jeong Van-Duyen Pham Byoung-Kwon Ahn Bu-Geun Paik |
| author_sort | So-Won Jeong |
| collection | DOAJ |
| description | In this study, physical aspects of a ventilated supercavity behind different cavitator geometries such as the hydrodynamic characteristics, distribution of pressure within the cavity, hysteresis phenomenon, and gas leakage mechanism were qualitatively and quantitatively investigated using experimental and numerical methods. For the simulation and tunnel tests, we employed five cavitators, each with different angles (45°, 60°, 90°, 135°, and a 180° cavitator, commonly referred to as a disk cavitator), all sharing the same diameter. The results revealed that the drag force experienced on the cavitator decreased linearly with an increase in the ventilation rate, and a consistent trend was observed for all test cavitator angles. Through experimental measurements, a universal equation has been derived to predict the drag force exerted on a supercavitating vehicle employing a cavitator. In addition, the pressure distribution inside the supercavity was significantly influenced by the angle of the cavitator. The pressure kept almost unchanged in the first half of supercavity; a slight increase in pressure occurred in the remainder of the supercavity. Twin-vortex gas leakage mode was clearly observed. The distance between the two hollow vortices increased significantly, whereas the incline angle of these vortices and the horizontal line changed insignificantly. |
| first_indexed | 2024-03-08T09:42:17Z |
| format | Article |
| id | doaj.art-f68a7bf666aa406481a023b0b2fe2b59 |
| institution | Directory Open Access Journal |
| issn | 2092-6782 |
| language | English |
| last_indexed | 2024-03-08T09:42:17Z |
| publishDate | 2024-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | International Journal of Naval Architecture and Ocean Engineering |
| spelling | doaj.art-f68a7bf666aa406481a023b0b2fe2b592024-01-30T04:14:40ZengElsevierInternational Journal of Naval Architecture and Ocean Engineering2092-67822024-01-0116100582Experimental and numerical study on flow dynamics and universal characteristics of ventilated supercavities behind different cavitatorsSo-Won Jeong0Van-Duyen Pham1Byoung-Kwon Ahn2Bu-Geun Paik3Department of Autonomous Vehicle System Engineering, Chungnam National University, Daejeon, Republic of Korea; Korea Research Institute of Ships and Ocean Engineering (KRISO), Daejeon, Republic of KoreaDepartment of Autonomous Vehicle System Engineering, Chungnam National University, Daejeon, Republic of KoreaDepartment of Autonomous Vehicle System Engineering, Chungnam National University, Daejeon, Republic of Korea; Corresponding author.Korea Research Institute of Ships and Ocean Engineering (KRISO), Daejeon, Republic of KoreaIn this study, physical aspects of a ventilated supercavity behind different cavitator geometries such as the hydrodynamic characteristics, distribution of pressure within the cavity, hysteresis phenomenon, and gas leakage mechanism were qualitatively and quantitatively investigated using experimental and numerical methods. For the simulation and tunnel tests, we employed five cavitators, each with different angles (45°, 60°, 90°, 135°, and a 180° cavitator, commonly referred to as a disk cavitator), all sharing the same diameter. The results revealed that the drag force experienced on the cavitator decreased linearly with an increase in the ventilation rate, and a consistent trend was observed for all test cavitator angles. Through experimental measurements, a universal equation has been derived to predict the drag force exerted on a supercavitating vehicle employing a cavitator. In addition, the pressure distribution inside the supercavity was significantly influenced by the angle of the cavitator. The pressure kept almost unchanged in the first half of supercavity; a slight increase in pressure occurred in the remainder of the supercavity. Twin-vortex gas leakage mode was clearly observed. The distance between the two hollow vortices increased significantly, whereas the incline angle of these vortices and the horizontal line changed insignificantly.http://www.sciencedirect.com/science/article/pii/S2092678224000013SupercavitationVentilationCavitatorSupercavity formationDrag force |
| spellingShingle | So-Won Jeong Van-Duyen Pham Byoung-Kwon Ahn Bu-Geun Paik Experimental and numerical study on flow dynamics and universal characteristics of ventilated supercavities behind different cavitators International Journal of Naval Architecture and Ocean Engineering Supercavitation Ventilation Cavitator Supercavity formation Drag force |
| title | Experimental and numerical study on flow dynamics and universal characteristics of ventilated supercavities behind different cavitators |
| title_full | Experimental and numerical study on flow dynamics and universal characteristics of ventilated supercavities behind different cavitators |
| title_fullStr | Experimental and numerical study on flow dynamics and universal characteristics of ventilated supercavities behind different cavitators |
| title_full_unstemmed | Experimental and numerical study on flow dynamics and universal characteristics of ventilated supercavities behind different cavitators |
| title_short | Experimental and numerical study on flow dynamics and universal characteristics of ventilated supercavities behind different cavitators |
| title_sort | experimental and numerical study on flow dynamics and universal characteristics of ventilated supercavities behind different cavitators |
| topic | Supercavitation Ventilation Cavitator Supercavity formation Drag force |
| url | http://www.sciencedirect.com/science/article/pii/S2092678224000013 |
| work_keys_str_mv | AT sowonjeong experimentalandnumericalstudyonflowdynamicsanduniversalcharacteristicsofventilatedsupercavitiesbehinddifferentcavitators AT vanduyenpham experimentalandnumericalstudyonflowdynamicsanduniversalcharacteristicsofventilatedsupercavitiesbehinddifferentcavitators AT byoungkwonahn experimentalandnumericalstudyonflowdynamicsanduniversalcharacteristicsofventilatedsupercavitiesbehinddifferentcavitators AT bugeunpaik experimentalandnumericalstudyonflowdynamicsanduniversalcharacteristicsofventilatedsupercavitiesbehinddifferentcavitators |