Study on the formation and characteristics of unstable sheet cavitation on hydrofoils
Hydrofoils, as fundamental components of hydraulic machinery, directly influence the performance of such machinery. This study conducted an analysis of the cavitation characteristics of hydrofoils at a + 4° angle of attack under various cavitation numbers using numerical simulation and experimental...
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| Format: | Article |
| Language: | English |
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Elsevier
2024-12-01
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| Series: | Ultrasonics Sonochemistry |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1350417724003225 |
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| author | Lin Wang Di Chen Fangping Tang Haiyu Liu |
| author_facet | Lin Wang Di Chen Fangping Tang Haiyu Liu |
| author_sort | Lin Wang |
| collection | DOAJ |
| description | Hydrofoils, as fundamental components of hydraulic machinery, directly influence the performance of such machinery. This study conducted an analysis of the cavitation characteristics of hydrofoils at a + 4° angle of attack under various cavitation numbers using numerical simulation and experimental research methods. The focus of the research was to explore the phenomenon of unstable sheet cavitation and its causes, as well as to reveal the characteristics of the re-entrant jet. The large eddy simulation method was employed to calculate the cavitation morphology under three different cavitation numbers. The method is highly consistent with the experimental results in simulating the small-scale detachment at the tail of unstable sheet cavitation and the large-scale shedding of cloud cavitation. The study found that the detachment of unstable sheet cavitation is closely related to the re-entrant jet, which exhibits transient and abrupt characteristics during the unstable sheet cavitation phase. Furthermore, by applying FFT processing to the distribution of maximum reverse velocity and the spatiotemporal changes of Ux on characteristic lines, eigenfrequency of the detachment of unstable sheet cavitation were identified. The research results indicate that cavitation mainly show as sheet cavitation when the cavitation closure point does not exceed the zero-slope point. Beyond this point, it transitions to cloud cavitation. This study provides new insights into the cavitation phenomenon of hydrofoils and offers quantitative research on the phenomenon of unstable sheet cavitation. |
| format | Article |
| id | doaj-art-bcdb6c6a2b2d480aa1dbbdb471798cbc |
| institution | Kabale University |
| issn | 1350-4177 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Ultrasonics Sonochemistry |
| spelling | doaj-art-bcdb6c6a2b2d480aa1dbbdb471798cbc2024-11-22T07:36:37ZengElsevierUltrasonics Sonochemistry1350-41772024-12-01111107074Study on the formation and characteristics of unstable sheet cavitation on hydrofoilsLin Wang0Di Chen1Fangping Tang2Haiyu Liu3School of Hydraulic Science and Engineering, Yangzhou University, 225000, ChinaSchool of Hydraulic Science and Engineering, Yangzhou University, 225000, ChinaSchool of Hydraulic Science and Engineering, Yangzhou University, 225000, China; Corresponding author.School of Electrical Engineering, Yancheng Institute of Technology, 224000, ChinaHydrofoils, as fundamental components of hydraulic machinery, directly influence the performance of such machinery. This study conducted an analysis of the cavitation characteristics of hydrofoils at a + 4° angle of attack under various cavitation numbers using numerical simulation and experimental research methods. The focus of the research was to explore the phenomenon of unstable sheet cavitation and its causes, as well as to reveal the characteristics of the re-entrant jet. The large eddy simulation method was employed to calculate the cavitation morphology under three different cavitation numbers. The method is highly consistent with the experimental results in simulating the small-scale detachment at the tail of unstable sheet cavitation and the large-scale shedding of cloud cavitation. The study found that the detachment of unstable sheet cavitation is closely related to the re-entrant jet, which exhibits transient and abrupt characteristics during the unstable sheet cavitation phase. Furthermore, by applying FFT processing to the distribution of maximum reverse velocity and the spatiotemporal changes of Ux on characteristic lines, eigenfrequency of the detachment of unstable sheet cavitation were identified. The research results indicate that cavitation mainly show as sheet cavitation when the cavitation closure point does not exceed the zero-slope point. Beyond this point, it transitions to cloud cavitation. This study provides new insights into the cavitation phenomenon of hydrofoils and offers quantitative research on the phenomenon of unstable sheet cavitation.http://www.sciencedirect.com/science/article/pii/S1350417724003225HydrofoilUnstable sheet cavitationCavitation sheddingRe-entrant jetLarge eddy simulation |
| spellingShingle | Lin Wang Di Chen Fangping Tang Haiyu Liu Study on the formation and characteristics of unstable sheet cavitation on hydrofoils Ultrasonics Sonochemistry Hydrofoil Unstable sheet cavitation Cavitation shedding Re-entrant jet Large eddy simulation |
| title | Study on the formation and characteristics of unstable sheet cavitation on hydrofoils |
| title_full | Study on the formation and characteristics of unstable sheet cavitation on hydrofoils |
| title_fullStr | Study on the formation and characteristics of unstable sheet cavitation on hydrofoils |
| title_full_unstemmed | Study on the formation and characteristics of unstable sheet cavitation on hydrofoils |
| title_short | Study on the formation and characteristics of unstable sheet cavitation on hydrofoils |
| title_sort | study on the formation and characteristics of unstable sheet cavitation on hydrofoils |
| topic | Hydrofoil Unstable sheet cavitation Cavitation shedding Re-entrant jet Large eddy simulation |
| url | http://www.sciencedirect.com/science/article/pii/S1350417724003225 |
| work_keys_str_mv | AT linwang studyontheformationandcharacteristicsofunstablesheetcavitationonhydrofoils AT dichen studyontheformationandcharacteristicsofunstablesheetcavitationonhydrofoils AT fangpingtang studyontheformationandcharacteristicsofunstablesheetcavitationonhydrofoils AT haiyuliu studyontheformationandcharacteristicsofunstablesheetcavitationonhydrofoils |