Open AccessUnsteady cavities near the hydrofoil with a small aspect ratio
Author(s) -
Sergey Skripkin,
M. A. Tsoy,
A. Yu. Kravtsova
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2057/1/012033
Subject(s) - strouhal number , dimensionless quantity , flow visualization , cavitation , mechanics , instability , aspect ratio (aeronautics) , physics , acoustics , leading edge , flow (mathematics) , range (aeronautics) , water tunnel , reynolds number , optics , materials science , vortex , turbulence , optoelectronics , composite material
Using digital processing of high-speed visualization data on a cavitation flow near NACA hydrofoil with critically low aspect ratio, the frequencies of the formation and separation of cavities in the flow are identified. It is shown that in the case of development of cloud cavitation the main dimensionless frequency varies within 0.4, which corresponds to the type of internal instability. The Strouhal number corresponds to the frequency of attached cavity occurrence and varies in range from 0.6 to 0.8. The Strouhal numbers calculated in third mode exceed 1. This mode corresponds to the forming of very small cavities near the leading edge of hydrofoil.