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- W4221099948 abstract "In recent years, leading-edge tubercles of humpback whales have received increasing attention as a passive stall control mechanism. The control mechanism and flow field structure of a reference (ref) and two modified airfoils (mod-1 and mod-2) are investigated numerically and experimentally at a Reynolds number of Re = 5 × 105 in this paper. The results demonstrate that the lift coefficient of the modified airfoils is enhanced to a certain extent after these airfoils stall. In addition, the stall processes of mod-2 are smooth and stable over the observed sudden decrease in ref. Counter-rotation vortex pairs (CRVPs), which improves momentum exchange in the trailing edge boundary layer on the suction side, according to streamline slices and iso-surfaces of the vorticity. Moreover, interaction between streamwise vortices is the main reason for the improved hydrodynamic characteristics at high angles of attack (AOAs). Furthermore, when smoke visualization is carried out in a low-Re wind tunnel, mod-1 and mod-2 exhibit similar characteristics, vortex pairs are periodic and symmetric along the wingspan direction at α = 5°, and vortex pairs begin to interact and influence flow separation at α = 15°. Finally, numerical analysis of the characteristics of tubercle turbines is conducted. The findings reveal that the energy efficiency can be enhanced within a narrow range of tip speed ratios (TSRs)." @default.
- W4221099948 created "2022-04-03" @default.
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- W4221099948 date "2022-05-01" @default.
- W4221099948 modified "2023-09-29" @default.
- W4221099948 title "Numerical and experimental study on flow separation control of airfoils with various leading-edge tubercles" @default.
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- W4221099948 doi "https://doi.org/10.1016/j.oceaneng.2022.111046" @default.
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