The current work numerically investigated the cloud cavitation around the hydrofoil with leading-edge tubercles, aiming to determine the dynamic characteristics of the bubble cluster and induced vortices. Also, comparisons between the baseline and modified hydrofoils were made to determine the influence of leading-edge tubercles on the partial cavity oscillation. The results show that the lift-to-drag ratio of the bionic hydrofoil is improved by 6.60% though the force coefficients are reduced. The instability mechanisms associated with cloud cavitation around two hydrofoils are different. Specifically, the re-entrant jet and a pair of streamwise vorticity are the reasons for the bubble instability around the baseline and bionic hydrofoils, respectively. Although the bionic hydrofoil is symmetry, both bubbles and vortices distribute in an asymmetry manner. Therefore, the proper orthogonal decomposition modes of the pressure field around two hydrofoils are different but closely coherent with the development of vortices.
INFLUENCES OF BIO-INSPIRED LEADING-EDGE TUBERCLE ON CLOUD CAVITATION AROUND NACA 0009 HYDROFOIL
Pavesi G.
Conceptualization
;
2023
Abstract
The current work numerically investigated the cloud cavitation around the hydrofoil with leading-edge tubercles, aiming to determine the dynamic characteristics of the bubble cluster and induced vortices. Also, comparisons between the baseline and modified hydrofoils were made to determine the influence of leading-edge tubercles on the partial cavity oscillation. The results show that the lift-to-drag ratio of the bionic hydrofoil is improved by 6.60% though the force coefficients are reduced. The instability mechanisms associated with cloud cavitation around two hydrofoils are different. Specifically, the re-entrant jet and a pair of streamwise vorticity are the reasons for the bubble instability around the baseline and bionic hydrofoils, respectively. Although the bionic hydrofoil is symmetry, both bubbles and vortices distribute in an asymmetry manner. Therefore, the proper orthogonal decomposition modes of the pressure field around two hydrofoils are different but closely coherent with the development of vortices.
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