LAUSR

Abstract In this paper, results of a study of a submerged hydrofoil with a custom-designed internal slot are provided. The performance characteristics of the slotted hydrofoil in the presence of the free surface are investigated both numerically and experimentally, with angles of attack ranging from 0 ° ≤ AoA ≤ 30 ° at a Reynolds number of 105. Lift and drag coefficients of the slotted hydrofoil with submergence depth of one chord length determined from the computational fluid dynamics study correlate well with the corresponding experimentally determined coefficients. Results suggest significant improvements in hydrofoil performance in terms of lift, drag, and lift-to-drag ratio at high angles of attack. By comparing experimental results of slotted hydrofoils operating at different submergence depths, the submergence depth for good performance of the slotted hydrofoil was determined.