The effect of leading-edge droop on the performance of cavitating hydrofoil in an oscillating environment

Abstract

The hydrodynamics of cavitating hydrofoil in oscillating motion are important in the aspect of the performance and hydro-elasticity of the control surface of the ship. The effect of leading-edge droop is numerically studied in the oscillating hydrofoil with cavitation. A two-phase incompressible Navier—Stokes solver is used to compute the cavitation flow. The hydrodynamic performance of the baseline hydrofoil is compared with that of the fixed droop and the variable droop hydrofoil. The droop models delay the separation behind the sheet cavitation near the maximum angle of attack. When the pitch goes down, the drooped models suppress the collapse of the sheet cavitation. Therefore, they result in the improved hydrodynamic performance against the baseline model through the oscillation cycle. Among the three hydrofoils, the variable droop showed the smallest change of the lift-to-drag ratio.

Study on Cascade Density of the Impeller Based on Response Surface Analysis

“…Liu et al [8] investigated the influence of the cavitation behavior response of three composite hydrofoils of carbon-fiber reinforced plastic with different ply angles. Park et al [9] studied the effect of leading-edge droop in the oscillating hydrofoil with cavitation numerically, and compared the hydrodynamic performance of the baseline hydrofoil with that of the fixed droop and the variable droop hydrofoil. Conesa et al [10] studied the effectiveness of a slotted hydrofoil in minimizing the cavitation phenomenon, to improve the overall water take-off performance of an amphibious aircraft, and performed a multi-objective optimization with a response surface model to simultaneously minimize the cavitation and maximize the hydrodynamic efficiency of the hydrofoil.…”