NACA0009 Hydrofoil Groove Design for Suppressing TLV and Noise

Abstract

In hydraulic equipment, tip clearance may result in a leakage vortex known as a tip clearance leakage vortex (TLV), which reduces the machinery’s energy efficiency. In order to lessen the damage brought on by tip clearance, this research sets the angle, location, spacing, and depth of the grooves as significant criteria. The orthogonal approach is used to design the hydrofoil’s grooves. Numerous simulations are carried out using the SST k-turbulence model and the wideband noise source model. The results demonstrate how closely the numerical simulation matches what was seen in the experiments. The results demonstrate that grooves are a successful method for lowering TLV when compared to the original hydrofoil. The vortex area of the hydrofoil is reduced by 4.15% under the M5 design compared to the original hydrofoil. The groove significantly alters the dipole noise distribution of the hydrofoil’s leading edge in comparison to the original hydrofoil, resulting in a reduced decibel noise level at the hydrofoil’s tip clearance region. In comparison to the original hydrofoil, the average Curle APL of M5 and M8 decreased by 1.78 and 1.65%, respectively. Due to the way the groove blocks the TLV and muffles the noise it generates, M5 is in the optimum operational condition.