Suppression of hydrofoil unsteady cavitation by periodic jets based on fish gill respiration

Abstract

Cavitation is a phase change phenomenon that occurs between the liquid and vapour phases inside a homogeneous liquid or at the interface between a solid and a liquid, and the generation, collapse and shedding of cavitation are the sources of undesirable characteristics of fluid machinery. A periodic jet scheme based on the principle of bionics is designed and applied to a Clark-Y hydrofoil with a chord length of 70 mm to suppress the cavitation of fluid machinery under high-speed flow conditions. Different schemes are numerically simulated using large eddy simulation combined with the Zwart–Gerber–Belamri cavitation model to numerically simulate the different schemes. The results show that adding periodic jet to the hydrofoil can reduce the cavitation of the hydrofoil without losing the lift resistance of the hydrofoil, and the cavitation volume is 47%–52% of the original hydrofoil.