Parametric Analysis and Cloud Cavitation Suppression Mechanism of Groove Structures on NACA۰۰۱۵ Hydrofoil

Cloud cavitation, characterized by strong unsteadiness, is a major cause of hydrofoil surface erosion. However, existing studies on grooved anti-cavitation structures have mainly focused on single geometric configurations, and the effects of key design parameters remain insufficiently understood. This study aims to clarify the modulation mechanism of grooved structures on cloud cavitation and identify the optimal parameter combination for NACA۰۰۱۵ hydrofoils. Transient numerical simulations were conducted under typical cloud cavitation conditions (σ = ۰.۸) using a modified Shear Stress Transport (SST) k-ω turbulence model coupled with the Zwart-Gerber-Belamri (Z-G-B) cavitation model. The effects of groove radius R, groove number z, and chordwise position L on cavitation characteristics and hydrodynamic performance were systematically investigated using the control variable method. The results show that grooved structures suppress cloud cavitation by regulating near-wall flow, blocking re-entrant jet propagation, reconstructing local pressure fields, and reducing turbulent kinetic energy dissipation. Within the tested parameter range, the optimal parameter combination is R = ۷۰ mm, z = ۲۵, and L = ۰.۳ c, which reduces the time-averaged cavitation volume by ۵۲.۱۲% and the dominant flow-induced vibration amplitude by ۳۳.۴%. This study provides theoretical guidance for the anti-cavitation design of hydraulic machinery blades.

کلیدواژه ها:

Cloud cavitation ، Cavitation inhibition ، Groove structure ، Numerical simulation ، NACA۰۰۱۵ Hydrofoil