Tonal Noise Control Versus Performances on NACA0015 Hydrofoil

Abstract

Strong correlation between boundary layer excitation and hydrofoil eigenmode occurs for specific angles of attack and Reynolds numbers, resulting in strong tonal noise emissions under certain circumstances. This study aims to analyze the performance of vibration control methods such as truncated trailing edge or boundary layer triggering. The study explores the conditions for hydro elastic trailing edge vibrations on a hydrofoil clamped in a hydrodynamic tunnel, with tests performed for Reynolds numbers up to 1.2 × 10⁶ and various angles of attack up to 10°. Experiments were conducted on a clamped 0.1 m chord NACA0015 aluminum hydrofoil, with measurements taken for both vibrations and hydrodynamic components such as lift, drag, and moment. The goal of the study is to closely understand the impact of vibration control on hydrofoil efficiency. This could be very beneficial for those who are working on optimizing profile design. The study first presents the experimental setup, followed by an analysis of the hydrofoil’s vibratory response and a presentation of the effectiveness of control solutions. Then, the performance of these solutions is discussed followed by a conclusion.