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All Journal International Journal of Renewable Energy Development
Liu Chen
College of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai, 200093
Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering

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Study on the effect of bionic flap based on owl wing contour on aerodynamic noise of airfoil Xian Fan Xie; Liu Chen; Jian Shen Zhu
International Journal of Renewable Energy Development Vol 15, No 4 (2026): July 2026
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2026.62430

Abstract

Modifying flap geometry to reduce trailing-edge turbulence is an effective approach to lower wind-turbine blade aerodynamic noise. Based on the NACA0018 airfoil, a new bionic serrated flap was designed by mimicking the owl wing structure. Numerical methods were employed to investigate its noise reduction mechanism, utilizing Improved Delayed Detached Eddy Simulation (IDDES) and the Ffowcs Williams-Hawkings (FW-H) method. The aerodynamic and aeroacoustic performance of the baseline airfoil, a flat-plate Gurney flap (PGF), a standard serrated flap (SGF), and the bionic flap (BGF) were calculated at different inflow wind speeds (Re = 7×104, 1.4×105 and 2.1×105) under various inflow angles (0°, 6°, 10° and 15°). Numerical results demonstrate that the proposed BGF configuration mitigates the additional noise induced by the traditional Gurney flap, with reductions observed in the overall sound pressure levels across the monitored directivity points. Compared to the baseline airfoil, the BGF demonstrates noise reduction at low angles of attack (AoA < 6°), with a peak OASPL decrease of 4.6 dB. However, this aeroacoustic advantage diminishes rapidly as the AoA exceeds 6°, suggesting that the noise-suppression effectiveness of the bionic contour is highly sensitive to the inflow angle. Analysis of wake vortex structures and turbulence intensity reveals that the curved bionic flap effectively suppresses vortex clusters and turbulence intensity, leading to reduce the airfoil's aerodynamic noise. 
Co-Authors Jian Shen Zhu Xian Fan Xie