Numerical study of airfoil with wavy leading edge at high Reynolds number regime

Abstract

In this work, a numerical study of flow around an airfoil with wavy leading edge is presented at a Reynolds number of 3X106. The flow is resolved by considering the RANS (Reynolds Average Navier-Stokes)equations. The baseline geometry is based on the NACA 0021 profile. The wavy leading edge has an amplitude of 3% and wavelength of 11%, both with respect to the airfoil chord. Cases without and with wavy leadingedges are simulated and compared. Initially, studies of the numerical sensitivity with respect to the obtained results, considering aspects such as turbulence modeling and mesh refinement, are carried out as well as bycomparison with corresponding results in the literature. Numerical data such as pressure distribution, shear stress lines on the wing surface, and aerodynamics coefficients are used to describe and investigate the flowfeatures around the wavy leading airfoil. Comparisons between the straight leading edge and the wavy leading edge cases shows an increase of the maximum lift coefficient as well as stall angle for the wavy leading edge configuration. In addition, at an angle of attack near the stall, the present numerical results shows an increase of the drag coefficient with the wavy leading edge airfoil when compared with the corresponding straight leading edge case.

Influence of Bionic Waveform Leading Edge Blade on Drag Reduction Characteristics of Mixed Pump

“…Based on the profile of the NACA 0021 airfoil with wavy leading edge modification, Fonseca et al studied the flow around the airfoil at Reynolds number 3×10 6 numerically. The research results showed that the maximum lift coefficient and the stall angle of the wave leading edge increase and the drag coefficient of the wave leading edge airfoil is higher than that of the straight leading edge airfoil, when the angle of attack is close to the stall angle (Fonseca et al 2020).…”