- 期刊
- OpenAccess
Numerical Investigation of the Flow around a Multi-Element Airfoil near a Moving Wavy Wall
摘要
A comprehensive investigation of the unsteady flow dynamics around the 30P30N multi-element airfoil is conducted across a range of slat and flap angles of attack (AoA = 0° - 30°) and a Reynolds number of 1.7 × 10^6 and a Mach number of 0.07 with wall proximity ratios h/c = 0.25 - 1.0 (where h denotes the vertical distance between the leading edge of the main part of the airfoil and the wavy wall's neutral line, and c is the airfoil chord length). By employing the unsteady Reynolds-Averaged Navier-Stokes equations with the k-ε turbulent model, solved via the finite volume method in ANSYS Fluent, this study examines the influence of wavy wall proximity, slat's and flap's AoA on aerodynamic coefficients, velocity and pressure distributions, and turbulent kinetic energy field. The analysis reveals that the lift and drag coefficients exhibit significant sensitivity to the slat's and flap's AoA. As the airfoil approaches the wavy wall, the aerodynamic behavior parallels that observed near a flat wall but with markedly greater intensity. Most notably, the aerodynamic efficiency at h/c = 0.25 (Cl/Cd = 700) is enhanced by over tenfold compared to h/c = 0.5 - 1.0 (Cl/Cd = 28 - 42) when slat's AoA = 0° and flap's AoA = 30°. These findings underscore the substantial impact of wavy wall proximity on airfoil performance, offering valuable insights into ground effects for practical scenarios involving non-uniform runways and advanced airfoil designs.