Numerical analysis of high-lift configurations with oscillating flaps

This study presents two-dimensional aerodynamic investigations of various high-lift configuration settings concerning the deflection angles of droop nose, spoiler and flap in the context of enhancing the high-lift performance by dynamic flap movement. The investigations highlight the impact of a periodically oscillating trailing edge flap on lift, drag and flow separation of the high-lift configuration by numerical simulations. The computations are conducted with regard to the variation of the parameters reduced frequency and the position of the rotational axis. The numerical flow simulations are conducted on a block-structured grid using Reynolds Averaged Navier Stokes simulations employing the shear stress transport k- ω turbulence model. The feature Dynamic Mesh Motion implements the motion of the oscillating flap. Regarding low-speed wind tunnel testing for a Reynolds number of 0.5 × 10 6 the flap movement around a dropped hinge point, which is located outside the flap, offers benefits with regard to additional lift and delayed flow separation at the flap compared to a flap movement around a hinge point, which is located at 15 % of the flap chord length. Flow separation can be suppressed beyond the maximum static flap deflection angle. By means of an oscillating flap around the dropped hinge point, it is possible to reattach a separated flow at the flap and to keep it attached further on. For a Reynolds number of 20 × 10 6, reflecting full scale flight conditions, additional lift is generated for both rotational axis positions. © 2021, The Author(s).     «

This study presents two-dimensional aerodynamic investigations of various high-lift configuration settings concerning the deflection angles of droop nose, spoiler and flap in the context of enhancing the high-lift performance by dynamic flap movement. The investigations highlight the impact of a periodically oscillating trailing edge flap on lift, drag and flow separation of the high-lift configuration by numerical simulations. The computations are conducted with regard to the variation of the p...     »

The funding of this investigation within the LUFO V3 project BIMOD (Influencing maximum lift and wake vortex instabilities by dynamic flap movement) (FKZ: 20E1702C) by the German Federal Ministry for Economic Affairs and Energy (BMWi), is gratefully acknowledged. Special thanks are addressed to ANSYS for providing the flow simulation software. Moreover, the authors gratefully acknowledge the Gauss Centre for Supercomputing e.V. ( www.gauss-centre.eu ) for funding this project by providing computing time on the GCS Supercomputer SuperMUC-NG at Leibniz Supercomputing Center (LRZ, www.lrz.de ). I would also like to thank the students Valentin Elender and Christian Mehringer.     «

The funding of this investigation within the LUFO V3 project BIMOD (Influencing maximum lift and wake vortex instabilities by dynamic flap movement) (FKZ: 20E1702C) by the German Federal Ministry for Economic Affairs and Energy (BMWi), is gratefully acknowledged. Special thanks are addressed to ANSYS for providing the flow simulation software. Moreover, the authors gratefully acknowledge the Gauss Centre for Supercomputing e.V. ( www.gauss-centre.eu ) for funding this project by providing comput...     »