Low-drag high-lift system design using a viscous flow solution based manual design procedure

Kurzfassung

Within the EC project EPISTLE the focus is on low-speed noise reduction by aerodynamic means. The objective of this project is to enable low-noise low speed operation of SCT configurations by developing and validating a new aerodynamic design methodology for low-drag high-lift systems. Instead designing for attached flow, as planned, all partners are faced with partially separated flow to enable the EPISTLE wing to produce the needed lift of CL=0.4. DLR`s tried a viscous flow computation driven manual design. Fast overall turnaround time mesh generation and flow computation enables this. This final DLR design heavily relies on partially separated flow due to the vortices trapped on the deflected LE-flaps of the inner and outer wing. The design is conducted using the algebraic Baldwin-Lomax turbulence model. A confirmation of this flow topology and the associated performance increases is obtained by re-computing this flow using the k-w turbulence model. The EPISTLE experiments of the DLR design fully confirm the designed separated flow topology as well as the numerically predicted drag reduction of this new low-drag high-lift system.