This article describes work in the DLR High Performance Flexible Aircraft (HighPerFlex) project to investigate mini trailing edge devices for adaptive load redistribution. The EU project AWIATOR showed the potential of mini-TEDs (Trailing Edge Devices), but the increased rear wing loading and resulting nose-down pitching moment require further investigation. 2-D computations were carried out to investigate effective split-flap deployment angles. The calculations show that the optimal height of a mini-TED on an unknown profile in transonic flow cannot be predicted by scaling with the boundary layer thickness on the pressure-side trailing edge. The scope of the future work on structure-coupled 3-D computations on a trimmed aircraft is described. The initial investigations into the use of mini- TEDs for load-redistribution on an A340-300 have been completed. The use of 2-D computations on wing slices has shown that mini- TED angles of under 10 degrees are likely to be most desirable, although the comparison with 3-D computations underlines the highly three-dimensional nature of the flow over the wing. Addition of mini-TEDs to the three-dimensional geometry show that the reduction in aircraft pitch to maintain flight at constant lift coefficient leads to a change in wing loading. The consequent superposition of wing loadings due to the mini- TED and due to the change in pitch can provide changes in pitching moment which are in the opposite direction to those predicted by simple 2-D computations. Due to the unintuitive reaction of the 3-D geometry to changes, further computations with a trimmed aircraft and structurecoupling are expected to deliver particularly interesting results. An appropriate structural model and aerodynamic grids for fluid-structure coupling have been developed, and the method of coupling has been demonstrated in principle. The aeroelastic computations will be performed once the tool for automatic aircraft trimming is finished.
Adaptive load redistribution using mini-TEDs
Adaptive Lastumverteilung mit Hilfe von Mini-Tragflügelhinterkantenspreizklappen
2006
10 Seiten, 8 Bilder, 4 Tabellen, 15 Quellen
Conference paper
English
ADAPTIVE LOAD REDISTRIBUTION USING MINI-TEDS
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