Martin Delavenne, Bernard Barriety, Fabio Vetrano, Valerie Ferrand, Michel Salaun

DOI Number: N/A

Conference number: IFASD-2019-098

Since the pioneering work by Whitcomb [1] in the mid-70’s winglets have demonstrated their capabilities to improve aircraft efficiency. However, they are fixed devices and optimized for certain flight conditions. This paper investigates the opportunity to make these wing extensions active to control aircraft performances along the flight. To assess the efficiency of such a technology, high-fidelity computations coupling aerodynamics and structural mechanics disciplines are used. Surrogate models are built to speed-up the optimization process. Multiobjective and gradient-free algorithms are used to search the optimal winglet shape in cruise condition and the optimal winglet deflection along the mission with block fuel minimization as objective. The capability of active winglets to control the wing shape and particularly the twist is demonstrated. It is also highlighted that the wing flexibility is a key driver of the efficiency of active winglets and must be considered to assess the performances of morphing devices. This document shows that depending on the baseline choice the gains can be quadrupled if the stiffness is neglected.

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In Categories: Aeroelastic Design Applications, IFASD 2019
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