Assessment of the efficiency of an active winglet concept for a long-range aircraft
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ORIGINAL PAPER
Assessment of the efficiency of an active winglet concept for a long‑range aircraft Martin Delavenne1 · Bernard Barriety1 · Fabio Vetrano1 · Valérie Ferrand2 · Michel Salaun3 Received: 17 February 2020 / Revised: 25 June 2020 / Accepted: 19 August 2020 © Deutsches Zentrum für Luft- und Raumfahrt e.V. 2020
Abstract This paper presents the analysis of an active winglet concept applied to a long-range aircraft. The winglet is actuated along the longitudinal axis to control its cant angle. Due to aeroelastic effects, the wing twist changes and therefore impacts aircraft performance. As a consequence, this technology offers the opportunity to optimize aircraft performance throughout the flight. This ability will be evaluated using high-fidelity coupled aerodynamic and structural computations. The consideration of the wing flexibility and the impact of the winglet on the wing shape contributes to more accurate aerodynamic predictions. First, the winglet geometry is optimized for the cruise condition using surrogate models. The designed winglet reduces the drag with a limited impact on loads while ensuring the capability to change the wing tip twist through the control of the cant angle. Then, a mission analysis is performed to assess the benefits of the technology on a variety of flight conditions. Keywords Active winglet · Surrogate-based optimization · CFD/CSM · Aerodynamic performances
1 Introduction The “flygskam” movement (flight shame) initiated in the Scandinavian countries has a growing influence around the world. It particularly highlights the increasing concern of the population for climate change issues and the impacts of human activities on the environment. It also puts pressure on aircraft designers to propose greener products to maintain their competitiveness. Even if fuel consumption has always been a concern of the industry, the traditional design approach was mainly focused on the optimization of the aircraft for a particular cruise condition representative of a typical mission. However, depending on weather conditions, air traffic control regulations and operational constraints, an airline may not operate the product at this optimal design point, leading to fuel waste. Today, under the popular pressure and considering the rarefaction of raw
* Martin Delavenne [email protected] 1
Airbus Operations SAS, 316 Route de Bayonne, 31066 Toulouse, France
2
ISAE-SUPAERO, Université de Toulouse, Toulouse, France
3
ICA, Université de Toulouse, ISAE-SUPAERO, MINES ALBI, UPS, INSA, CNRS, Toulouse, France
materials, oil in particular, this legacy approach must be challenged and new technical solutions must be found. In contrast to the current aircraft designs that are only able to adapt to some very specific configurations, such as takeoff and landing, morphing approaches propose to adapt the shape of the vehicle continuously during the flight. The reference [1] presents different morphing technologies mainly focused on the wings shapes adaptation. In [2] a classification
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