Preprint Article Version 1 This version is not peer-reviewed

Variable Cant Angle Winglets for Improvement of Aircraft Flight Performance

Version 1 : Received: 28 June 2019 / Approved: 1 July 2019 / Online: 1 July 2019 (11:02:29 CEST)

How to cite: Guerrero, J.; Wittkowski, K.; Sanguineti, M. Variable Cant Angle Winglets for Improvement of Aircraft Flight Performance. Preprints 2019, 2019070001 (doi: 10.20944/preprints201907.0001.v1). Guerrero, J.; Wittkowski, K.; Sanguineti, M. Variable Cant Angle Winglets for Improvement of Aircraft Flight Performance. Preprints 2019, 2019070001 (doi: 10.20944/preprints201907.0001.v1).

Abstract

Traditional winglets are designed as fixed devices attached at the tips of the wings. The primary purpose of the winglets is to reduce the lift-induced drag, therefore improving aircraft performance and fuel efficiency. However, because winglets are fixed surfaces, they cannot be used to control lift-induced drag reductions or to obtain the largest lift-induced drag reductions at different flight conditions (take-off, climb, cruise, loitering, descent, approach, landing, and so on). In this work, we propose the use of variable cant angle winglets which could potentially allow aircraft to get the best all-around performance (in terms of lift-induced drag reduction), at different flight phases. By using computational fluid dynamics, we study the influence of the winglet cant angle and sweep angle on the performance of a benchmark wing at Mach numbers of 0.3 and 0.8395. The results obtained demonstrate that by adjusting the cant angle, the aerodynamic performance can be improved at different flight conditions.

Subject Areas

Variable cant angle; Winglets; Drag reduction; Lift-induced drag; CFD

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