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Approach for Aerodynamic Gust Load Alleviation by Means of Spanwise-Segmented Flaps

Ullah, Junaid and Lutz, Thorsten and Klug, Lorenz and Radespiel, Rolf and Heinrich, Ralf and Wild, Jochen (2023) Approach for Aerodynamic Gust Load Alleviation by Means of Spanwise-Segmented Flaps. Journal of Aircraft, 60 (3), pp. 835-856. American Institute of Aeronautics and Astronautics (AIAA). doi: 10.2514/1.C037086. ISSN 0021-8669.

[img] PDF - Preprint version (submitted draft)

Official URL: https://arc.aiaa.org/doi/10.2514/1.C037086


Active gust load alleviation techniques exhibit a high potential in significantly reducing the transient gust loads on aircraft. In this work the aerodynamic potential of trailing-edge flaps and leading-edge flaps is numerically studied with the purpose to significantly reduce the structural gust loads. The utilized spanwise-segmented flaps represent slight modifications of existing devices for high-lift and maneuvering. The investigations based on unsteady Reynolds-averaged Navier-Stokes computations are conducted by employing a generic wing-fuselage aircraft configuration at transonic flow conditions. Idealized discrete "1-cos"-type vertical gusts that are relevant for the certification process are used as representative atmospheric disturbances. The focus of this paper is to introduce a practicable prediction method for required trailing- and leading-edge flap deflections for a significant mitigation of gust-induced wing loads. The three-dimensional flap deflections are determined by parametric two-dimensional simulations at representative wing sections. Different extensions of the estimation approach are investigated to assess the influence of the wing planform, the finite wing span, the aerodynamic phase lags, and the flap scheduling. It is shown that the trailing- and leading-edge flaps are promising in terms of alleviation of gust-induced wing bending and wing torsional moments, respectively. However, at high leading-edge flap deflections that are necessary for a full compensation of the wing torsional moment large-scale flow separation is identified. The introduced gust load alleviation approach indicates a good transferability between two-dimensional airfoil and three-dimensional wing aerodynamics for unsteady flap deflections.

Item URL in elib:https://elib.dlr.de/195278/
Document Type:Article
Title:Approach for Aerodynamic Gust Load Alleviation by Means of Spanwise-Segmented Flaps
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Ullah, JunaidUniversität StuttgartUNSPECIFIEDUNSPECIFIED
Wild, JochenUNSPECIFIEDhttps://orcid.org/0000-0002-2303-3214UNSPECIFIED
Date:31 January 2023
Journal or Publication Title:Journal of Aircraft
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 835-856
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
Keywords:Aircraft, Aerodynamics, Gust, Load Alleviation, Flaps
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Efficient Vehicle
DLR - Research area:Aeronautics
DLR - Program:L EV - Efficient Vehicle
DLR - Research theme (Project):L - Virtual Aircraft and  Validation
Location: Braunschweig
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > CASE, BS
Institute for Aerodynamics and Flow Technology > Transport Aircraft
Deposited By: Wild, Dr.-Ing. Jochen
Deposited On:19 Sep 2023 10:45
Last Modified:21 Sep 2023 07:47

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