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Active Gust Load Alleviation by Combined Actuation of Trailing Edge and Leading Edge Flap at Transonic Speeds

Ullah, Junaid and Lutz, Thorsten and Klug, Lorenz and Radespiel, Rolf and Wild, Jochen (2021) Active Gust Load Alleviation by Combined Actuation of Trailing Edge and Leading Edge Flap at Transonic Speeds. In: AIAA Scitech 2021 Forum. AIAA Scitech 2021 Forum, 11.-21.Jan 2021, VIRTUAL EVENT. doi: 10.2514/6.2021-1831.

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Official URL: https://arc.aiaa.org/doi/abs/10.2514/6.2021-1831

Abstract

Gust load analysis plays a substantial role in the certification process of aircraft. Active gust load alleviation techniques exhibit a high potential in significantly reducing the transient gust loads and thus the overall structural weight. In this paper, two dynamic actuator concepts are studied by means of CFD methods on a generic wing-fuselage aircraft configuration. The concepts comprise spanwise segmented trailing edge flaps (TEF) and leading edge flaps (LEF), which are already existent on the research model for high-lift and maneuvering purposes. Simulations based on Euler and RANS equations are utilized to assess the aerodynamic potential of the actuators regarding alleviation of critical idealized "1-cos" type vertical gusts. 2D simulations of a representative wing section are considered in an extended parametric study to derive an initial guess for the required actuation deflections on the aircraft configuration. An iterative analysis of spanwise varying actuator amplitudes is conducted in order to obtain strong control authority over the wing bending moment (WBM) and wing torsional moment (WTM). It is shown that the TEFs are promising in terms of mitigation of gust induced WBM and the LEFs are able to compensate the WTM induced by the deflected TEFs. Unsteady phenomena are identified at large TEF deflections resulting in unfavorable response of the aircraft. The transient behavior of the force coefficients shows significant dependencies on the flap scheduling. Only small improvements are achieved through segmented flap actuation compared to continuous flap actuation for the limited investigated setups.

Item URL in elib:https://elib.dlr.de/140190/
Document Type:Conference or Workshop Item (Speech)
Title:Active Gust Load Alleviation by Combined Actuation of Trailing Edge and Leading Edge Flap at Transonic Speeds
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Ullah, JunaidUniversität StuttgartUNSPECIFIED
Lutz, ThorstenIAG - University of StuttgartUNSPECIFIED
Klug, LorenzTU BraunschweigUNSPECIFIED
Radespiel, RolfTechnische Universität Braunschweig, Institut für StrömungsmechanikUNSPECIFIED
Wild, JochenJochen.Wild (at) dlr.dehttps://orcid.org/0000-0002-2303-3214
Date:January 2021
Journal or Publication Title:AIAA Scitech 2021 Forum
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.2514/6.2021-1831
Status:Published
Keywords:Aerodynamics, Load Alleviation, Gust Loads
Event Title:AIAA Scitech 2021 Forum
Event Location:VIRTUAL EVENT
Event Type:international Conference
Event Dates:11.-21.Jan 2021
Organizer:AIAA
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics (old)
Location: Braunschweig
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Transport Aircraft
Deposited By: Wild, Dr.-Ing. Jochen
Deposited On:11 Jan 2021 07:24
Last Modified:11 Jan 2021 07:24

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