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Evaluation of Formation Flights with Long Range Aircraft for Different Flight Conditions and Atmospheric Disturbances

Zumegen, Clemens and Marks, Tobias and Stumpf, Eike (2022) Evaluation of Formation Flights with Long Range Aircraft for Different Flight Conditions and Atmospheric Disturbances. Deutscher Luft- und Raumfahrkongress 2020, 01.-03. Sep. 2022, Online. doi: 10.25967/530159.

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The aerodynamic formation flight, which is also called air wake surfing for efficiency (AWSE), can lead to a high drag reduction at the trailing aircraft of more than ten percent resulting in a reduced fuel burn. Therefore, this operational strategy represents a promising means to reduce the greenhouse effect of aviation. The following study investigates the flight of two long haul commercial aircraft in an echelon formation in a stationary state, a flight dynamic simulation and finally at trajectory level. Thereby, the effect of different cruise altitudes and speeds, aircraft masses, lateral and vertical separations and different intensities of gusts and turbulence are evaluated. Based on the aircraft data set from the in house preliminary aircraft design tool MICADO a vortex lattice method calculates the induced loads in the trailing wake behind the leader. Subsequently, the results are used in the flight simulation program to analyze the flight behavior of the trailing aircraft in the formation under the influence of atmospheric disturbances. Finally, the results of the vortex lattice method and the flight simulation provide the necessary input data for the evaluation of the benefits achievable during the entire mission based on a detailed trajectory calculation. High altitudes and low Mach numbers during the formation flight lead to the highest drag reductions at the trailing aircraft. Movements of the trailing aircraft away from the optimum location in the vortex of the leading aircraft and additional detours lead to reduced fuel savings of ten percent or less.

Item URL in elib:https://elib.dlr.de/188762/
Document Type:Conference or Workshop Item (Speech)
Title:Evaluation of Formation Flights with Long Range Aircraft for Different Flight Conditions and Atmospheric Disturbances
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Marks, TobiasUNSPECIFIEDhttps://orcid.org/0000-0002-4225-5672UNSPECIFIED
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:formation flight, wake energy retrieval, wake surfing, atmospheric disturbances
Event Title:Deutscher Luft- und Raumfahrkongress 2020
Event Location:Online
Event Type:national Conference
Event Dates:01.-03. Sep. 2022
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Air Transportation and Impact
DLR - Research area:Aeronautics
DLR - Program:L AI - Air Transportation and Impact
DLR - Research theme (Project):L - Climate, Weather and Environment
Location: Hamburg
Institutes and Institutions:Air Transport Operations > Air Transport Infrastructures & Processes
Deposited By: Marks, Dr.-Ing. Tobias
Deposited On:25 Nov 2022 09:24
Last Modified:25 Nov 2022 09:24

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