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Aerodynamic Optimization of an UHBR Engine Position on a Short Range Aircraft Configuration at Cruise Flight Conditions

Lange, Fabian (2018) Aerodynamic Optimization of an UHBR Engine Position on a Short Range Aircraft Configuration at Cruise Flight Conditions. AIAA Aviation and Aeronautics Forum and Exposition (AVIATION), 25.-29. Jun. 2018, Atlanta, GA (USA). DOI: 10.2514/6.2018-3811

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Abstract

The trend towards more efficient engines with larger diameters is expected to continue for future commercial transport aircraft. One crucial aspect caused by the increasing engine size is the integration of the engine on the wing. This issue is being investigated in the European Project CleanSky2 within the platform Large Passenger Aircraft (LPA) by combining a conventional single-aisle aircraft with an ultra high-bypass ratio (UHBR) engine (Bypass ratio BPR=15). The work within this project focuses on the low-speed configuration during take-off and especially landing, because the large engine diameter and the close coupling of wing and engine leads to a shortened leading edge device in spanwise direction. This slat cut-back affects the high-lift performance adversely because of the locally missing leading edge device, which is crucial to reach the required lift coefficients. As a consequence, a mitigation needs to be devised to stabilizethe flow on the wing in the wake of the engine and recover the performance loss. A promising option is active flow control (AFC) to suppress a significant flow separation at relevant angles of attack. In order to study the low speed configuration, an optimization was set-up to generatea realistic UHBR single-aisle short-range configuration. Therefore, an optimization of the engine’s position along the wing was accomplished in cruise flight conditions. A subsequent optimization refined the obtained design through a shape adaptation of nacelle and pylon. This paper will cover the engine position optimization. For this purpose, a fully automated process chain including geometry adaptation, mesh generation, CFD calculation and evaluation was established. With the aid of a surrogate based optimizer, a design of experiments (DoE) was performed to investigate the influence of the horizontal distance, vertical distance, pitch and toe-in angle within a defined parameter space. An adaptive sampling approach following the DoE found the optimal engine position for minimum drag at cruise flight conditions.

Item URL in elib:https://elib.dlr.de/123547/
Document Type:Conference or Workshop Item (Speech)
Title:Aerodynamic Optimization of an UHBR Engine Position on a Short Range Aircraft Configuration at Cruise Flight Conditions
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Lange, FabianFabian.Lange (at) dlr.deUNSPECIFIED
Date:June 2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.2514/6.2018-3811
Status:Published
Keywords:UHBR Triebwerksintegration Reiseflug
Event Title:AIAA Aviation and Aeronautics Forum and Exposition (AVIATION)
Event Location:Atlanta, GA (USA)
Event Type:international Conference
Event Dates:25.-29. Jun. 2018
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 - Concepts and Integration
Location: Braunschweig
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Transport Aircraft
Deposited By: Lange, Fabian
Deposited On:12 Dec 2018 09:57
Last Modified:12 Dec 2018 09:57

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