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Drag reduction of a transport helicopter by application of an adjoint-based fuselage optimization chain and modification of the rotor head

Wentrup, Marc and Khier, Walid and Zhang, Qinyin (2014) Drag reduction of a transport helicopter by application of an adjoint-based fuselage optimization chain and modification of the rotor head. Greener Aviation:Clean Sky breakthroughs and worldwide status, 12-14 März 2014, Belgien.

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Official URL: http://www.greener-aviation2014.com/

Abstract

In this paper two approaches are investigated to reduce the parasite drag of a helicopter. The first approach is to optimize the surface of the fuselage back door. This is done by applying an automatic, adjoint-based optimization chain; developed by DLR for these purposes. This optimization chain combines the RANS-solver TAU with a solver for the discrete adjoint equation and a conjugate-gradient based optimization algorithm. The parameterization is done by Free Form Deformation. A description of the functionality of the chain is given, before the results of the optimization run are presented. The resulting surfaces were able to bring benefits, up to 3.75% drag reduction compared to the baseline geometry. The second approach is to reduce the main rotor head drag, by installing a hub fairing. During this investigation, two different hub geometries were tested. By using a fully closed fairing, a drag reduction of about 19% could be achieved.

Item URL in elib:https://elib.dlr.de/92943/
Document Type:Conference or Workshop Item (Speech)
Title:Drag reduction of a transport helicopter by application of an adjoint-based fuselage optimization chain and modification of the rotor head
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wentrup, Marcmarc.wentrup (at) dlr.deUNSPECIFIED
Khier, Walidwalid.khier (at) dlr.deUNSPECIFIED
Zhang, Qinyinqinyin.zhang (at) eurocopter.comUNSPECIFIED
Date:March 2014
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:adjoint; optimisation; gradient
Event Title:Greener Aviation:Clean Sky breakthroughs and worldwide status
Event Location:Belgien
Event Type:international Conference
Event Dates:12-14 März 2014
Organizer:3AF
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:rotorcraft
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Virtual Aerodynamic Rotorcraft
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Deposited By: Wentrup, Marc
Deposited On:03 Dec 2014 14:32
Last Modified:31 Jul 2019 19:50

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