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A Numerical Optimization Framework for Rotor Airfoil Design

Wilke, Gunther Andreas (2022) A Numerical Optimization Framework for Rotor Airfoil Design. In: 48th European Rotorcraft Forum. 48th European Rotorcraft Forum, 06-09 Sep 2022, Winterthur, Switzerland.

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The design of new helicopter airfoils is a challenging task. The individual blade sections undergo very different flow conditions during the various flight regimes of the helicopter. In forward flight, the advancing side operates in a transonic regime where potentially shock waves can occur, while on the retreating side little flow velocities at high angle of attacks are seen up to reverse flow. In hover, the oncoming tip vortex of the previous blade drastically influences the inflow on the rotor. Therefore, after a brief review of given design techniques, a novel approach for airfoil designs is put forward. A surrogate based multi-objective approach including constraints is utilized to concurrently optimize an airfoil for hover, retreating and advancing side flow, while also enforcing a certain robustness as to not looking at single design points in these global flow regimes. Along with the estimation of design targets, this 2D flow analysis-based framework allowed to optimize the airfoil design of an existing model rotor blade. A comparison over a range of flight conditions of the rotor with and without the new airfoils proved the validity of this approach.

Item URL in elib:https://elib.dlr.de/188311/
Document Type:Conference or Workshop Item (Lecture)
Additional Information:Part of DLR's UrbanRescue Project
Title:A Numerical Optimization Framework for Rotor Airfoil Design
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Wilke, Gunther AndreasUNSPECIFIEDhttps://orcid.org/0000-0002-1915-5307UNSPECIFIED
Date:6 September 2022
Journal or Publication Title:48th European Rotorcraft Forum
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:robust airfoil design, NACA23012, HART-II, OA209, multi-objective surrogate-based optimization
Event Title:48th European Rotorcraft Forum
Event Location:Winterthur, Switzerland
Event Type:international Conference
Event Dates:06-09 Sep 2022
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 Rotorcraft and Validation
Location: Braunschweig
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Helicopter, BS
Deposited By: Wilke, Gunther Andreas
Deposited On:04 Nov 2022 09:26
Last Modified:07 Nov 2022 10:43

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