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JAXA-ONERA-DLR cooperation: results from rotor optimization in hover

Wilke, Gunther Andreas and Bailly, Joelle and Kimura, Keita and Tanabe, Yasutada (2022) JAXA-ONERA-DLR cooperation: results from rotor optimization in hover. CEAS Aeronautical Journal, pp. 1-21. Springer. doi: 10.1007/s13272-022-00580-8. ISSN 1869-5582.

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Official URL: https://rdcu.be/cMciI


A cooperation between JAXA, ONERA and DLR puts the focus on the aerodynamic optimization of helicopter rotors. This paper represents the conclusions from the first phase: optimization of a hovering rotor. The HART-II blade is first investigated with low-fidelity tools and compared against state-of-the art CFD simulations. Afterwards, the chord distribution and twist of the HART-II blade are optimized using the low-fidelity tools as well as CFD. Since the partners observed differences in the outcome of the CFD simulations for the low-fidelity optimized blades, a deeper investigation of the effects of the turbulence modelling approach, elasticity and grid topology is conducted. The findings show that the chosen flight condition is close to the thrust of the maximum Figure of Merit and that the vortex-triggered separation on the outboard sections of the blade has to be modelled correctly. In this study, the blade grids had the most noticeable effect on the results, followed by the turbulence model and elasticity. With respect to the optimization, low-fidelity methods require special care, whereas CFD optimized blades were found to lead to more robust designs, even though they have only been optimized for a single point. This is explained by the more accurate modelling of the stall phenomenon with respect to geometrical changes.

Item URL in elib:https://elib.dlr.de/186243/
Document Type:Article
Title:JAXA-ONERA-DLR cooperation: results from rotor optimization in hover
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Wilke, Gunther AndreasUNSPECIFIEDhttps://orcid.org/0000-0002-1915-5307UNSPECIFIED
Bailly, JoelleOnera, The French Aerospace LabUNSPECIFIEDUNSPECIFIED
Date:April 2022
Journal or Publication Title:CEAS Aeronautical Journal
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 1-21
Keywords:Helicopter aerodynamics, Surrogate-based optimization, CFD
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:29 Apr 2022 12:29
Last Modified:29 Apr 2022 12:29

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