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JAXA-ONERA-DLR COOPERATION: Results From Rotor Optimization in Hover

Wilke, Gunther Andreas and Bailly, Joëlle and Kimura, Keita and Tanabe, Yasutada (2021) JAXA-ONERA-DLR COOPERATION: Results From Rotor Optimization in Hover. 47th European Rotorcraft Forum, 7-10 September 2021, Virtual, United Kingdom.

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A cooperation on the aerodynamic optimization of helicopter rotors has been formed by JAXA, ONERA and DLR. This work represents the conclusions drawn 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. Following up on this, the HART-II blade chord distribution and twist are optimized with the low-fidelity tools as well as CFD. Due to observed differences in the outcome of the CFD simulations for the low-fidelity optimized blades by the partners, a deeper investigation of the effects of the turbulence modelling approach, elasticity and grid topology is undertaken. The outcome is that the chosen flight condition is close to thrust of the maximum Figure of Merit and 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, care must be taken when optimizing with low-fidelity methods, whereas CFD optimized blades were found to lead to more robust designs even though they have only been optimized for a single point. Reason is the more accurate modelling of the stall phenomenon with respect to geometrical changes.

Item URL in elib:https://elib.dlr.de/145626/
Document Type:Conference or Workshop Item (Speech)
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
Date:September 2021
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:HARTII, rotor optimization, SBO
Event Title:47th European Rotorcraft Forum
Event Location:Virtual, United Kingdom
Event Type:international Conference
Event Dates:7-10 September 2021
Organizer:Royal Aeronautical Society
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 Nov 2021 13:21
Last Modified:29 Nov 2021 13:21

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