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Aero-mechanical optimization of a contra-rotating open rotor and assessment of its aerodynamic and acoustic characteristics

Lepot, Ingrid and Leborgne, Michael and Schnell, Rainer and Yin, Jianping and Delattre, Gregory and Falissard, Fabrice and Talbotec, Jerome (2011) Aero-mechanical optimization of a contra-rotating open rotor and assessment of its aerodynamic and acoustic characteristics. Journal of Power and Energy, Vol. 225, pp. 850-863. SAGE. DOI: 10.1177/0957650911413695. ISSN 2041-2967.

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Within the frame of the ongoing 7th Framework European Project DREAM, this article presents a synthesis of Cenaero, DLR, and Onera’s joint effort to demonstrate the aerodynamic and acoustic optimization potential of a contra-rotating open rotor. Within WP 3.2 led by Snecma, the objective was to maximize the propellers efficiency at top-of-climb conditions and to minimize the noise emission at take-off focusing on interaction noise while fulfilling the thrust and torque split specifications at both operating points. These objectives were successfully met by the development and exploitation of efficient multi-objective three-dimensional Reynolds-averaged Navier–Stokes (RANS)-based surrogate-assisted optimization strategies. In order to assess the aerodynamic and acoustic characteristics of both baseline and optimized geometries, coupled unsteady RANS (URANS) simulation and farfield prediction based on an integral Ffowcs Williams–Hawkings approach were then carried out. The results demonstrate that although the acoustic criterion driving the optimization process did not lead to an improvement of the noise characteristics over the whole directivity range, it may be regarded as a cost-effective way to incorporate noiserelated aspects into the design intent.

Document Type:Article
Title:Aero-mechanical optimization of a contra-rotating open rotor and assessment of its aerodynamic and acoustic characteristics
AuthorsInstitution or Email of Authors
Lepot, Ingridingrid.lepot@cenaero.be
Leborgne, Michaelmichael.leborgne@cenaero.be
Schnell, Rainerrainer.schnell@dlr.de
Yin, Jianpingjianping.yin@dlr.de
Delattre, Gregorygregory.delattre@onera.fr
Falissard, FabriceFabrice.Falissard@onera.fr
Talbotec, Jeromejerome.talbotec@snecma.fr
Date:28 November 2011
Journal or Publication Title:Journal of Power and Energy
Refereed publication:Yes
In Open Access:Yes
In ISI Web of Science:Yes
Volume:Vol. 225
Page Range:pp. 850-863
Keywords:contra-rotating open rotor (CROR), surrogate-assisted optimization, evolutionary algorithms, surrogate models, CFD, CAA, (u)RANS, interaction tones
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 Quiet and Comfortable Rotorcraft
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Deposited By: Dr.-Ing. Jianping Yin
Deposited On:02 Nov 2012 14:43
Last Modified:02 Nov 2012 14:43

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