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Use of Global Drag Rise Boundaries to Investigate Ill-Posed Transonic Airfoil Optimization

Doherty, John J, Wang, Handing and Jin, Yaochu (2018) Use of Global Drag Rise Boundaries to Investigate Ill-Posed Transonic Airfoil Optimization In: AIAA Aviation 2018 conference, 25-29th June 2018, Atlanta, Georgia, USA.

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This paper presents a series of transonic airfoils, designed using differing optimization approaches, which are evaluated over a wide range of operating conditions using global aerodynamic performance maps. Global drag rise boundaries, which are identified, modelled and directly optimized during design, include drag divergence and onset of wave drag. The AIAA ADODG Case 2 airfoil optimization case is used to compare the results of the new global performance design approach with conventional multi-point optimization. The impact of alternative design formulations is presented in terms of both global performance maps and selected drag rise characteristics around the Case 2 design condition. In particular, the trade-off between drag divergence and the preceding onset of wave drag is discussed. The new approach addresses the issue of early excessive drag creep, which is typically encountered for optimization focused on a narrow range of operating conditions. The study provides some further insights into how a well posed optimization formulation for transonic airfoil design can potentially be established.

Item Type: Conference or Workshop Item (Conference Paper)
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
Doherty, John
Date : 2018
DOI : 10.2514/6.2018-3953
Copyright Disclaimer : Copyright 2018 American Institute of Aeronautics and Astronautics
Depositing User : Melanie Hughes
Date Deposited : 18 Sep 2018 10:50
Last Modified : 27 Nov 2018 15:28

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