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https://doi.org/10.3938/NPSM.69.776
Effects of Strake Shape on the Vortex Pair Interaction of a Double-Delta Wing
New Phys.: Sae Mulli 2019; 69: 776~784
Published online July 31, 2019;  https://doi.org/10.3938/NPSM.69.776
© 2019 New Physics: Sae Mulli.

Hyoungseog CHUNG, Deuksu KIM, Seunghyun LEE*

Republic of Korea Air Force Academy, Cheongju 28187, Korea
Correspondence to: shyunlee1@naver.com
Received April 23, 2019; Revised June 17, 2019; Accepted June 21, 2019.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Maintaining flight stability at higher angles of attack is one of the crucial factors in designing modern fighter aircraft. Conventional fighters usually generate two co-rotating vortices, are from the main wing and the after from the strake. These vortex systems merge into a strong vortex as they travel aft, generating beneficial effects such as lift augmentation. However, the merged vortex is more susceptible to vortex breakdown due to its higher rotational velocity, which deteriorates the aircraft performance. This paper investigates the effects of the strake shape on the vortex interaction and the vortex breakdown phenomenon. Both wind tunnel tests and computational analyses were carried out for a conventional strake delta wing and a reversed strake delta configuration, which can generate a counter-rotating vortex pair. The results indicate that the counter-rotating vortex pair accelerates both the interaction and the merging process and delays the vortex breakdown at higher angles of attack. We found that the aerodynamic characteristics and stability performance could be significantly improved by utilizing the variable strake-shape concept.
PACS numbers: 47.11.$-$j,47.32.C$-$,47.32.Cd
Keywords: Double-delta wing, CFD (Computational fluid dynamics), Vertex flow, Wind tunnel test


July 2019, 69 (7)
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