Effect of leading-edge tubercles on the flow over low-aspect-ratio wings at low Reynolds number

Pengxin Yang; Yichen Zhu; Jinjun Wang

doi:10.1016/j.taml.2022.100386

Effect of leading-edge tubercles on the flow over low-aspect-ratio wings at low Reynolds number

Pengxin Yang
, Yichen Zhu
, Jinjun Wang^*

^*Corresponding author for this work

School of Aeronautic Science and Engineering

Beihang University

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

Two-dimensional time-resolved particle image velocimetry (TR-PIV) and stereographic particle image velocimetry (SPIV) techniques were used to investigate the effect of leading-edge tubercles on the flow over low-aspect-ratio wing models. The angle of attack is fixed at 10°, and the Reynolds number based on chord length is 5.8 × 10³. It is shown that the leading-edge tubercles can effectively mitigate flow separation in the model and also reduce the contribution of wake vortex to the fluctuating energy of flow. Counter-rotating vortex pairs (CVPs) initiated from the peak of leading-edge tubercles can promote nearby momentum exchange, enhance mixing of the flow and increase the energy contained in the boundary layer, which results in resisting the larger adverse pressure gradient. Therefore, it is concluded that CVPs play an important role in mitigating the flow separation for wings with leading-edge tubercles.

Original language	English
Article number	100386
Journal	Theoretical and Applied Mechanics Letters
Volume	13
Issue number	1
DOIs	https://doi.org/10.1016/j.taml.2022.100386
State	Published - Jan 2023

Keywords

Flow separation
Leading-edge tubercles
Low-aspect-ratio

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10.1016/j.taml.2022.100386

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title = "Effect of leading-edge tubercles on the flow over low-aspect-ratio wings at low Reynolds number",

abstract = "Two-dimensional time-resolved particle image velocimetry (TR-PIV) and stereographic particle image velocimetry (SPIV) techniques were used to investigate the effect of leading-edge tubercles on the flow over low-aspect-ratio wing models. The angle of attack is fixed at 10°, and the Reynolds number based on chord length is 5.8 {\texttimes} 103. It is shown that the leading-edge tubercles can effectively mitigate flow separation in the model and also reduce the contribution of wake vortex to the fluctuating energy of flow. Counter-rotating vortex pairs (CVPs) initiated from the peak of leading-edge tubercles can promote nearby momentum exchange, enhance mixing of the flow and increase the energy contained in the boundary layer, which results in resisting the larger adverse pressure gradient. Therefore, it is concluded that CVPs play an important role in mitigating the flow separation for wings with leading-edge tubercles.",

keywords = "Flow separation, Leading-edge tubercles, Low-aspect-ratio",

author = "Pengxin Yang and Yichen Zhu and Jinjun Wang",

note = "Publisher Copyright: {\textcopyright} 2022 The Authors",

year = "2023",

month = jan,

doi = "10.1016/j.taml.2022.100386",

language = "英语",

volume = "13",

journal = "Theoretical and Applied Mechanics Letters",

issn = "2095-0349",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Effect of leading-edge tubercles on the flow over low-aspect-ratio wings at low Reynolds number

AU - Yang, Pengxin

AU - Zhu, Yichen

AU - Wang, Jinjun

PY - 2023/1

Y1 - 2023/1

N2 - Two-dimensional time-resolved particle image velocimetry (TR-PIV) and stereographic particle image velocimetry (SPIV) techniques were used to investigate the effect of leading-edge tubercles on the flow over low-aspect-ratio wing models. The angle of attack is fixed at 10°, and the Reynolds number based on chord length is 5.8 × 103. It is shown that the leading-edge tubercles can effectively mitigate flow separation in the model and also reduce the contribution of wake vortex to the fluctuating energy of flow. Counter-rotating vortex pairs (CVPs) initiated from the peak of leading-edge tubercles can promote nearby momentum exchange, enhance mixing of the flow and increase the energy contained in the boundary layer, which results in resisting the larger adverse pressure gradient. Therefore, it is concluded that CVPs play an important role in mitigating the flow separation for wings with leading-edge tubercles.

AB - Two-dimensional time-resolved particle image velocimetry (TR-PIV) and stereographic particle image velocimetry (SPIV) techniques were used to investigate the effect of leading-edge tubercles on the flow over low-aspect-ratio wing models. The angle of attack is fixed at 10°, and the Reynolds number based on chord length is 5.8 × 103. It is shown that the leading-edge tubercles can effectively mitigate flow separation in the model and also reduce the contribution of wake vortex to the fluctuating energy of flow. Counter-rotating vortex pairs (CVPs) initiated from the peak of leading-edge tubercles can promote nearby momentum exchange, enhance mixing of the flow and increase the energy contained in the boundary layer, which results in resisting the larger adverse pressure gradient. Therefore, it is concluded that CVPs play an important role in mitigating the flow separation for wings with leading-edge tubercles.

KW - Flow separation

KW - Leading-edge tubercles

KW - Low-aspect-ratio

UR - https://www.scopus.com/pages/publications/85140883719

U2 - 10.1016/j.taml.2022.100386

DO - 10.1016/j.taml.2022.100386

M3 - 文章

AN - SCOPUS:85140883719

SN - 2095-0349

VL - 13

JO - Theoretical and Applied Mechanics Letters

JF - Theoretical and Applied Mechanics Letters

IS - 1

M1 - 100386

ER -

Effect of leading-edge tubercles on the flow over low-aspect-ratio wings at low Reynolds number

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Keywords

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