Article
Engineering, Aerospace
Goktug Kocak, Mehmet Metin Yavuz
Summary: In this study, the influence of ground effect on the aerodynamics and stability of a non-slender delta wing with a sweep angle of 45 degrees was investigated. The results showed that the ground effect had a significant impact on the aerodynamic performance and stability of the wing, with an increase in drag and lift forces as the wing height decreased. The pressure measurements revealed complex effects on vortex reattachment and strength.
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Mechanical
Hamed Khodabakhshian Naeini, Mahdi Nili-Ahmadabadi, Yoon Seong Park, Kyung Chun Kim
Summary: The experimental results demonstrate that the use of nature-inspired needle-shaped vortex generators (VGs) on a double-delta wing significantly improves the flow structure by increasing flow momentum, energizing near-surface flow, creating a more concentrated vortex system, and delaying vortex breakdown.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Mechanics
Chenguang Lai, Liangkui Tan, Yujie Zhu, Shengji Zhu, Shigeru Obayashi
Summary: This study numerically examines the aeroacoustic characteristics of a multi-directional wing under the wing-in-ground effect. The results show that different intensities of the wing-in-ground effect led to remarkable differences in the characteristic frequency of aerodynamic noise induced by the multi-directional wing.
Article
Engineering, Aerospace
Sergen Tumse, Ilyas Karasu, Besir Sahin
Summary: The ground effect has a significant impact on the vortical flow characteristics of nonslender delta wings, leading to premature leading-edge vortex breakdown and complex disorganized flow structures.
JOURNAL OF AEROSPACE ENGINEERING
(2022)
Article
Engineering, Marine
Mehmet Oguz Tasci, Sergen Tumse, Besir Sahin
Summary: This study qualitatively and quantitatively examined the vortical flow structures over a 70-deg-swept slender delta wing in ground effect. The results showed that the magnitude of leading-edge vortices decreased as the wing moved closer to the ground, while the inboard flow from the side leading-edge towards the central axis of the wing increased. The size of the leading-edge vortex core region also increased when the wing altitude was lowered towards the ground surface. These findings indicate that the wing aerodynamics is positively affected by its proximity to the ground.
Article
Engineering, Multidisciplinary
Ping-Han Chung, Po-Hsiang Chang, Szu- Yeh
Summary: In this study, the aerodynamic effect of an alula-like vortex generator (alula-VG) on a revolving wing was investigated. The results showed that the position of the alula-VG and the angle of attack of the wing model played important roles in the aerodynamic effect.
Article
Entomology
Hao Li, Mostafa R. A. Nabawy
Summary: This study investigates the effect of wing planform shape on the aerodynamic performance of insect flapping wings. The results show that the aspect ratio and root offset mainly influence the flow detachment area near the wingtip, while the radial centroid location mainly affects the local flow evolution time on the wing surface. Increasing the aspect ratio is beneficial up to a certain limit, increasing the centroid location increases efficiency, and increasing the root offset has a small effect on aerodynamic efficiency. The study provides valuable insights into optimizing wing design for improved aerodynamic performance.
Article
Engineering, Multidisciplinary
Hadar Ben-Gida, Roi Gurka
Summary: This study investigates whether stationary leading-edge vortices (LEV) can form over nonlinear swept-back high-aspect-ratio (high-AR) wings inspired by the wing shape of the common swift. The results suggest that the common swift can generate stationary LEVs over its swept-back wings, potentially supporting up to 60% of its weight.
BIOINSPIRATION & BIOMIMETICS
(2022)
Article
Multidisciplinary Sciences
Rachel M. Starkweather, Svetlana V. Poroseva, David T. Hanson
Summary: This paper reveals the shape of the leading-edge cross section of a cicada's wing for the first time and analyzes its variability along the wing. It also identifies and quantifies similarities in characteristic dimensions of this shape in the wings of three different cicada species.
SCIENTIFIC REPORTS
(2021)
Article
Thermodynamics
Shantanu S. Bhat, Mark C. Thompson
Summary: The aerodynamic performance of an insect wing is largely dependent on the leading-edge vortex (LEV). The research shows that a curved leading edge can enhance the lift and power economy of the wing, both at low and high Reynolds numbers.
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
(2022)
Article
Mechanics
Zhanzhou Hao, Bo Yin, Prasert Prapamonthon, Guowei Yang
Summary: Through numerical simulation, it is found that the swimming speed of penguins mainly relies on the adjustment of feathers rather than wing flapping. The optimal feathering angle is crucial for achieving the highest swimming efficiency, and the outer three-fifths of the wing contribute 85.4% of thrust generation.
Article
Mechanics
Kevin J. Wabick, Kyle C. Johnson, Randall L. Berdon, Brian S. Thurow, James H. J. Buchholz
Summary: Plenoptic particle image velocimetry and surface pressure measurements were used to analyze the early development of leading-edge vortices (LEVs) created by a flat-plate wing rolling in a uniform flow. Different conditions were considered, including different advance coefficients and wing radii of gyration. The vorticity sources and sinks were quantified for a control region using a vorticity transport framework, revealing distinct patterns of vortex evolution and vorticity transport mechanisms. Changes in radius of gyration and advance ratio had significant effects on the vortex stability and transport processes.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Engineering, Mechanical
Yunlong Zheng, Qiulin Qu, Peiqing Liu, Tianxiang Hu
Summary: The ground effect aerodynamics and flow physics of a 2D dragonfly wing hovering in an inclined stroke plane are investigated. An analysis road map is proposed to explain the influence of the ground on the flow field, pressure distribution on the wing surface, and the aerodynamic force.
JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME
(2022)
Article
Engineering, Mechanical
Reynolds Addo-Akoto, Hyeon-Ho Yang, Jong-Seob Han, Jae-Hung Han
Summary: The study investigates the effect of wing flexibility on aerodynamic characteristics and reveals that flexible wings can generate wider and more uniform downwash, leading to enhanced aerodynamic performance.
JOURNAL OF FLUIDS AND STRUCTURES
(2023)
Article
Computer Science, Interdisciplinary Applications
Kaan Yutuk, Alp Tikenogullari, Ismail H. Tuncer
Summary: This study investigates vortex dominated flows over a close-coupled canard-wing-body configuration at high angles of attack using the open-source flow solver SU2 in a parallel computing environment. Validation studies and comparisons with experimental and numerical studies show that SU2 accurately predicts vortex dynamics, breakdown, induced surface pressure distributions, and aerodynamic loads for canard-wing-body configurations at high angles of attack.
COMPUTERS & FLUIDS
(2021)
Article
Engineering, Aerospace
Andre F. P. Ribeiro, Carlos Ferreira, Damiano Casalino
Summary: This study compares a filament-based free wake panel method to experimental and validated numerical data in order to simulate propeller slipstreams and their interaction with aircraft components. The results show that the free wake panel method is able to successfully capture the slipstream deformation and shearing, making it a useful tool for propeller-wing interaction in preliminary aircraft design.
AEROSPACE SCIENCE AND TECHNOLOGY
(2024)