An experimental study on the effect of a novel nature-inspired 3D-serrated leading edge on the aerodynamic performance of a double delta wing in the transitional flow regime

Naeini, Hamed Khodabakhshian; Nili-Ahmadabadi, Mahdi; Kim, Kyung Chun

doi:10.1007/s12206-019-1136-x

Cited by 7 publications

(1 citation statement)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Experimental analysis conducted by Yamada et al (2019) in a low-speed tunnel at a free stream velocity of 18m/s indicated that the use of gurney flaps on the BWB configurations generated a pair of counter-rotating vortices and also improved the lift locally. Several BWBs under the prototyping stage are reported by Thompson et al (2011), Becker and Sheffler (2016), Rodzewicz et al (2018), Footohi et al (2019), Naeini et al (2019Naeini et al ( , 2021) and many others.…”

Section: Introductionmentioning

confidence: 99%

Flow Field Investigation of a Blended Wing Body in Low Speeds

2023

JAFM

View full text Add to dashboard Cite

With the advancement in the modern transport system, it has become imperative to achieve larger aircraft volume at minimum cost wherein aerodynamics plays a major role. The present work aims to investigate the flow over a typical blended wing body (BWB) configuration at different angles of attack adopting experimental and computational techniques. Experiments consisted of the force measurements and oil flow visualizations at a free stream velocity of around 19 m/s. Computations were made using the commercially available software ANSYS 18.1. Results indicated that the use of a Blended Wing Body Configuration resulted in improved aerodynamic characteristics in comparison to other wing configurations such as Delta/ Double delta wings. Surface flow visualization carried out over the BWB configuration indicated the reason behind increased lift coefficients. Reasonable agreement of experiments and computations was observed.

show abstract

Section: Introductionmentioning

confidence: 99%

Flow Field Investigation of a Blended Wing Body in Low Speeds

2023

JAFM

View full text Add to dashboard Cite

show abstract

Research on the aerodynamic characteristics of dragonfly leading edge

Hu,

Zhu,

Liu

et al. 2024

Microscopy Res & Technique

View full text Add to dashboard Cite

Dragonflies are some of the most stable and maneuverable flying organisms. To explore the mechanism of how dragonfly leading edges enhance flight lift, this article conducts a detailed study on the leading edge veins and the microstructures on them of dragonfly wings. Observations have discovered the special leading edge vein and the regularly distributed microstructures on the leading edge vein. A biomimetic model has been established, and computational fluid dynamics (CFD) simulation analysis has been conducted on the biomimetic model. The analysis explores the effects of microstructure characteristics, distribution patterns, and positions on the aerodynamic characteristics of dragonfly gliding. The analysis shows that the leading edge structure influences the incoming flow, simultaneously promotes the formation of the leading edge vortex (LEV), and increases the lift‐to‐drag ratio by up to 4%. A wing prototype featuring biomimetic microstructures is subsequently fabricated and tested in wind tunnel experiments. Compared with a control group without leading edge structures, the airflow passing through the biomimetic structures is influenced by the shape and arrangement of these structures. The smoother transition of the leading edge vein's shape facilitates the flow of air. The microstructures primarily filter and accelerate the airflow. The spacing of the microstructures affects the stability of the airflow, thereby influencing aerodynamic performance. Additionally, the middle‐row arrangement of microstructures is more beneficial for gliding conditions, while the upper‐row arrangement is more advantageous for flapping conditions. These findings enhance our understanding of insect wings and advance micro aerial vehicle applications.Research HighlightsThis study observed the leading‐edge veins and microstructures of dragonfly wings in detail. Using a biomimetic model and computational fluid dynamics (CFD) simulations, it was found that these leading‐edge structures promote the formation of leading‐edge vortices (LEV), increasing the lift‐to‐drag ratio by up to 4%. Wind tunnel experiments demonstrated that wings with biomimetic microstructures significantly improved airflow smoothness and lift compared with control wings. Additionally, the arrangement of microstructures greatly affects airflow stability and aerodynamic performance, with middle‐row arrangements being more beneficial for gliding and upper‐row arrangements for flapping conditions. These findings enhance our understanding of insect wings and provide innovative guidance for designing efficient micro aerial vehicles.

show abstract