Effect of Wavy Leading Edge on Pitching Rectangular Wing

Rohmawati, Iis; Arai, Hiroshi; Nakashima, Takuji; Mutsuda, Hidemi; Doi, Yoshihiro

doi:10.5226/jabmech.9.1

Cited by 7 publications

(5 citation statements)

References 9 publications

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“…Meanwhile, there are no substantial dissimilarities between the baseline and WLE wings for AR 7.9 wing. A similar tendency was discovered in reference [21], where the WLE wing performed best during upstroke motion rather than downstroke action. The presence of WLE influences fluid flow properties where a twisted stream-wise vortical flow around the WLE was identified during both upstroke and downstroke motion, with the vortical flow being stronger during upstroke motion than downstroke motion.…”

Section: Results and Discussion Unsteady Analysis Of Rectangular Wingsupporting

confidence: 85%

“…In contrast, no significant variations were noticed for the AR 7.9 wing. These results are identical to those reported in prior references [19,21], where the impact of WLE on a rectangular wing was explored and greater performance was seen during upstroke motion rather than downstroke motion. These findings imply that the effect of WLE on wing performance is strongly dependent on the AR and the wing motion.…”

Section: Discussionsupporting

confidence: 89%

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Wavy Leading Edge (WLE) Influence on a Rectangular Wing Using an Unsteady Analysis Approach

Rohmawati

Arai²,

Nurjannah

2023

JMESI

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A rectangular wing with Wavy Leading Edge (WLE) effect was investigated experimentally and numerically. This research was carried out with the NACA 0018 profile. The morphology of humpback whale flippers, which are blunt and rounded in a specific pattern, inspired the design of the WLE. The rectangular wing was explored in pitching motion with a reduced frequency of k = 0.25 and varied aspect ratios. Multiple aspect ratios (AR) of the rectangular wing have been evaluated to determine the best wing aspect ratio, notably 3.9, 5.1, and 7.9. Only at AR 3.9 and 5.1 does the WLE perform efficiently in both upstroke and downstroke motion. WLE has a sinusoidal function shape. The improvement of lift force was stronger during upstroke motion than during downstroke motion. The stall is minimized during the pitching motion of the WLE wing, according to the numerical simulation. This result could be applied to fin stabilizers or wind turbines.

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Section: Results and Discussion Unsteady Analysis Of Rectangular Wingsupporting

confidence: 85%

Section: Discussionsupporting

confidence: 89%

Wavy Leading Edge (WLE) Influence on a Rectangular Wing Using an Unsteady Analysis Approach

Rohmawati

Arai²,

Nurjannah

2023

JMESI

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“…As expected, the WLE wing able to acquire the lift coefficient (Cl) after stall condition at angles α > 18°. WLE wing has superior forces after post-stall region compared to the baseline wing [18]. To analyze the WLE effect in various AR, L/D ratio has been carried out after stall condition i.e.…”

Section: Rectangular Wingmentioning

confidence: 99%

Optimizing Effect of Wavy Leading Edge (WLE) in Rectangular Wing and Taper Wing

Rohmawati

Arai²,

Mutsuda

et al. 2021

JMESI

Self Cite

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Experimental and numerical research have been performed to investigate the Wavy Leading Edge (WLE) effect on the rectangular wing. The WLE is inspired by humpback whale flipper morphology which is blunt and rounded in certain form pattern. This flipper shape plays an important role for its behaviour specially capturing their prey. This advantage could be applied to other systems such as fin stabilizers or wind turbines. Steady cases in various aspect ratios were conducted to find out the optimum effect of WLE with baseline NACA 0018 profile at Reynolds number 1.4 x 105. The chord length of the wing (c) was 125 mm. The WLE shape defined as wavelength (W) 8% of c and amplitude (d) is 5% of c. The aspect ratio (AR) variations were 1.6; 3.9; 5.1; 7.9 and 9.6. A simple rectangular form of the wing was selected to analysis the WLE effect on the various ARs. The taper wing shape is applied to find out the WLE effect at the AR 7.9. three types of taper ratio (TR) are 0.1; 0.3 and 0.5. The results show that the WLE on the taper wing has better advantage to control the stall in steady case. Another impressive result was the WLE wing with AR 7.9 and TR 0.3 has the best lift coefficient and pressure distribution.Keywords: stall, wavy leading edge, steady case, rectangle wing, taper wing, aspect ratio.

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“…Miklosovic et al [18], conducted experimental trials on sinusoidal leading-edge wings, and their findings revealed that wings with larger amplitudes exhibited a more gradual stall pattern, attributed to stalls occurring later in the regions behind the peaks compared to those behind the troughs. Other scholars validated this through an experimental and numerical investigation of a rectangular wing incorporating the Wavy Leading Edge effect, demonstrating improved lift force during pitching motion with minimized stall [19][20][21], suggesting potential applications in wind turbines [22][23][24]. The experimental investigation performed by N. Karthikeyan et al [25,26] examined the impact of wavy leading edges, revealing tubercles' effectiveness in maintaining attached flow and reducing recirculating zones, although their influence on separation point variability and wake width post-stall requires further exploration.…”

Section: Introduction 1backgroundmentioning

confidence: 86%

Investigating Mechanical Response and Structural Integrity of Tubercle Leading Edge under Static Loads

Esmaeili,

Jabbari,

Zehtabzadeh

et al. 2024

Modelling

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This investigation into the aerodynamic efficiency and structural integrity of tubercle leading edges, inspired by the agile maneuverability of humpback whales, employs a multifaceted experimental and computational approach. By utilizing static load extensometer testing complemented by computational simulations, this study quantitatively assesses the impacts of unique wing geometries on aerodynamic forces and structural behavior. The experimental setup, involving a Wheatstone full-bridge circuit, measures the strain responses of tubercle-configured leading edges under static loads. These measured strains are converted into stress values through Hooke’s law, revealing a consistent linear relationship between the applied loads and induced strains, thereby validating the structural robustness. The experimental results indicate a linear strain increase with load application, demonstrating strain values ranging from 65 με under a load of 584 g to 249 με under a load of 2122 g. These findings confirm the structural integrity of the designs across varying load conditions. Discrepancies noted between the experimental data and simulation outputs, however, underscore the effects of 3D printing imperfections on the structural analysis. Despite these manufacturing challenges, the results endorse the tubercle leading edges’ capacity to enhance aerodynamic performance and structural resilience. This study enriches the understanding of bio-inspired aerodynamic designs and supports their potential in practical fluid mechanics applications, suggesting directions for future research on manufacturing optimizations.

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Effect of Wavy Leading Edge on Pitching Rectangular Wing

Cited by 7 publications

References 9 publications

Wavy Leading Edge (WLE) Influence on a Rectangular Wing Using an Unsteady Analysis Approach

Wavy Leading Edge (WLE) Influence on a Rectangular Wing Using an Unsteady Analysis Approach

Optimizing Effect of Wavy Leading Edge (WLE) in Rectangular Wing and Taper Wing

Investigating Mechanical Response and Structural Integrity of Tubercle Leading Edge under Static Loads

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