An investigation of kinematic parameters and stroke function on stroke reversal for three-dimensional vortex structures around a flapping insect wing

Lee, Hyeon Kyun; Jang, Jin Woo; Lee, Sang-Hwan

doi:10.1016/j.euromechflu.2019.08.007

Cited by 4 publications

(5 citation statements)

References 31 publications

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“…During hovering, the wing with phase flap (alula) provides the maximum lift but the lowest performance and a stabilizing effect on the LEV [ 159 ]. For a flapping drosophila, at high stroke amplitude, a hairpin-like vortex loop and stroke reversal affect the instant time the wake capture materializes [ 160 ]. Insects even compensate for wing damage.…”

Section: Unique Kinematic Patterns and Wing Flexibilitymentioning

confidence: 99%

Study of Mosquito Aerodynamics for Imitation as a Small Robot and Flight in a Low-Density Environment

et al. 2021

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In terms of their flight and unusual aerodynamic characteristics, mosquitoes have become a new insect of interest. Despite transmitting the most significant infectious diseases globally, mosquitoes are still among the great flyers. Depending on their size, they typically beat at a high flapping frequency in the range of 600 to 800 Hz. Flapping also lets them conceal their presence, flirt, and help them remain aloft. Their long, slender wings navigate between the most anterior and posterior wing positions through a stroke amplitude about 40 to 45°, way different from their natural counterparts (>120°). Most insects use leading-edge vortex for lift, but mosquitoes have additional aerodynamic characteristics: rotational drag, wake capture reinforcement of the trailing-edge vortex, and added mass effect. A comprehensive look at the use of these three mechanisms needs to be undertaken—the pros and cons of high-frequency, low-stroke angles, operating far beyond the normal kinematic boundary compared to other insects, and the impact on the design improvements of miniature drones and for flight in low-density atmospheres such as Mars. This paper systematically reviews these unique unsteady aerodynamic characteristics of mosquito flight, responding to the potential questions from some of these discoveries as per the existing literature. This paper also reviews state-of-the-art insect-inspired robots that are close in design to mosquitoes. The findings suggest that mosquito-based small robots can be an excellent choice for flight in a low-density environment such as Mars.

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Section: Unique Kinematic Patterns and Wing Flexibilitymentioning

confidence: 99%

Study of Mosquito Aerodynamics for Imitation as a Small Robot and Flight in a Low-Density Environment

et al. 2021

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“…2020; Lee et al. 2020). In a numerical study with optimization function, Kamisawa and Isogai showed that from hovering to fast forward flight to keep the necessary power minimal, the stroke plane angle should gradually increase (from about 8° to 88°) together with the wing phasing (from about 30° to 90° hindwing lead), while the rate of twist decreases, and the flapping amplitude of the forewing and the hindwing varies as 30°–60° and 20°–40° respectively (Kamisawa & Isogai 2008).…”

Section: Introductionmentioning

confidence: 99%

“…Studies have shown that a small change in the flapping motion of wings may lead to a large change in aerodynamic force generation (Sane & Dickinson 2001;Altshuler et al 2005;Shyy et al 2010). Recently, it has been shown that for a flapping winged system not only the range and timing (Lee, Jang & Lee 2020) of kinematic motions but the complex waveforms can influence the leading-edge vortex (LEV) formation and added mass effects (Bhat et al 2020;Lee et al 2020). In a numerical study with optimization function, Kamisawa and Isogai showed that from hovering to fast forward flight to keep the necessary power minimal, the stroke plane angle should gradually increase (from about 8°to 88°) together with the wing phasing (from about 30°t o 90°hindwing lead), while the rate of twist decreases, and the flapping amplitude of the forewing and the hindwing varies as 30°-60°and 20°-40°respectively (Kamisawa & Isogai 2008).…”

Section: Introductionmentioning

confidence: 99%

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The interplay of kinematics and aerodynamics in multiple flight modes of a dragonfly

et al. 2023

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This paper presents the effects of wing kinematics on both normal forward flight and escape flight of a dragonfly. A Navier–Stokes-based numerical model has been adopted, and results have been substantiated by experimental data. The wing kinematics of tethered specimens and the prescribed wing morphology of a free-flying dragonfly were used in the simulation. To shed light on the interplay between kinematics and aerodynamics, a parametric study of the kinematics has been conducted. It is found that in escape flight, the dragonfly generates additional lift while the thrust reduces and the overall efficiency drops. Compared with normal forward flight, the escape mode produces larger lift force peaks. When the kinematics change to facilitate escape flight, the aerodynamic forces are affected by not only the flapping kinematics but, in the case of the hindwing, the varied wing–wing vortex interactions. The direction of the resultant force on each wing changes according to the change of the mean of pitching angle and stroke plane angle. We found that in the studied configurations, the varied phasing of the wings has a marginal effect on the aerodynamics of the dragonfly. It reduces lift and increases thrust, and this force modulation is slightly more efficient when the local angle of attack also changes. On the other hand, the change of angle of attack played a major role in leading-edge vortex formations and directing the resultant forces of the wings. The results can be useful in developing flight control strategies for micro air vehicle design.

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“…Several authors [9][10][11] showed how the aerodynamic coefficients (including the slope of the lift coefficient) of flexible micro air vehicle (MAV) wings of low aspect ratio at low Reynolds number can either grow or decrease depending on the geometry of the wing and the settings of flexible parts. Furthermore, the aerodynamic performance of flexible wings under flapping conditions (typical of bio-inspired UAVs) and the influence of their aspect ratio have also attracted attention lately [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Influence of passive deformation in the lift coefficient of a NACA0012 wing model

Duran,

Lorite-Díez,

Konovalov-Shishov

et al. 2024

European Journal of Mechanics - B/Fluids

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An investigation of kinematic parameters and stroke function on stroke reversal for three-dimensional vortex structures around a flapping insect wing

Cited by 4 publications

References 31 publications

Study of Mosquito Aerodynamics for Imitation as a Small Robot and Flight in a Low-Density Environment

Study of Mosquito Aerodynamics for Imitation as a Small Robot and Flight in a Low-Density Environment

The interplay of kinematics and aerodynamics in multiple flight modes of a dragonfly

Influence of passive deformation in the lift coefficient of a NACA0012 wing model

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