Experimental investigation of a new spiral wingtip

Siddiqui, Naseeb Ahmed; Aldeeb, Mohamed; Asrar, Waqar; Sulaeman, Erwin

doi:10.15394/ijaaa.2018.1213

Cited by 3 publications

(3 citation statements)

References 25 publications

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“…Siddiqui et al [32] evaluated how cant angles and flexibility impact slotted wings' behavior (Fig. 22).…”

Section: Wind Tunnel Experiments On Bionic Slotted Wingsmentioning

confidence: 99%

“…19 Drag coefficients versus angle of attack for three aircraft wing models [28] 2, the slotted wing with a cant angle [30] Fig. 22 Details of slotted tip used in wind tunnel tests [32] values of C Di , dedicating that induced drag is reduced by a significant amount in the pre-stall region, ranging from 17 to 40%, by switching from the planar to the nonplanar configuration.…”

Section: Wind Tunnel Experiments On Bionic Slotted Wingsmentioning

confidence: 99%

“…31 Piper Pawnee aircraft equipped with wingtip sails [41] Fig. 32 Cessna Centurion with wingtip sails [43] applied to large and heavy aircraft. He combined advanced airfoil concepts into a swept, tapered planform that would interact with the wingtip airflow to reduce drag.…”

Section: Basic Theories Of Induced Drag and Wingtip Devicesmentioning

confidence: 99%

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A Brief Review on Aerodynamic Performance of Wingtip Slots and Research Prospect

et al. 2021

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Wingtip slots, where the outer primary feathers of birds split and spread vertically, are regarded as an evolved favorable feature that could effectively improve their aerodynamic performance. They have inspired many to perform experiments and simulations as well as to relate their results to aircraft design. This paper aims to provide guidance for the research on the aerodynamic mechanism of wingtip slots. Following a review of previous wingtip slot research, four imperfections are put forward: vacancies in research content, inconsistencies in research conclusions, limitations of early research methods, and shortage of the aerodynamic mechanism analysis. On this basis, further explorations and expansion of the influence factors for steady state are needed; more attention should be poured into the application of flow field integration method to decompose drag, and evaluation of variation in induced drag seems a more rational choice. Geometric and kinematic parameters of wingtip slot structure in the unsteady state, as well as the flexibility of wingtips, should be taken into account. As for the aerodynamic mechanism of wingtip slots, the emphasis can be placed on the study of the formation, development, and evolution of wingtip vortices on slotted wings. Besides, some research strategies and feasibility analyses are proposed for each part of the research.

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“…Siddiqui et al [32] evaluated how cant angles and flexibility impact slotted wings' behavior (Fig. 22).…”

Section: Wind Tunnel Experiments On Bionic Slotted Wingsmentioning

confidence: 99%

Section: Wind Tunnel Experiments On Bionic Slotted Wingsmentioning

confidence: 99%

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A Brief Review on Aerodynamic Performance of Wingtip Slots and Research Prospect

et al. 2021

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Numerical investigation of non-planarity and relative motion for bionic slotted wings

Liu,

Cheng,

Song

et al. 2023

AIP Advances

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Bird wings have split primary feathers that extend out from the wing surface. This structure is called the wingtip slot, which is recognized as a product of bird evolution to improve flight performance. In this paper, numerical simulations based on RANS (Reynolds-averaged Navier–Stokes) equations are conducted to examine and understand the influence of wingtip slots on six wings at Re = 100 000. The overlapping grid method, driven by an in-house UDF (User Defined Function), is used to model the motion of the bionic slotted wings. The motion law of the winglets is improved based on the law extracted from a level-flying bald eagle. Then the aerodynamic force, pressure distribution, vorticity contours, wake stream, and other flow structures of the slotted wings with different layouts were compared and analyzed. The results show a significant increase in aerodynamic force when the slotted wingtips are employed. The maximum lift-to-drag ratio is also improved in our designed wing model with a non-planar wingtip by a maximum of 34% from the base wing. Each winglet works as a single wing due to the existence of slots, with a chordwise pressure distribution similar to that of the main wing. The vortex structures of slotted wings show expressive changes in the tip vortex as compared with the base wing. Additionally, an innovative bionic slotted wing is proposed with a dynamic wingtip that forms varying gaps between winglets. Due to the collective mechanism of aerodynamic interaction among multiple winglets for the innovative wing, it acquires the optimal time-averaged force during a flapping period. As expected, the slotted wingtip reduces the main wingtip vortex intensity and creates weaker vortices. The non-planarity and relative motion of the wingtip strengthen its weakening effect on the wingtip vortex and wake.

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A review of the research status and progress on the aerodynamic mechanism of bird wings

Song¹,

Lang²,

Xue³

et al. 2021

Sci. Sin.-Tech.

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Experimental investigation of a new spiral wingtip

Cited by 3 publications

References 25 publications

A Brief Review on Aerodynamic Performance of Wingtip Slots and Research Prospect

A Brief Review on Aerodynamic Performance of Wingtip Slots and Research Prospect

Numerical investigation of non-planarity and relative motion for bionic slotted wings

A review of the research status and progress on the aerodynamic mechanism of bird wings

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