On the design of airfoils for low Reynolds numbers

Miley, S. J.

doi:10.2514/6.1974-1017

Cited by 11 publications

(5 citation statements)

References 2 publications

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“…Increasing the turbulence intensity aIso helped eliminate some of the hysteresis encountered in Cl and Cd. Pohlen (1983) also looked at the influence of turbulence intensity on a Miley airfoil (M06-13-128) (see Miley (1972)). He found that increasing the turbulence intensity helped reduce the hysteresis in Cl and Cd and slightly improved airfoil performance.…”

Section: Effect Of Trailing-edge Geometrymentioning

confidence: 98%

Low Reynolds number aerodynamics of low aspect-ratio wings

Pelletier

Mueller

1999

17th Applied Aerodynamics Conference

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Section: Effect Of Trailing-edge Geometrymentioning

confidence: 98%

Low Reynolds number aerodynamics of low aspect-ratio wings

Pelletier

Mueller

1999

17th Applied Aerodynamics Conference

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“…The second step in the design process was to apply an inverse conformal mapping method developed by Eppler (8) and modified by Miley (9). Through an iterative application of this method, an airfoil contour (which includes the angle of attack), corresponding to the given pressure distribution, was found.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Low-Speed Aerodynamic Characteristics of a 13.1-PERCENT-THICK, High-Lift Airfoil

Sivier

Ormsbee

Awker

1974

SAE Technical Paper Series

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This paper is concerned with the experimental study of the low-speed, sectional characteristics of a high-lift airfoil and the comparison of those characteristics with the predictions of the theoretical methods used in the airfoil's design. The 13.1-percent-thick, UI-1720 airfoil was found to achieve the predicted maximum lift coefficient of nearly 2.0. No uppersurface, flow separation was found below the stall angle of attack of 16 degrees; it appeared that stall was due to an abrupt leading-edge flow separation.

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“…Among the factors affecting UAV flight, the low Reynolds number operating condition is perhaps the most significant obstacle to overcome. Airfoil performance diminishes at lower Reynolds numbers, decreasing the coefficient of lift and increasing the coefficient of drag [3]. In examining the efficiency of airplane airfoils in comparison with bird wings, Withers [4] demonstrates that bird wings perform similarly to conventional airfoils at low Reynolds numbers.…”

Section: Introduction 1motivation and Goalsmentioning

confidence: 99%

Bioinspired wingtip devices: a pathway to improve aerodynamic performance during low Reynolds number flight

Lynch¹,

Mandadzhiev²,

Wissa³

2018

Bioinspir. Biomim.

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Birds are highly capable and maneuverable fliers, traits not currently shared with current small unmanned aerial vehicles. They are able to achieve these flight capabilities by adapting the shape of their wings during flight in a variety of complex manners. One feature of bird wings, the primary feathers, separate to form wingtip gaps at the distal end of the wing. This paper presents bio-inspired wingtip devices with varying wingtip gap sizes, defined as the chordwise distance between wingtip devices, for operation in low Reynolds number conditions of Re = 100 000, where many bird species operate. Lift and drag data was measured for planar and nonplanar wingtip devices with the total wingtip gap size ranging from 0% to 40% of the wing's mean chord. For a planar wing with a gap size of 20%, the mean coefficient of lift in the pre-stall region is increased by 7.25%, and the maximum coefficient of lift is increased by 5.6% compared to a configuration with no gaps. The nonplanar wingtip device was shown to reduce the induced drag. The effect of wingtip gap sizes is shown to be independent of the planarity/nonplanarity of the wingtip device, thereby allowing designers to decouple the wingtip parameters to tune the desired lift and drag produced.

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On the design of airfoils for low Reynolds numbers

Cited by 11 publications

References 2 publications

Low Reynolds number aerodynamics of low aspect-ratio wings

Low Reynolds number aerodynamics of low aspect-ratio wings

Low-Speed Aerodynamic Characteristics of a 13.1-PERCENT-THICK, High-Lift Airfoil

Bioinspired wingtip devices: a pathway to improve aerodynamic performance during low Reynolds number flight

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