Wind tunnel measurements of parafoil geometry and aerodynamics

Matos, C.; Mahalingam, R.; Ottinger, G.; Klapper, J.; Funk, Robert; Komerath, Narayanan

doi:10.2514/6.1998-606

Cited by 16 publications

(7 citation statements)

References 3 publications

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“…A release mechanism was provided to protect against severe gust loads, capable of overturning the truck. C. Matos et al 10) measured the section profiles and leading-edge collapse of a paraglider during operation in a wind tunnel based on video photogrammetry combined with a laser sheet.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Measurements of Aerodynamic Characteristics of Paraglider Canopy Cells

Mashud

Umemura

2006

Trans. Japan Soc. Aero. S Sci.

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The aerodynamic characteristics of paraglider canopy cells were examined using an inflatable cell model with rigid ribs, which was proposed in our previous paper. The model is constructed by rapping the side edges of an appropriately shaped thin vinyl sheet along the perimeter of two parallel airfoil-shaped rigid ribs, and the wind tunnel experiment utilizing it represents a cell of an infinite array of identical cells placed in a uniform stream. The three-dimensional, inflated surface profile and surface pressure distribution of an inflatable cell model with a large air-intake opening were measured to characterize aerodynamic characteristics due to the inflation of upper and lower surfaces. The underlying physics were also explored in detail.

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Section: Introductionmentioning

confidence: 99%

Three-Dimensional Measurements of Aerodynamic Characteristics of Paraglider Canopy Cells

Mashud

Umemura

2006

Trans. Japan Soc. Aero. S Sci.

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“…Although much might be learned from studies of parafoils, most have been aimed at finding the overall lift and drag coefficients rather than the sectional characteristics (see, for example, Ref. 20). Given the uncertainty in these data, results will be presented here for a range of likely values.…”

Section: Optimal Shapesmentioning

confidence: 99%

Optimal Loading of a Tension Kite

Jackson

2005

AIAA Journal

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A theory is presented for the optimum shape of tension kites based on lifting-line theory combined with the requirement that the kite shape and tension be in equilibrium everywhere with the forces normal to it. The flying shape of the kite then emerges as part of the solution, along with the distribution of twist, which must be built into any particular kite to achieve the required loading. Results are presented first for a kite in ideal flow, when all the important parameters scale with the lift coefficient, and then for a kite of realistic shape and profile drag. Nomenclature A= reference area (e.g., top surface of the kite) b = kite span, or arc length of lifting line C D , C L , C T = force coefficients based on 1 2 ρ AU 2 D, L = aerodynamic drag and lift s = distance along kite from centerline T = tension in each of two kite lines t, φ = nondimensional measures of distance from centerline u, v, w = induced speeds v n = induced speed in the kite plane, normal to kite and to U x, y, z = coordinate axes α eff = effective angle of attack, α g − α i α g = total geometric angle of attack, α t + α k α i = induced angle of attack α k = incidence due to inclination ε of the kite plane α t = incidence due to twist, measured from zero-lift angle (s) = circulation of the kite at span s γ (s) = wake vortex sheet strength at span s ε = drag angle and flying angle of the kite θ(s) = slope of the kite in its own plane = aspect ratio, b 2 /A ρ, U = density and speed of incident flow

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“…The deformed surface geometry of a parafoil was presented by a video-based photogrammetry during tethered testing in a low-speed tunnel [1,2]. Due to the fact that this kind of test presents a high cost, numerical simulation has become a popular way to analyze the deformation of parafoils.…”

Section: Introductionmentioning

confidence: 99%

Analytical Study on Deformation and Structural Safety of Parafoil

Wang

2018

International Journal of Aerospace Engineering

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This study focuses on the cell bump distortion and bearing capacity of parafoil structure. Based on the mechanical properties of the membrane structure, the spanwise model of parafoil inflation was established and verified by comparing with the fluid-structure interaction (FSI) results. Because the internal pressure is very low, the chordwise stiffness is mainly generated by suspending lines. The chordwise model of inflated parafoil was established in consideration of elastic force and aerodynamic force. The results show that the cell is slenderer; the canopy surface is smoother; the aerodynamic load has a light effect on the shrinkage and bump ratios; when the cell width is constant, the critical dynamic pressure reduces k times with the k times increasing in parafoil area; and the design parameters of the first-row line OA have significant effects on the structural stiffness of inflated parafoil. The analytical model is useful for the weakening deformation design and the safety discussion of large parafoil for rocket booster recovery.

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Wind tunnel measurements of parafoil geometry and aerodynamics

Cited by 16 publications

References 3 publications

Three-Dimensional Measurements of Aerodynamic Characteristics of Paraglider Canopy Cells

Three-Dimensional Measurements of Aerodynamic Characteristics of Paraglider Canopy Cells

Optimal Loading of a Tension Kite

Analytical Study on Deformation and Structural Safety of Parafoil

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