Influence of the air inlet configuration on the performances of a paraglider open airfoil

Belloc, Hervé; Chapin, Vincent; Manara, Francesco; Sgarbossa, Francesco; Forsting, Alexander Meyer

doi:10.1504/ijad.2016.080510

Cited by 7 publications

(4 citation statements)

References 9 publications

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“…Additionally, the concave shape of the optimized airfoil eliminated the separation bubbles appearing on the external lower edge of both classical inlets, which not only decreased the effects of the inlet on drag by 20 drag counts compared to the classical inlet, but also it would improve recovery in case of stalling of the paraglider. As a matter of fact, the effects of an opening on the lift and drag characteristics, are less for an airfoil with the SharkNose concept, rather than introducing an inlet to a classical airfoil, as was concluded from this study, and previous studies that investigated different classical inlet configurations numerically or experimentally [10][11][12] to cite a few. Finally, the optimized airfoil with 1%c has a slightly better overall paragliding performance than that with 2%c .…”

Section: Best Inlet Configurationmentioning

confidence: 71%

Optimal Aerodynamic Shape Optimization of a Paraglider Airfoil Based on the Sharknose Concept

Abdelqodus

Kursakov

2018

MATEC Web Conf.

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The effects of classical air inlet configurations on the aerodynamic performance of a paraglider airfoil are firstly presented. Followed by conducting gradient-based aerodynamic shape optimization of the baseline airfoil used in the investigation of the classical air inlets. Different air inlet configurations are introduced to the optimized profile, and there effects on the aerodynamic performance are then compared to the initial and optimized airfoils. The Reynolds averaged Navier-Stokes equations (RANS) are solved for the flow field around the closed and open airfoils. The canopy is assumed to be smooth, rigid and impermeable. Results are focused on both of lift and drag coefficients for performance analysis and on the internal pressure coefficient which can be critical for a real flexible wing regarding the risk of collapse.

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Section: Best Inlet Configurationmentioning

confidence: 71%

Optimal Aerodynamic Shape Optimization of a Paraglider Airfoil Based on the Sharknose Concept

Abdelqodus

Kursakov

2018

MATEC Web Conf.

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“…Several works devoted to the development of control models, guidance systems, and trajectory optimization can be found in the literature [9][10][11][12][13][14][15]. Further, a representative number of computational fluid dynamics (CFD)-based aerodynamic characterization is available [6,[16][17][18][19][20]. However, few experimental results related to the paraglider cell deformation can be found in recent literature [21].…”

Section: Structural Aspectsmentioning

confidence: 99%

Wind-Tunnel Measurement of Differential Pressure on the Surface of a Dynamically Inflatable Wing Cell

Benedetti

Veras

2021

Aerospace

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An instrumentation system for in-situ measurement of the inner-outer pressure differential at the upper and lower surfaces of dynamically inflatable wings is designed and tested, revealing important insights into the aerodynamic characteristics of inflatable airfoils. Wind tunnel tests demonstrated full capability of low-pressure differential readings in the range of 1.0–120 Pa, covering speeds from 3 to 10 m/s at angles of attack from −20 to +25°. Readings were stable, presenting coefficients of variation from 2% to 7% over the operational flight envelope. The experimental data confirmed the occurrence of a bottom leading-edge recirculation bubble, linked to the low Reynolds regime and the presence of an air intake. It supported the proposition of a novel approach to aerodynamic characterization based on local pressure differentials, which takes in account the confined airflow structure and provides lift forces estimations compatible with practical observation. The results were also compatible with data previously obtained following different strategies and were shown to be effective for parameterizing the inflation and stall phenomena. Overall, the instrumentation may be applied straightforwardly as a flight-test equipment, and it can be further converted into collapse alert and prevention systems.

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“…Numerical calculations of the flow over the paraglider wing were previously performed in the sense of geometry influence [21,22] or the position of the inlet to the airstreams [23] on the aerodynamic characteristics, whereas the previous research of the authors of this publication studied the sensitivity of paraglider performance to air permeability material change [24].…”

Section: Introductionmentioning

confidence: 99%

Influence of Material Degradation on Deformation of Paraglider during Flight

et al. 2023

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The aim of this article is to determine experimentally and numerically the influence of material degradation on the deformation of a paraglider during flight. The presented method regards numerical modeling of pressure distribution over the wing and its effect on paraglider behavior; the considerations are preceded by experiments on three types of Polyamide 6.6 paraglider fabrics, subjected and not subjected to thermal, UV and flexing degradation. Scanning electron microscope (SEM) records allowed to determine the structural characteristics of the analyzed samples. Air permeability and mechanical tests are the input data for the computational simulations. When a pressure drop of 200 Pa is applied, all the analyzed samples are impermeable, except for those damaged by flexing. Thus, flexing damage has the greatest influence on the air permeability change among all considered aging factors. Aging caused by UV radiation has the greatest influence on mechanical properties. No major influence of thermal ageing on the mechanical properties of the considered samples is observed. Safety factors of the considered materials not subjected to degradation range between 3.94 and 6.00. Safety factor of fabric no. 1 subjected to the UV degradation is equal to 1.33; this result does not secure a safe usage of the considered material. The methodology described in this research can help to predict paraglider covering materials’ behavior in flight; it assumes many cases, i.e., applying a new material or the material at any point of its life cycle. Thus, the practical implications of this model supported by numerical methods may result in saving time and cost in producing prototypes, as well as potentially assessing the safety of used wings. Future research activity can introduce the application of different elastic–plastic damage models to determine the paraglider behavior during collapse.

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Influence of the air inlet configuration on the performances of a paraglider open airfoil

Cited by 7 publications

References 9 publications

Optimal Aerodynamic Shape Optimization of a Paraglider Airfoil Based on the Sharknose Concept

Optimal Aerodynamic Shape Optimization of a Paraglider Airfoil Based on the Sharknose Concept

Wind-Tunnel Measurement of Differential Pressure on the Surface of a Dynamically Inflatable Wing Cell

Influence of Material Degradation on Deformation of Paraglider during Flight

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