Wing Cell Geometry and Pressure Distribution over The Surface of A Paraglider

The paraglider poses an interesting challenge to the aerodynamics researcher. This paper studies aerodynamic issues involved in the deployment and operation of a paraglider. The surface shape of the paraglider is determined by the pressure distribution in and around the paraglider, the porosity of the fabric, and the presence of cell cross-flow, in addition to the fabric structure and the tensions in the lines at the attachment points. In this studies wind tunnel test of a three dimensional paraglider wing canopy cell model has been performed. Two dimensional (i.e. pressure measurement along the cord length and span wise direction) pressure distributions over the surface have been investigated at different angle of attack, simultaneously wing surface shape profiles has been measured directly. Surface contours of paraglider during operation in a wind tunnel are obtained. The pressure distribution in turn depends on the attitude and the surface shape. It has been observed that the minimum pressure over the surface of the wing increases towards the edges from the central section. Wing end effects also been investigated. There are a certain percentage of upper surfaces affected by the downwash

Keywords:

Paraglider, Aerodynamics Flexible wing, Three dimensional measurements,

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[1] F. M. Rogallo , J. G. Lowry, D. R. Croom, and R.T. Taylor,” Preliminary Investigation of a Paraglider,” NASA TN D-443,1960.
[2] D. E. Hewes,” Free-Flight Investigation of Radio-Controlled Models with Parawing,” NASA TN D-927, 1961.
[3] P.G. Fournier and B.A. Bell,” Low Subsonic Pressure Distributions on Three Rigid Wings Simulating Paragliders With Varied Canopy Curvatures and Leading-Edge Sweep, NASA TN D-983, 1961.
[3] B. Gamse, K. W. Mort, and P. F. Yaggy,” Low-Speed Wind Tunnel Tests of A Large Scale Inflatable Structure Paraglider,” NASA TN D-2859, 1965.
[4] Ware, G.M., Hassell, J.L., “Wind-Tunnel Investigation of Ram-Air-Inflated All-Flexible Wings of Aspect Ratios 1.0 to 3.0”. NASA TM SX-1923, Langley Research Center, Hampton, VA, 1969.
[5] Goodrick, T.F., “Theoretical Study of the Longitudinal Stability of High-Performance Gliding Airdrop Systems”. AIAA Paper 75-1394, 5th Aerodynamic Decelerator Systems Conference,1975.
[6] Goodrick, T.F., “Scale Effects on Performance of Ram Air Wings”. AIAA Paper 84-0783, January 1984.
[7] Brown, G.J., “Tethered Parafoil Test Technique”. AIAA 89-0903-CP, January 1989. [8] C. Matos, R. Mahalingam, G. Ottinger , J. Klapper, R. Funk and N. Komerath,” Wind Tunnel Measurements of Parafoil Geometry and Aerodynamics”, 36th AIAA Aerospace Sciences Meeting,1998.
[9] Gordon Strikert,” Study on the relative motion of parafoil-load-systems”, Aerospace Science and Technology, Elsevier, May 2004.
[10] M. Mashud and A.Umemura,” Experimental Investigation of Aerodynamic Characteristics of a Paraglider Wing”, Transactions of JSASS (submitted)

International Journal of Engineering and Applied Sciences-Cover

Başlangıç: 2009
Yayıncı: Akdeniz Üniversitesi

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