Journal of the Korean Society of Visualization (한국가시화정보학회지)

The Korean Society of Visualization (한국가시화정보학회)
권호 표지
DOI QR코드

DOI QR Code

Flow Characteristics of a Paraglider Canopy with Leading-edge Tubercles

선단돌기가 적용된 패러글라이더 캐노피의 유동특성 연구

  • Shin, Jeonghan (Department of Mechanical Engineering, Ulsan National Institute of Science and Technology) ;
  • Chae, Seokbong (Department of Mechanical Engineering, Ulsan National Institute of Science and Technology) ;
  • Shin, Yisu (Department of Mechanical Engineering, Ulsan National Institute of Science and Technology) ;
  • Park, Jungmok (Gin Gliders) ;
  • Song, Ginseok (Gin Gliders) ;
  • Kim, Jooha (Department of Mechanical Engineering, Ulsan National Institute of Science and Technology)
  • Received : 2021.11.26
  • Accepted : 2021.12.16
  • Published : 2021.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

In the present study, we investigate the flow characteristics of a paraglider canopy with leading-edge tubercles by performing force measurement and surface flow visualizations. The experiment is conducted at Re = 3.3×105 in a wind tunnel, where Re is the Reynolds number based on the mean chord length and the free-stream velocity. The canopy model with leading-edge tubercles has flow characteristics of a two-step stall, showing an earlier onset of the first stall than the canopy model without leading-edge tubercles. However, the main stall angle of the tubercled model is much larger than that of the canopy model without tubercles, resulting in a higher aerodynamic performance at high angles of attack. The delay in the main stall is ascribed to the suppression of separation bubble collapse around the wingtip at high angles of attack.

Keywords

Acknowledgement

본 연구는 문화체육관광부의 스포츠 선도기업 핵심기술개발사업에 의거 국민체육진흥공단의 국민체육진흥기금 (S202101-05-01-02)을 지원받아 수행되었으며, 이에 감사드립니다.

References

  1. "Paraglider", Federation of Korea Aeronautics, 12 November 2020, "http://www.fkaero.or.kr/".
  2. Babinsky, H., 1999, "The Aerodynamic Performance of Paragliders," The Aeronautical Journal, Vol. 103, No. 1027, pp. 421-428. https://doi.org/10.1017/S0001924000027974
  3. Abdelqodus, A. A. and Innokentiy A. K., 2018, "Optimal Aerodynamic Shape Optimization of a Paraglider Airfoil Based on the Sharknose Concept," MATEC Web of Conferences. EDP Sciences, Vol. 221.
  4. "Nova Performance Paragliders", 18 November 2021, https://www.nova.eu/en/innovation/air-scoop/
  5. Miklosovic, D. S., Murray, M. M., Howle, L. E., & Fish, F. E., 2004, "Leading-edge tubercles delay stall on humpback whale (Megaptera novaeangliae) flippers," Physics of Fluids, Vol. 16(5), pp 39-42. https://doi.org/10.1063/1.1629128
  6. Howle, L. E., 2009, "Whalepower Wenvor Blade: A report on the efficiency of a whalepower corp. 5 meter prototype wind turbine blade," BelleQuant Engineering, PLLC.
  7. Kim, H., Kim, J. and Choi, H., 2018, "Flow Structure Modifications by Leading-edge Tubercles on a 3D Wing," Bioinspiration & Biomimetics, Vol. 13(6).
  8. Becker, S., 2017, "Experimental Study of Paraglider Aerodynamics," Master of Science Thesis, Imperial College London.
  9. Boutilier, M. S. and Yarusevych, S., 2012, "Effects of End Plates and Blockage on Low-Reynoldsnumber Flows over Airfoils," AIAA Journal, Vol. 50 (7), pp. 1547-1559. https://doi.org/10.2514/1.J051469
  10. Cai, C., Zuo, Z., Morimoto, M., Maeda, T., Kamada, Y. and Liu, S., 2018, "Two-step Stall Characteristic of an Airfoil with a Single Leadingedge Protuberance," AIAA Journal, Vol. 56(1), pp. 64-77. https://doi.org/10.2514/1.J055921
  11. Chen, Z. J., Qin, N. and Nowakowski, A. F., 2013, "Three-Dimensional Laminar-Separation Bubble on a Cambered Thin Wing at low Reynolds numbers," Journal of Aircraft, Vol. 50(1), pp. 152-163. https://doi.org/10.2514/1.C031829
  12. Hansen, K. L., Kelso, R. M., Choudhry, A. and Arjomandi, M., 2014, "Laminar Separation Bubble Effect on the Lift Curve Slope of an Airfoil," 19th Australasian Fluid Mechanics Conference, Melbourne, Australia, pp. 8-11.
  13. Arivoli, D., Singh, I. and Suriyanarayanan, P., 2020, "Rudimentary Emulation of Covert Feathers on Low-AR Wings for Poststall Lift Enhancement, AIAA Journal," Vol. 58(2), pp. 501-516. https://doi.org/10.2514/1.j058562