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Experimental study of effects of circular-cross-section riblets on the aerodynamic performance of Risø airfoil at transient flow regime

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Abstract

New drag reduction methods have received much attention due to the importance of drag reduction in airplanes and wind turbines. One of the ways for drag reduction is the use of riblets. We investigated the effects of riblets on the aerodynamic performance of the Risø airfoil quantitatively. By installing a load cell and using the one-sided force measurement method, the drag and lift coefficients of the Risø airfoil were measured in two modes: With and without riblets at three different arrangements. The shape of riblets is a circularcross- section and the ratio of riblets’ diameter to the airfoil chord is equal to 0.005. The tests were carried out in transient flow regime (Two Reynolds numbers of 2.02×105 and 1.4×105), and at attack angles from 0 to 20 degrees. The results indicate that the extent of the riblets effect on the aerodynamic performance of the airfoil depends on the angle of attack, Reynolds number, and arrangement of the riblets on the airfoil. The maximum drag reduction at the Reynolds numbers of 2.02×105 and 1.4×105 is about 29.7 % and 54 %, respectively, that occurs at an attack angle of 7 degrees for both two Reynolds numbers.

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References

  1. C. Bak, M. Gaunaa, P. B. Andersen, T. Buhl, P. Hansen and K. Clemmensen, Wind tunnel test on airfoil Risø-B1-18 with an active trailing edge flap, Wind Energy, 13 (2–3) (2010) 207–219.

    Article  Google Scholar 

  2. F. De Gregorio and G. Fraioli, Flow control on a high thickness airfoil by a trapped vortex cavity, 14th Symposium on Applications of Laser Techniques to Fluid Mechanics, Lisbon, Portugal (2008).

    Google Scholar 

  3. R. Voona, Enhancing the aerodynamic performance of stepped airfoils (2012).

    Google Scholar 

  4. S. A. Prince, V. Khodagolian, C. Singh and T. Kokkalis, Aerodynamic stall suppression on aerofoil sections using passive air-jet vortex generators, AIAA J., 47 (9) (2009) 2232–2242.

    Article  Google Scholar 

  5. C. M. Velte, M. O. L. Hansen, K. E. Meyer and P. Fuglsang, Evaluation of the performance of vortex generators on the DU 91-W2-250 profile using stereoscopic PIV, International Symposium on Energy, Informatics and Cybernetics: Focus Symposium in the 12th World Multiconference on Systemics, Cybernetics and Informatics (2008) 263–267.

    Google Scholar 

  6. J. C. S. Lai and M. F. Platzer, Jet characteristics of a plunging airfoil, AIAA J., 37 (12) (1999) 1529–1537.

    Article  Google Scholar 

  7. K. Choi, Near wall structure of a turbulent boundary layer with riblets, J Fluid Mech., 208 (1989) 417e58.

    Article  Google Scholar 

  8. M. J. Walsh, Turbulent boundary layer drag reduction using riblets, AIAA Paper, 82-0169 (1982).

  9. M. J. Walsh and A. M. Lindemann, Optimization and application of riblets for turbulent drag reduction, AIAA Paper 84-0347, January (1984).

  10. M. J. R. Walsh, Viscous drag reduction in bounday layers, D. M. Bushnell and J. N. Hefner (Ed.), AIAA progress in aeronautics and astronautics, AIAA, Washington, DC, 123 (1990) 203–261.

    Google Scholar 

  11. Y. Li and J. Wang, Experimental studies on the drag reduction and lift enhancement of a delta wing, J. of Aircraft, 40 (2) (2003) 277–281.

    Article  Google Scholar 

  12. O. A. El-Samni, H. H. Chun and H. S. Yoon, Drag reduction of turbulent flow over thin rectangular riblets, International J. of Engineering Science, 45 (2) (2007) 436–454.

    Article  Google Scholar 

  13. L. P. Chamorro, R. E. A. Arndt and F. Sotiropoulos, Drag reduction of large wind turbine blades through riblets: Evaluation of riblet geometry and application strategies, Renewable Energy, 50 (2013) 1095–1105.

    Article  Google Scholar 

  14. A. Sareen et al., Drag reduction using riblet film applied to airfoils for wind turbines, J, of Solar Energy Engineering, 136 (2) (2014) 021007.

    Article  Google Scholar 

  15. J. M. Caram and A. Ahmed, Effect of riblets on turbulence in the wake of an airfoil, AIAA J., 29 (11) (1991) 1769–1770.

    Article  Google Scholar 

  16. M. Han, H. C. Lim, Y.-G. Jang, S. S. Lee and S. J. Lee, Fabrication of a micro-riblet film and drag reduction effects on curved objects, The 12th International Conference on Solid State Sensors, Actuators and Microsystems, 1 (2003) 396–399.

    Article  Google Scholar 

  17. S.-J. Lee and Y.-G. Jang, Control of flow around a NACA 0012 airfoil with a micro-riblet film, Journal of Fluids and Structures, 20 (5) (2005) 659–672.

    Article  Google Scholar 

  18. S. Sundaram, P. R. Viswanath and S. Rudrakumar, Viscous drag reduction using riblets on NACA 0012 airfoil to moderate incidence, AIAA J., 34 (4) (1996) 676–682.

    Article  Google Scholar 

  19. E. Coustols and J. Cousteix, Experimental investigation of turbulent boundary layers manipulated with internal devices: Riblets, Proceedings of the IUTAM Symposium on Structure of Turbulence and Drag Reduction, Berlin, Springer (1990) 577–584.

    Chapter  Google Scholar 

  20. P. R. Viswanath and R. Mukund, Turbulent drag reduction using riblets on a supercritical airfoil at transonic speeds, AIAA J., 33 (5) (1995) 945–947.

    Article  Google Scholar 

  21. J. B. Johansen and C. R. Smith, The effects of cylindrical surface modifications on turbulent boundary layers, AIAA J., 24 (7) (1986) 1081–1087.

    Article  Google Scholar 

  22. P. Fuglsang et al., Wind tunnel tests of Risø-B1-18 and Risø-B1-24 (2003).

    Google Scholar 

  23. F. Bertagnolio, Numerical study of the static and pitching RISØ-B1-18 airfoil (2004).

    Google Scholar 

  24. B. Bhushan, Shark skin surface for fluid-drag reduction in turbulent flow, Biomimetics, Springer Berlin Heidelberg (2012) 227–265.

    Google Scholar 

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Authors and Affiliations

  1. Department of Mechanical Engineering, Isfahan University of Technology, Isfahan, Iran

    Mehrdad Nafar Sefiddashti, Mahdi Nili-Ahmadabadi & Behnam Saeedi Rizi

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  1. Mehrdad Nafar Sefiddashti
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  2. Mahdi Nili-Ahmadabadi
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  3. Behnam Saeedi Rizi
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Corresponding author

Correspondence to Mahdi Nili-Ahmadabadi.

Additional information

Recommended by Associate Editor Hyoung-Bum Kim

Mahdi Nili-Ahmadabadi is an Associate Professor and the faculty member of Mechanical Engineering Department at Isfahan University of Technology. He received his master and Ph.D. degrees from Sharif University of Technology in 2005 and 2010, respectively. His major research interests are inverse design, turbomachinery, experimental aerodynamics, and PIV measurement.

Mehrdad Nafar-Sefiddashti is a B.S. Graduate of Mechanical Engineering Department at Isfahan University of Technology, Iran. His major research interests are experimental hydrodyamics, CFD, and Fluid Mechanics.

Behnam Saeedi Rizi is a B.S. Graduate of Mechanical Engineering Department at Isfahan University of Technology, Iran. His major research interests are experimental aerodynamics and Fluid Mechanics.

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Sefiddashti, M.N., Nili-Ahmadabadi, M. & Rizi, B.S. Experimental study of effects of circular-cross-section riblets on the aerodynamic performance of Risø airfoil at transient flow regime. J Mech Sci Technol 32, 709–716 (2018). https://doi.org/10.1007/s12206-018-0119-z

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  • DOI: https://doi.org/10.1007/s12206-018-0119-z

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