Abstract
The work investigates the effect of turbulent intensity (T u ) on the force and wake of a NACA0012 airfoil at chord Reynolds number Re c = 5.3 × 103 and 2 × 104. Lift and drag coefficients (C L and C D ) on and flow fields around the airfoil were measured with T u varied from 0.6 to 6.0 %. Four Re c regimes are identified based on the characteristics of the maximum lift coefficient (C L, max), i.e., ultra-low (Re c < 104), low (104 ~ 3 × 105), moderate (3 × 105 ~ 5 × 106), and high (> 5 × 106). It is noted that at Re c = 5.3 × 103 (ultra-low Re c regime) the stall is absent for T u = 0.6 % but occurs for T u = 2.6 and 6.0 %. As Re c increases to low Re c regimes, the T u influence decreases. So does the critical Re c , above which stall occurs. The effect of increasing T u on flow bears similarity to that of increasing Re c , albeit with a difference; the flow separation point shifts upstream with increasing Re c but downstream with increasing T u .
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Akbari M, Price S (2003) Simulation of dynamic stall for a NACA 0012 airfoil using a vortex method. J Fluid Struct 17(6):855–874
Alam MM, Zhou Y, Yang HX, Guo H, Mi J (2010) The ultra-low Reynolds number airfoil wake. Exp Fluids 48(1):81–103
Carmichael B (1981) Low Reynolds number airfoil survey. NASA CR-165803
Chen JM, Choa C-C (1999) Freestream disturbance effects on an airfoil pitching at constant rate. J Aircraft 36(3):507–514
Cleaver DJ, Wang Z, Gursul I, Visbal MR (2011) Lift enhancement by means of small-amplitude airfoil oscillations at low Reynolds numbers. AIAA J 49(9):2018–2033
Grager T, Rothmayer A, Hu H (2011) Stall suppression of a low-Reynolds-number airfoil with a dynamic burst control plate. In: Proceedings of 49th AIAA aerospace sciences meeting including the New Horizons forum and aerospace exposition, 04 Jan, Orlando, Florida
Huang RF, Lin CL (1995) Vortex shedding and shear-layer instability of wing at low-Reynolds numbers. AIAA J 33(8):1398–1403
Lee T, Gerontakos P (2004) Investigation of flow over an oscillating airfoil. J Fluid Mech 512:313–341
Sant R, Ayuso L (2011) Aerodynamic study of airfoils geometric imperfections at low Reynolds number. In: Proceedings of 13th international conference on wind engineering, 10–15 Jul, Amsterdam, The Netherlands
Schlüter JU (2009) Lift enhancement at low Reynolds numbers using pop-up feathers. In: Proceedings of 39th AIAA fluid dynamics conference, 25 June, San Antonio, Texas
Sunada S, Kawachi K, Yasuda K, Yasuda T (2002) Comparison of wing characteristics at an ultralow Reynolds number. J Aircraft 39(2):331–338
Wong C, Kontis K (2007) Flow control by spanwise blowing on a NACA 0012. J Aircraft 44(1):338–341
Acknowledgments
YZ wishes to acknowledge support given to him from Research Grants Council of HKSAR through grant B-Q33J.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2014 Springer-Verlag Berlin Heidelberg
About this paper
Cite this paper
Wang, S., Zhou, Y., Alam, M.M., Yang, H.X. (2014). Turbulent Intensity Effect on Low Reynolds Number Airfoil Wake. In: Zhou, Y., Liu, Y., Huang, L., Hodges, D. (eds) Fluid-Structure-Sound Interactions and Control. Lecture Notes in Mechanical Engineering. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-40371-2_29
Download citation
DOI: https://doi.org/10.1007/978-3-642-40371-2_29
Published:
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-40370-5
Online ISBN: 978-3-642-40371-2
eBook Packages: EngineeringEngineering (R0)