Comparative Study on the Effect of Leading Edge Protuberance of Different Shapes on the Aerodynamic Performance of Two Distinct Airfoils

Document Type : Regular Article

Authors

Department of Mechanical Engineering, NITK Surathkal, Mangalore – 575025, Karnataka, India

Abstract

This study investigated the effect of leading-edge protuberances on the aerodynamic performance of two distinct airfoils with low Reynold’s number (Re): E216 and SG6043. Three protuberance shapes, namely sinusoidal, slot, and triangular, were considered. The amplitudes (A) of protuberances considered were 0.03c, 0.06c, and 0.11c, and the wavelengths (W) were 0.11c, 0.21c, and 0.43c, where c is the chord of the airfoil. The numerical and experimental analyses were performed in the angle of attack (AoA) range of 0° to +20° at and Re of 105. The numerical investigation was performed using the commercial computational fluid dynamics package ANSYS FLUENT. The SST k-ɷ model was used to simulate turbulent flow. The experimental force measurements were conducted using a highly sensitive three-component force balance in a subsonic wind tunnel facility. The flow physics was analyzed using vorticity contours in streamwise and spanwise slices and static pressure distribution contours. The smoke flow visualization technique was used to observe flow streamlines, boundary layer separation, and reattachment over the airfoil surface. The result indicated that the triangular and slot protuberances were the most beneficial for improving poststall lift and reducing skin friction drag. The operating mechanism involved a shift in pressure distribution due to leading-edge alterations and flow energization by secondary flow emanating from the protuberances.

Keywords

References

Bolzon, M. D., R. M. Kelso and M. Arjomandi (2017). Force measurements and wake surveys of a swept tubercled wing. Journal of Aerospace Engineering 30(3), 04016085.##
Cai, C., Z. Zuo, S. Liu and Y. Wu (2015). Numerical investigations of hydrodynamic performance of hydrofoils with leading-edge protuberances. Advances in Mechanical Engineering 7(7), 1687814015592088.##
Carreira Pedro, H. and M. Kobayashi (2008). Numerical study of stall delay on humpback whale flippers. In 46th AIAA aerospace sciences meeting and exhibit. p. 584.##
Chaudhary, M. K. C. M. and S. Prakash (2021). Experimental Investigations of Small horizontal axis wind turbine rotors. Journal of Engineering Research 10(3B).##
Chen, T. Y. and L. R. Liou (2011). Blockage corrections in wind tunnel tests of small horizontal-axis wind turbines. Experimental Thermal and Fluid Science 35(3), 565-569.##
Corsini, A., G. Delibra and A. G. Sheard (2013). On the role of leading-edge bumps in the control of stall onset in axial fan blades. Journal of Fluids Engineering 135(8).##
Custodio, D. (2007). The effect of humpback whale-like leading edge protuberances on hydrofoil performance. Worcester Polytechnic Institute, 75.##
Custodio, D., C. W. Henoch and H. Johari (2015). Aerodynamic characteristics of finite span wings with leading-edge protuberances. AIAA Journal 53(7), 1878-1893.##
Drela, M. and H. Youngren (2001). XFOIL 6.94 user guide.##
Eleni, D. C., T. I. Athanasios and M. P. Dionissios (2012). Evaluation of the turbulence models for the simulation of the flow over a National Advisory Committee for Aeronautics (NACA) 0012 airfoil. Journal of Mechanical Engineering Research 4(3), 100-111.##
Esmaeili, A., H. E. C. Delgado and J. M. M. Sousa (2018). Numerical simulations of low-Reynolds-number flow past finite wings with leading-edge protuberances. Journal of Aircraft 55(1), 226-238.##
Fernandes, I., Y. Sapkota, T. Mammen, A. Rasheed, C. Rebello and Y. H. Kim (2013). Theoretical and experimental investigation of leading edge tubercles on the wing performance. In 2013 Aviation Technology, Integration, and Operations Conference (p. 4300).##
Fish, F. E. (2020). Biomimetics and the application of the leading-edge tubercles of the humpback whale flipper. In Flow control through bio-inspired leading-edge tubercles (pp. 1-39). Springer, Cham.##
Fish, F. and G. V. Lauder (2006). Passive and active flow control by swimming fishes and mammals. Annual Review of Fluid Mechanics 38, 193-224.##
Fletcher, N. H. (1975). Mechanics of flight. Physics Education 10(5), 385.##
FLUENT (2014). 15.0. Theory Guide.##
Gawad, A. F. A. (2013). Utilization of whale-inspired tubercles as a control technique to improve airfoil performance. Transaction on Control and Mechanical Systems 2(5), 212-218.##
Godard, G. and M. Stanislas (2006). Control of a decelerating boundary layer. Part 1: Optimization of passive vortex generators. Aerospace Science and Technology 10(3), 181-191.##
Guerreiro, J. L. E. and J. M. M. Sousa (2012). Low-Reynolds-number effects in passive stall control using sinusoidal leading edges. AIAA Journal 50(2), 461-469.##
Gupta, R. K., V. Warudkar, R. Purohit and S. S. Rajpurohit (2017). Modeling and aerodynamic analysis of small scale, mixed airfoil horizontal axis wind turbine blade. Materials Today: Proceedings 4(4), 5370-5384.##
Hansen, K. L., R. M. Kelso and B. B. Dally (2011). Performance variations of leading-edge tubercles for distinct airfoil profiles. AIAA Journal 49(1), 185-194.##
Jin, W. and Y. G. Lee (2015). Drag reduction design for a long-endurance electric powered UAV. International Journal of Aeronautical and Space Sciences 16(2), 311-324.##
Johari, H., C. Henoch, D. Custodio and A. Levshin (2007). Effects of leading-edge protuberances on airfoil performance. AIAA Journal 45(11), 2634-2642.##
Joseph, J., A. Sathyabhama and S. Sridhar (2022). Experimental and numerical analysis of humpback whale inspired tubercles on swept wings. Aircraft Engineering and Aerospace Technology.##
Kline, S. J. (1953). Describing uncertainty in single sample experiments. Mechanical Engineering 75, 3-8.##
Menter, F. R., M. Kuntz and R. Langtry (2003). Ten years of industrial experience with the SST turbulence model. Turbulence, Heat and Mass Transfer 4(1), 625-632.##
Miklosovic, D. S., M. M. Murray and L. E. Howle (2007). Experimental evaluation of sinusoidal leading edges. Journal of Aircraft 44(4), 1404-1408.##
Miklosovic, D. S., M. M. Murray, L. E. Howle and F. E. Fish (2004). Leading-edge tubercles delay stall on humpback whale (Megaptera novaeangliae) flippers. Physics of Fluids 16(5), L39-L42.##
New, T. H., Z. Y. Wei and Y. D. Cui (2015). On the effectiveness of leading-edge modifications upon cambered SD7032 wings. In Conference proceedings of 10th Pacific symposium on flow visualization and image processing, Naples, Italy.##
Patankar, S. V. (2018). Numerical heat transfer and fluid flow. CRC press.##
Polhamus, E. C. (1968). Application of the leading-edge-suction analogy of vortex lift to the drag due to lift of sharp-edge delta wings. National Aeronautics and Space Administration.##
Roskam, J. and C. T. E. Lan (1997). Airplane aerodynamics and performance. DAR corporation.##
Rostamzadeh Torghabeh, N., R. Kelso, B. Dally and K. Hansen (2013). The effect of undulating leading-edge modifications on NACA 0021 airfoil characteristics. Physics of Fluids 25(11), 1-19##
Schreck, S. J., N. N. Sørensen and M. C. Robinson (2007). Aerodynamic structures and processes in rotationally augmented flow fields. Wind Energy: An International Journal for Progress and Applications in Wind Power Conversion Technology 10(2), 159-178.##
Siram, O., N. Sahoo and U. K. Saha (2022). Wind tunnel tests of a model small-scale horizontal-axis wind turbine developed from blade element momentum theory. Journal of Energy Resources Technology 144(6).##
Skillen, A., A. Revell, J. Favier, A. Pinelli and U. Piomelli (2013). Investigation of wing stall delay effect due to an undulating leading edge: An LES study. In Eighth International Symposium on Turbulence and Shear Flow Phenomena. Begel House Inc.##
Sreejith, B. K. and A. Sathyabhama (2020). Experimental and numerical study of laminar separation bubble formation on low Reynolds number airfoil with leading-edge tubercles. Journal of the Brazilian Society of Mechanical Sciences and Engineering 42(4), 1-15.##
Stanway, M. J. (2008). Hydrodynamic effects of leading-edge tubercles on control surfaces and in flapping foil propulsion (Doctoral dissertation, Massachusetts Institute of Technology).##
Van Nierop, E. A., S. Alben and M. P. Brenner (2008). How bumps on whale flippers delay stall: an aerodynamic model. Physical Review Letters 100(5), 054502.##
Versteeg, H. K. and W. Malalasekera (2007). An introduction to computational fluid dynamics: the finite volume method. Pearson education.##
Weber, P. W., L. E. Howle and M. M. Murray (2010). Lift, drag, and cavitation onset on rudders with leading-edge tubercles. Marine Technology and SNAME News 47(01), 27-36.##
Wei, Z., T. H. New and Y. D. Cui (2018). Aerodynamic performance and surface flow structures of leading-edge tubercled tapered swept-back wings. AIAA Journal 56(1), 423-431.##
Zhang, M. M., G. F. Wang and J. Z. Xu (2013). Aerodynamic control of low-Reynolds-number airfoil with leading-edge protuberances. AIAA Journal 51(8), 1960-1971.##
Zhang, M. M., G. F. Wang and J. Z. Xu (2014). Experimental study of flow separation control on a low-Re airfoil using leading-edge protuberance method. Experiments in Fluids 55(4), 1-13.##
Journal of Applied Fluid Mechanics
Volume 16, Issue 1 - Serial Number 69
January 2023
Pages 157-177

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History

  • Received: 30 May 2022
  • Revised: 04 September 2022
  • Accepted: 06 September 2022
  • Available online: 13 November 2022

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