EFFECT OF CROSS SECTIONAL SHAPE VARIATION FOR AN OSCILLATING WING

  • Ferhat Karakaş
  • Onur Paça
  • Cihad Köse
  • Onur Son
  • Berk Zaloğlu
  • İdil Fenercioğlu
  • Okşan Çetiner
Keywords: Oscillating wing, PIV, airfoil profile, force measurements

Abstract

Investigations on the design and applications for Micro Air Vehicles (MAV) attract increasing attention to the fields of study on low Reynolds number flows. Generation of thrust and locomotion mechanism of swimming and flying animals may improve the design and development of engineered systems that take advantage of similar unsteady aerodynamic mechanisms. Biological inspiration offers a means to enhance the performance of the next generation of small-scale air vehicles over existing fixed and rotary wing systems.

A 2D oscillating wing with SD7003 airfoil profile undergoing pitching and plunging motions was investigated in a previous study and the vortical structures were categorized for various flapping parameters. In this study, three-dimensional models (AR=4) with four different airfoil profiles (SD7003, NACA0012, t/c=0.05 rounded edge and t/c=0.05 sharp edge flat plates) are used for the cases where thrust or drag production was qualitatively defined based on flow structures. The study is performed in a water channel at the Reynolds number range of 2,000 < Re < 15,000 using the DPIV (Digital Particle Image Velocimetry) technique and a Force/Torque sensor. Quantitative flow visualization results are obtained for three different planes along the span of the test models. The results reveal the time dependent relation between the vortical structures and the forces acting on the test models. The effect of using various airfoil profiles on the vortical structures and thrust/drag production is also investigated.

References

[1] Jones, K.D., Dohring, C.M., Platzer, M.F., (1998) “Experimental and computational investigation of the Knoller-Betz effect”, AIAA Journal, 36 (7), 1240-1246.
[2] Kramer, M., (1932) “Increase in the maximum lift of an airfoil due to a sudden increase in its effective angle of attack resulting from a gust”, NASA TM 678.
[3] McCroskey, W.J., (1982) “Unsteady airfoils”, Annual Review Fluid Mechanics, 14, 285–311.
[4] Carr, L.W., (1988) “Progress in analysis and prediction of dynamic stall”, Journal of Aircraft, 25(1), 6-17.
[5] Koochesfahani, M.M., (1989) “Vortical pattern in the wake of an oscillating airfoil”, AIAA Journal, 27, 1200-1205.
[6] Ohmi, K., Coutanceau, M., Loc, T.P. ve Delieu, A., (1990) “Vortex formation around an oscillating and translating airfoil at large incidences”, Journal of Fluid Mechanics, 211, 37-60.
[7] Ohmi, K., Coutanceau, Daube, O., M., Loc, T.P., (1991) “Further experiments on vortex formation around an oscillating and translating aerofoil at large incidences”, Journal of Fluid Mechanics, 225, 607–630.
[8] Panda, J., Zaman, K.B.M.Q., (1994) “Experimental investigation of the flow field of an oscillating airfoil and estimation of lift from wake survey”, Journal of Fluid Mechanics, 265, 65–95.
[9] Lai, J.C.S., Platzer, M.F., (1999) “Jet characteristics of a plunging airfoil”, AIAA Journal, 37(12), 1529-1537.
[10] Heathcote, S., Gursul, I., (2007) “Jet switching phenomenon for a periodically plunging airfoil”, Physics of Fluids, 19, 027104.
[11] Triantafyllou, M.S., Techet, A.H., Hover, F.S., (2004) “Review of experimental work in biomimetic foils”, IEEE Journal of Oceanic Engineering, 29(3), 585-594.
[12] Anderson, J.M., Streitlien, K., Barrett, D.S., Triantafyllou, M.S., (1998) “Oscillating foils of high propulsive efficiency”, Journal of Fluid Mechanics, 360, 41-72.
[13] Triantafyllou, M.S., Triantafyllou, G.S., Gopalkrishnan, R., Wake mechanics for thrust generation in oscillating foils, Physics of Fluids, Letters, A 3(12), 2835-2837, (1991).
[14] Young, J., Lai, C.S. Mechanisms influencing the efficiency of oscillating airfoil propulsion, AIAA Journal, 45(7), 1695-1702, (2007).
[15] Read, D.A., Hover, F. S., Triantafyllou M. S., (2003) “Forces on oscillating foils for propulsion and maneuvering”, Journal of Fluids and Structures, 17, 163–183.
[16] Hover, F.S., Haugsdal,O., Triantafyllou, M.S., (2004) “Effect of angle of attack profiles in flapping foil propulsion”, Journal of Fluids and Structures, 19, 37–47.
[17] Fenercioglu, I., Cetiner, O., (2012) “Categorization of Flow Structures around a Pitching and Plunging Airfoil”, Journal of Fluids and Structures, 31, 92-102.
[18] Windte, J., Scholz, U., Radespiel, R., (2006) “Validation of the RANS-simulation of laminar separation bubbles on airfoils”, Aerospace Science and Technology, 10, 484-494.
[19] Ol, M.V., Bernal, L., Kang, C-K, Shyy, W., (2009) “Shallow and deep dynamic stall for flapping low Reynolds number airfoils”, Experiments in Fluids, 46(5), 883-901.
[20] Bernal, L., Ol, M.V., Szczublewski, D.P., Cox, C.A., (2009) “Unsteady Force Measurements in Pitching-Plunging Airfoils”, 39th AIAA Fluid Dynamics Conference, AIAA 2009-4031.
[21] Rival D., Tropea, C., (2009) “Characteristics of Pitching and Plunging Airfoils under Dynamic-Stall Conditions”, 47th AIAA Aerospace Sciences Meeting Including The New Horizons Forum and Aerospace Exposition, AIAA 2009-537.
[22] von Ellenrieder, K. D., Parker, K., Soria, J., (2003) “Flow Structures Behind a Heaving and Pitching Finite-span Wing”, Journal of Fluid Mechanics, 490, 129-138.
[23] Dong, H., Mittal, R., Najjar, F. M., (2006) “Wake topology and hydrodynamic performance of low-aspect-ratio flapping foils”, Journal of Fluid Mechanics, 566, 309-343.
[24] Ol, M. V., (2007) “Vortical Structures in High Frequency Pitch and Plunge at Low Reynolds Number”, 37th AIAA Fluid Dynamics Conference and Exhibit, AIAA 2007-4233.
[25] Lian, Y., (2009) “Numerical Investigation of Boundary Effects on Flapping Wing Study”, 47th AIAA Aerospace Sciences Meeting Including The New Horizons Forum and Aerospace Exposition, AIAA 2009-539.
[26] Usoh, C.O., Young, J., Lai, J.C.S., Ashraf, M.A., (2012) “Numerical Analysis of a Non-Profiled Plate for Flapping Wing Turbines”, 18th Australasian Fluid Mechanics Conference.
[27] Stevens, P. R. R. J., Babinsky, H., (2014) “Low Reynolds Number Experimental Studies on Flat Plates”, 52nd Aerospace Sciences Meeting, AIAA 2014-0743.
[28] Babinsky, H., Jones, A. R., (2009) “Unsteady Lift Generation on Sliding and Rotating Flat Plate Wings”, 39th AIAA Fluid Dynamics Conference, AIAA 2009-3689.
[29] Ramasamy, M., Lee,T. E., Leishman, J. G., (2007) “Flowfield of a Rotating-Wing Micro Air Vehicle”, Journal of Aircraft, 44 (4), 1236-1244.
[30] Lewin, G. C., Haj-Hariri, H. (2003), “Modelling thrust generation of a two-dimensional heaving airfoil in a viscous flow”, Journal of Fluid Mechanics, 492, 339–362.
[31] Baik, Y. S., Bernal, L. P., Granlund, K., Ol, M. V., (2012) “Unsteady force generation and vortex dynamics of pitching and plunging aerofoils”, Journal of Fluid Mechanics, 709, 37-68.
Published
2014-07-28
How to Cite
[1]
F. Karakaş, “EFFECT OF CROSS SECTIONAL SHAPE VARIATION FOR AN OSCILLATING WING”, JAST, vol. 7, no. 2, pp. 55-70, Jul. 2014.
Section
Articles