Experimental Study of Frequency Behavior for a Circular Cylinder behind an Airfoil

The interaction between wakes of bluff body and airfoil have profound influences on system performance in many industrial applications, e.g., turbo-machinery and cooling fan. The present work investigates the effect of configuration include; airfoil-s angle of attack, transverse and inline spacing of the models, on frequency behavior of the cylinder-s near-wake. The experiments carried on under subcritical flow regime, using the hot-wire anemometry (HWA). The relationship between the Strouhal numbers and arrangements provide an insight into the global physical processes of wake interaction and vortex shedding.

Authors:

• S. Bajalan
• A. Shadaram
• N. Hedayat
• A. Shams Taleghani

Keywords:

• Airfoil
• Cylinder
• Strouhal
• Wake interaction

References:

[1] M. M. Zdravkovich and D. L. Pridden, "Interference between two
circular cylinders; series of unexpected discontinuities", Journal of
Industrial Aerodynamics 2, 255-270, 1977.
[2] M. M. Zdravkovich, "The effects of interference between circular
cylinders in cross flow", Journal of Fluids and Structures 1, 239-261
(1987).
[3] M. M. Zdravkovich, Flow around Circular Cylinders, Fundamentals,
Oxford Science Publications, Vol. I, 1997.
[4] M. M. Zdravkovich, Flow around Circular Cylinders, Applications,
Oxford Science Publications, Vol. I I, 2003.
[5] O. O. Akosile, and D. Summer, "Staggered Circular Cylinders Immersed
in a Uniform Planar Shear Flow", Journal of Fluids and Structures, 18,
613-633, 2003.
[6] Y. L. Lau, R. M. C. So and R. C. K. Leung, "Flow- Induced Vibration of
Elastic Slender Structures in a Cylinder Wake", Journal of Fluids and
Structures, Vol: 19, 2004.
[7] H. J. Zhang, L. Huang, and Y. Zhou, "Aerodynamic Loading on a
Cylinder behind an Airfoil", Experiments in Fluids, 38, 588-593, 2005.
[8] C. Y. Zhou, C. W. Sun, Y. Zhou, and L. Huang, "A, Numerical Study of
a Circular Cylinder in the Wake of an Airfoil", 15th Australasian Fluid
Mechanics Conference, University of Sydney, Sydney, Australia, 2004.
[9] I. Y─▒ld─▒r─▒m, , O. Cetiner and M. F. Unal, "Wake Interactions for A
Circular Cylinder Behind an Airfoil", 3rd international conference on
vortex flows and vortex models Yokohama, Japan, November 21-23
,2005.
[10] M. Ikehata, T. Inoue, M. Ozawa, and S. Matsumoto, "Experimental
Investigation on Flow Fields of Viscous Fluid around Two-Dimensional
Wings and Comparison with Computational Results", Journal of Marine
Science and Technology 2:62-76, 1997.
[11] C. Tropea, A. L. Yarin and J. F. Foss (Eds.), Springer Handbook of
Experimental Fluid Mechanics, Springer-Verlag Berlin Heidelberg,
2007.