Experimental Investigation of the Flow Control of Wake Cylinder by a Plate with Different Geometrical Ends

Subject Areas : Mechanical Engineering

A.B.  Khoshnevis ¹ (Department of Mechanical Engineering, University of Hakim Sabzevari, Iran)
AmirReza  Mamouri ² (Engineering Faculty, Eshragh Institute of higher Education, Bojnourd, Iran)
AmirReza  Mamouri ³ (Engineering Faculty, Eshragh Institute of higher Education, Bojnourd, Iran)
V.  Barzenoni ⁴ (Department of Mechanical Engineering, University of Hakim Sabzevari, Iran)

Received: 2015-05-07 Accepted : 2017-10-31 Published : 2016-06-01

Keywords: Turbulence intensity, Strouhal number, Cylinder, Drag coefficient,

Abstract :

An experimental study was carried out on the wake of a cylinder on the back of which a plate is installed parallel to the fluid flow, with different terminal angles, where the Reynolds number is 50000. At the end of the plate, blades with the height of 0.25 equal to the cylinder diameter and with 45, 90 and 135 degrees angle from the horizon, are installed where the cylinder diameter is equal to the plate length. The plate effects on the variation of drag coefficient, medium velocity profiles, reduced velocity, half of the entrance, turbulence intensity and Strouhal number are investigated. The results showed that the drag coefficient for cylinder including the plate, regardless of the end angle, is smaller than the isolated cylinder. The existence of a plate with a terminal angle of 45 degree led to more reduction in drag coefficient of the cylinder.

References:

[1]       Blevins, R. D., “Acoustic Modes of Heat Exchanger Tube Bundles”, 1985, Journal of sound and Vibration, Vol. 109, No. 1, 1986, pp. 19-31.

[2]       Hamma, J. C. L., Paranthoen, P., “The control of vortex shedding behind heated circular cylinders at low Reynolds numbers”, Journal of Experiments in Fluids, Vol. 10, 1991, pp. 224-229.

[3]       Bayazitoglu, Y., Sunryanaratana, P. V. R., “Dynamics of oscillating viscous droplests immersed in viscous media”, Journal of Acta Mechanica, Vol.  95, Texas 1992, pp. 167-183.

[4]       Framsson, J. H. M., Konieczny, P., and Alfredsson, P. H., “Flow around a porous cylinder subject to continuous suction or blowing”, Journal of Fluids and Structures, Vol.  19, 2004, pp. 1031-1048.

[5]       Zhijin, Li, Navon, I. M., Hussaini, M.Y., and Le Dimet, F.-X., “Optimal control of cylinder wakes via suction and blowing”, Journal of Computers & Fluids, Vol. 32, 2003, pp. 149-171.

[6]       Mutschke, G., Shatrov, V., and Gerbeth, G., “Cylinder wake control by magnetic fields in liquid metal flows”, Journal of Experimental Thermal and Fluid Science, Vol. 16, 1998, pp. 92-99.

[7]       Igbalajobi, A., McClean, J. F., Sumnern, D., and Bergstrom, D. J., “The effect of a wake-mounted splitter plate on the flow around a surface mounted finite-height circular cylinder”, Journal of Fluids and Structures, Vol.  37, 2013, pp. 185–200.

[8]       Yu, P., Zeng, Y., Lee, T. S., Bai, H. X., and Low, H. T., “Wake structure for flow past and through a porous square cylinder”, International Journal of Heat and Fluid Flow, Vol. 31, 2010, pp. 141–153.

[9]       Bergmann, M., Cordier, L., “Optimal control of the cylinder wake in the laminar regime by trust-region methods and POD reduced-order models”, Journal of Computational Physics, Vol. 227, 2008, pp. 7813–7840.

[10]    Salari. M, Ardakani. M. A., and Taghavi Zonnor, R., “Experimental Study for Effect of Free Flow Temperature Changes and Hot Wire Anemometer on sensors calibration and Velocity measurement”, Journal of Mechanics and AeroSpace, 1384, Vol. 1, No. 3, pp. 49-59 (in Persian). 

[11]    Ardakani, M. A., “Hot Wire Anemometer”, Vol. 1, Khaje Nasiroddin Tosi University, 1385 (in Persian). 

[12]    Saha, A. K., Muralidhar, K., and Biswas, G., “Experimental Study of Flow Past a Square Cylinder at High Reynolds Numbers”, Experiments in Fluids, Vol. 29, No. 4, 2008, pp. 553-563.

[13]    Shadaram A., Azimifrad, M., and Rostami, N., “Study of characteristic flow at the near wake of square cylinder”, J. of Mechanical- aerospace Vol. 3, No. 4, 1386 (in persain).

[14]    Goldstein, S., “A Note on the Measurement of Total Head and Static Pressure on a Turbulent Stream”, Proceedings of the Royal Society of London, Series A, Vol. 155, No. 32, 1936, pp. 570-575.

[15]    LU, B., Bragg, M. B., “Experimental Investigation of the Wake-Survey Method for a Bluff Body with Highly Turbulent Wake”, AIAA-3060, Year 2002.

[16]    LU, B., Bragg, M. B., “Experimental Investigation of Airfoil Drag Measurements with Simulated Leading-Edge Ice Using the Wake-Survey Method”, AIAA3919, Year 2000.

[17]    LU, B., Bragg, M. B., “Airfoil Drag Measurement with Simulated Leading Edge Ice Using the Wake-Survey Method”, AIAA1094, Year 2003.

[18]    Van Dam, C. P., “Recent Experience with Different Methods of Drag Prediction”, Progress in aerospace. Science, Vol. 35, No. 8, 1999, pp. 751-798.

[19]    Sanieinejad, M., “Fundamentals of Turbulent Flows and Turbulence modeling”, daneshnegar publisher, 978-964-2927-35-337, Tehran 1388 (in Persian).

[20]    Wang, J. S., Qiao, X. Q., “Pressure distribution, Fluctuating Forces and vortex shedding behavior of circular cylinder with rotatable splitter plates”, Journal of Fluids and Structures, Vol. 12, 2012, pp. 263-278.

[21]    Fox, R., Mcdonald, A., “Introduction to fluid mechanics”, 4th Ed.