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

Subject Areas : Mechanical Engineering

A.B. Khoshnevis ¹ , AmirReza Mamouri ² , AmirReza Mamouri ³ , V. Barzenoni ⁴

1 - Department of Mechanical Engineering, University of Hakim Sabzevari, Iran
2 - Engineering Faculty, Eshragh Institute of higher Education, Bojnourd, Iran
3 - Engineering Faculty, Eshragh Institute of higher Education, Bojnourd, Iran
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.

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