Visualization of Flow Pattern over Cylinders and Cylinder with Cone for Improved Performance of Wind Turbines
K. Ashokachary1, Dr. Chirra Kesava Reddy2, J. Pradeep Kumar3, V. Rajarao4, Ravi Kumar Kotturi5

1K. Ashokachary, Asst. Professor, Department of ME, VJIT, Hyderabad, India.
2Dr. Chirra Kesava Reddy, Principal, Department of ME, SRTIST, Nalgonda.
3J. Pradeep Kumar, Asst. Professor, Department of ME, VJIT, Hyderabad, India.
4V. Rajarao, Asst. Professor, Department of ME, JITS, Narsampet, Warangal.
5Ravi Kumar Kotturi, Asst. Professor, Department of ME, VJIT, Hyderabad, India.
Manuscript received on 02 June 2019 | Revised Manuscript received on 10 June 2019 | Manuscript published on 30 June 2019 | PP: 811-817 | Volume-8 Issue-8, June 2019 | Retrieval Number: F4054048619/19©BEIESP
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Abstract: Wind turbines used in power generation have to deal with the aspect of reducing flow losses. In that case, the power generation systems are expected to have improved performance. Present work discusses one such experimentation to explore the flow over the cylinders and cylinder with cone. The effect of presence of cylinder on stream lines perpendicular to the fluid flow at cylinder is 4 cm from the center line on both sides. Flow gets deviated from its path and as the area increases. After crossing the cylinder center line, as the area decreases the flow gets accelerated and moves to downstream. When flow encounters the cylinders which are in parallel, similar complex features are observed. Fluid diverges from its path and flows over and re-attachment is found at a distance of 4 cm from both the cylinders. Presence of two cylinders causes two attachment points and two recirculation zones. These re-circulating zones at each cylinder rejoin with the free stream flow. Also, the effect on stream lines is up to 1.5cm from each cylinder towards another cylinder. There is formation of convergent section between them and it compresses the fluid as area is reduced, accelerating the flow up to center line of the cylinders. After that, fluid again gets diverged, reduces its velocity and rejoins with the main flow. Similarly, study is made when the cylinders are in series. Thus, results give more insight to the flow over cylinders, which are in parallel and series that find many applications in real time like wind turbines. The above complex behaviors are reduced to great extent when using the cylinder with cone. And it is observed that the vortex size is reduced. And the presence of this object on stream lines perpendicular to the direction is also reduced.
Keyword: Flow over multiple cylinders, Flow separation, Recirculation, Boundary Layer.
Scope of the Article: High Performance Computing.