Investigation of Overlap Ratio for Savonius Type Vertical Axis Hydro Turbine
Patel C.R.1, Patel V.K.2, Prabhu S.V.3, Eldho T.I.4

1Patel C. R, Mechanical Engineering Department, SVMIT, Gujarat Technological University, Bharuch, Gujarat, India.
2Patel V. K., Mechanical Engineering Department, Sardar Vallabhbhai National Institute of Technology, Surat, Gujarat, India.
3Prabh S. V., Mechanical Engineering Department, Indian Institute of Technology, Bombay, Maharastra, India.
4Eltho T.I., Civil Engineering Department, Indian Institute of Technology, Bombay, Maharastra, India.
Manuscript received on April 04, 2013. | Revised Manuscript received on April 28, 2013. | Manuscript published on May 05, 2013. | PP: 379-383 | Volume-3, Issue-2, May 2013. | Retrieval Number: B1572053213/2013©BEIESP
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Abstract: Hydropower from the river is one of the best renewable sources. Hydropower source is predictable compared to wind or solar energy. For generation of electricity using the kinetic energy of natural water resources, Savonius rotor is one of the best types of turbine. The Savonius turbine is more popular as wind turbine. However, in present work, attempt is made for use of Savonius rotor as hydro turbine application. A 3D computational model built and analyzed using a Computational Fluid Dynamic (CFD) analysis using ANSYS. The effect of overlap ratio is investigated for performance enhancement Savonius turbine. In present investigation three different overlap ratios, 0.0, 0.1 and 0.2 are studied, at different angular speeds of rotor. It is found that the maximum torque can be obtained at overlap ratio of 0.2.
Keywords: Overlap ratio, Savonius Turbine, CFD Simulation, Micro hydro turbine, Coefficient of torque, Coefficient of power.