Simulation study on the performance of vertical axis wind turbine

Samiran, Nor Afzanizam (2013) Simulation study on the performance of vertical axis wind turbine. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

Nowadays, people start to think the Drag type of vertical axis wind turbine (VAWT) as a potential and reliable wind machine in the future. It advantageous of simpler and significantly cheap to build and maintain than conventional Horizontal axis wind turbine (HAWT) attract the world attention. However, such rotor is suffering from poor efficiency problems. The present study will consider the design improvement of Savonius rotor, which is the basic geometry of drag machine, as a critical step to increase the efficiency of output power. Investigation is conducted to study the effect of geometrical configuration on the performance of the rotor in terms of coefficient of torque, coefficient of power and power output. There are three different types of modification; number of blades variable, shielding method and combination of both configuration. Computerized Fluid Dynamics (CFD) simulation is conducted to analyze the flow characteristic of all the rotor types. The continuity and Reynolds Averaged Navier-Stokes (RANS) equations and realizable k- E epsilon turbulence model are numerically solved by commercial software Ansys-Fluent 14.0. Simulation computed the pressure and velocity field of the flow and the force acting on the rotor blades. The resultant force, pressure and torque coefficient obtained will be used to calculate power coefficient and power output. The results obtained by transient and steady method for the conventional two bladed Savonius rotor are in agreement with those obtained experimentally by other authors and this indicates that the method can be successfully used for such analysis. The modified 3 and 4 bladed rotors with hybrid shielding method give the highest maximum power coefficient which 0.37 at TSR 0.5.

Item Type:Thesis (Masters)
Subjects:T Technology > TJ Mechanical engineering and machinery > TJ807-830 Renewable energy sources
ID Code:3726
Deposited By:Normajihan Abd. Rahman
Deposited On:15 May 2013 16:34
Last Modified:15 May 2013 16:34

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