Simulation study on the performance of vertical axis wind turbine
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. Howev...
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| Format: | Thesis |
| Published: |
2013
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/3726/ http://eprints.uthm.edu.my/3726/1/NOR_AFZANIZAM_SAMIRAN_1.pdf |
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| Summary: | 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. |
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