Numerical Study to Improve the Performance of a Vertical Axis Wind Turbine by Applying a Wind Tower
Since a wind tower can increase the wind velocity as well as adjust the wind direction, the performance of a
vertical axis wind turbine (VAWT) can be augmented. However, it is very important to correctly determine the configuration
of the wind tower because the wind tower can also interrupt the wind flow towards the wind turbine. Hence, a numerical
analysis was conducted to investigate an effective wind tower configuration using computational fluid dynamics (CFD). For
practical reasons, a numerical algorithm using a reduced computational domain was applied because the full threedimensional
CFD required huge amounts of computation time for a transient analysis. This method was validated using
experiment results, and was then applied to the computation of a wind tower with an installed VAWT. Three wind tower
design parameters were chosen for investigation, the inner radius, outer radius, and relative angle of the guide wall. When
these parameters were correctly determined, the wind tower always increased the performance of the VAWT in an
omnidirectional wind. In addition, the maximum power coefficient was increased up to more than 67% compared with that
without the wind tower.
Keywords - Wind turbine, Vertical Axis Wind Turbine, CFD, Performance Enhancement, Wind Tower.