The VAWT
(vertical axis wind turbine) has advantages over HAWT (horizontal axis wind
turbine) that it allows less chance to be degraded independent of wind
direction and turbine can be operated even at the low wind speed. However, VAWT
in urban area generally has weak and turbulent wind conditions due to the
presence of high-rise building. Therefore, VAWT operation under both stalled
and unstalled conditions with various effective angles of attack are also in
the presence of dynamic stall which are particularly significant impact on load
and power the operation at low tip-speed ratio. The objective of this study is
to analyze aerodynamics of the VAWT blade and investigate the ideal shape of
blade. The analysis of aerodynamic characteristics with various blades has been
performed using numerical simulation with CFD software. As the numerical
simulation discloses local physical features around wind turbine, aerodynamic
performance such as lift, drag and torque are computed for single blade
rotation and multiple blade rotation cases. Through this study, an accurate
aerodynamic physic is defined, furthermore, effective blade shape is suggested
based vortex-blade interaction studies.
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