[American Institute of Aeronautics and Astronautics 51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition - Grapevine (Dallas/Ft. Worth Region), Texas ()] 51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition - An Experimental Investigation into the Influence of Unsteady Wind on the Aerodynamic Performance of a Vertical Axis Wind Turbine