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An aeroelastic flutter based electromagnetic energy harvester with wind speed augmenting funnel

This paper investigates the efficiency of wind speed augmenting funnel incorporated with an aero-elastic-flutter based, energy harvester. Flutter phenomenon has been used to convert wind flow energy into mechanical vibration, which is then transformed into electrical power. However, aero-elastic flutter initiates only when the wind speed is over a certain flutter onset speed and the wind flow direction is nearly perpendicular to the device, which limits continuous power generation. A wind-flow-contracting funnel device is designed to direct the wind flow to the flutter device and magnify the wind speed. The preliminary CFD analysis and wind tunnel test show that the funnel can magnify wind speed by approximately 20 % within an incident angle of 30 degrees, which leads to an increase in the voltage output of the device.