Piezoelectric Wind-Energy-Harvesting Device with Reed and Resonant Cavity

Abstract

A wind-energy-harvesting device utilizing the principle of a harmonica was created. A reed in a resonant cavity vibrated efficiently with the blowing wind, and a piezoelectric element stuck on the reed generated electricity. The dimensions of the wind inlet were approximately 30×20 mm². The device was investigated with a wind speed ranging from 2.8 to 10 m/s. An output power of 0.5–4.5 mW was obtained with a matching load of 0.46 MΩ. The energy conversion efficiency of the device could reach up to 2.4%.