Overview of environmental airflow energy harvesting technology based on piezoelectric effect

With the development of environmental energy harvesting technology, the research focus gradually develops from the energy harvester itself to the energy harvesting system of coupled environmental vibration sources, in which environmental airflow energy harvesting technology based on the piezoelectric effect is an important research direction. Here, the study status and development trend of piezoelectric energy harvesting were reviewed and summarized including rotation types, vortex-induced vibration types, flutter types and resonant types. It was found that the rotational multi-array energy harvesters are easy to scale, and the vortex-induced vibration and the flutter energy harvesters are poor adaptability for wide range of airflow velocity, and the resonant types can effectively improve excitation energy and output power. In order to improve power generation capacity and broaden the range of airflow velocity, energy harvesting with multiple frequency excitation and multi-piezoelectric array are future main development tendencies.