Experimental Investigation of Three-Dimensional Multi-Directional Piezoelectric Wind Energy Harvester

Area of Science:

• Renewable Energy Harvesting
• Piezoelectric Transducers
• Mechanical Engineering

Background:

• Wireless sensor nodes require efficient and reliable power sources.
• Traditional wind energy harvesters struggle with unpredictable wind directions.
• Piezoelectric materials offer a promising avenue for vibration energy harvesting.

Purpose of the Study:

• To propose and evaluate a three-dimensional multi-directional piezoelectric wind energy harvester (WEH).
• To investigate the harvester's performance across various wind directions and speeds.
• To provide an experimental foundation for future advancements in omnidirectional WEHs.

Main Methods:

• Designed and fabricated a novel lampshade-shaped piezoelectric wind energy harvester using 3D printing.
• Employed three internal piezoelectric composite beams to support the bluff body.
• Conducted systematic wind tunnel experiments to assess multi-directional energy harvesting capabilities.

Main Results:

• The prototype successfully harvested wind energy from all directions in three-dimensional space.
• Demonstrated consistent performance with a minimum to maximum total average output power ratio of approximately 0.84 at 15 m/s wind speed during horizontal plane direction changes.
• Confirmed the device's adaptability to varying wind conditions.

Conclusions:

• The developed three-dimensional multi-directional piezoelectric wind energy harvester is effective for capturing energy from omnidirectional winds.
• The findings support the viability of this design for powering wireless sensor nodes in variable natural environments.
• This research lays crucial groundwork for the future development of advanced, multi-directional wind energy harvesting systems.