Session: 08-08-02: Design Analysis and Optimization of Energy Conversion Systems - 2

Paper Number: 142818

142818 - Comparative Analysis of Wind Energy Harvesting Performance using Multi-Stage Savonius Turbines with Non-Contact Magnetic Excitation 

Recently, there has been a strong focus on small-scale energy harvesting technologies, which are seen as promising for generating power from environmental sources. Among these technologies, piezoelectric transducers stand out as a strong alternative to electromagnetic counterparts, particularly in small wind energy harvesting. However, current research is mainly centered on optimizing piezoelectric materials and deformation mechanisms, neglecting the critical role of rotor blade design. A deeper investigation is presented here to improve rotor blade performance in increasing wind energy harvesting efficiency, especially in low wind speeds. This addresses the limitations of electromagnetic transducers in small wind energy harvesters. A proposed wind energy harvester design includes a pair of concentric rings with elements for energy scavenging. Rectangular permanent magnetic plates are symmetrically attached to the inner surface of the stator ring, with strategically positioned piezoelectric benders between the stator ring and the magnetic plates. A 3D-printed round plate serves as a connector between the magnetic plates and the piezoelectric benders to induce periodic compression. Symmetrically placed magnetic plates on the external surface of the rotator ring generate extractable charges. Both the inner and outer rings are 3D-printed, with disk supports on the inner surface of the stator ring facilitating piezoelectric attachment. The innovative design converts wind kinetic energy into rotational energy, driving the shaft and rotor ring of the harvester. This rotation creates periodic magnetic repelling forces that press the piezoelectric benders. By fixing the piezoelectric pieces across the ends of their disks and using connecting elements between the magnets and the piezoelectric materials, deformation occurs in the middle, aiding in flexion and higher voltage extraction. Experimental validation in a controlled wind tunnel environment demonstrates the successful harvesting of an average power of 524 microwatts. The optimized configuration utilizes piezoelectric benders with a diameter of 35 mm and a 7 mm distance between magnets, with Neodymium Magnets N42 employed as permanent materials. Importantly, this prototype demonstrated robustness and resilience, performing well at a wind speed of 6 m/s for over an hour without damage. Comprehensive experimental investigations will be conducted in both controlled laboratory settings and outdoor environments to validate the design of the rotor blades. In conclusion, this study highlights the importance of integrating innovative rotor blade designs with piezoelectric transducer technology to enhance the efficiency of small wind energy harvesting systems. The research addresses current gaps and shows promising experimental results, contributing to the advancement of sustainable energy solutions for various applications. By addressing the gap in current research and presenting promising experimental results, this work contributes to the advancement of sustainable energy solutions for various applications.

Presenting Author: SALEH ALHUMAID University of Hail

Presenting Author Biography: Dr. Saleh Alhumaid is a mechanical engineer and academic with a blend of industry experience and academic expertise. After graduating from the University of Hail's Mechanical Engineering Department in 2014, he embarked on a dynamic career path, commencing with a pivotal role at Aramco Company's Pipeline Department from 2014 to 2015.
Driven by a passion for advancing knowledge in mechanical engineering, he pursued advanced studies, earning both a Master's and Ph.D. degree in Mechanical Engineering from the University of South Florida in 2018 and 2022, respectively.
In 2022, he joined the faculty at the University of Hail as an Assistant Professor. Their dedication to teaching and research underscores a commitment to nurturing the next generation of engineering leaders while pushing the boundaries of knowledge in mechanical engineering

Authors:

SALEH ALHUMAID University of Hail