Efficiency investigation on energy harvesting from airflows in HVAC system based on galloping of isosceles triangle sectioned bluff bodies
By Junlei Wang, Lihua Tang, Liya Zhao, Zhien Zhang. Energy, 2019
225 citations recorded by the source corpus.
Abstract Galloping-based piezoelectric energy harvester (GPEH) has been used in power generation from small-scale airflows for low-power devices such as Micro-Electromechanical Systems (MEMS) and wireless sensing electronics. The bluff body plays an important role for the onset of galloping. Existing literature regarding analytical and numerical analysis of GPEH has focused on designs incorporating bluff bodies with a variety of cross-sections, such as square, D-section and regular triangle. In this work, a GPEH with triangular cross-section bluff bodies with different vertex angles is investigated. The aerodynamic characteristics are determined by Computational Fluid Dynamics (CFD) and verified by experimental data. Subsequently, an aero-electro-mechanical model with piezoelectric coupling is established and numerically solved. Furthermore, a parametric study is performed to investigate the influence of electromechanical coupling on the GPEH's behavior, with a focus on the threshold wind speed, transverse displacement and power output. It is determined that with weak coupling, the obtuse angle β = 130° is the most preferred vertex angle. This is the first documented determination that an obtuse angled isosceles triangle could be used for efficient galloping energy harvesting. The findings provide a guideline for designing efficient GPEHs with triangular bluff bodies.
Subfields: Civil and Structural Engineering, Control and Systems Engineering, Mechanical Engineering
View Paper: https://www.semanticscholar.org/paper/3523636ccbeb4a8fafc4ae55d18b8ce59e524bea
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Citations in the corpus
- Hybrid wind energy scavenging by coupling vortex-induced vibrations and galloping (2020, background): “However, the VIVPES performs well only in the lock-in 67 region [41-44], because only when the vortex shedding frequency locks on the resonant 68 frequency of the system, the vibration becomes significantly intense.”
- The state-of-the-art review on energy harvesting from flow-induced vibrations (2020, background): “[108-110] proposed that the energy in the airflow of heating, ventilation 574 and air conditioning (HVAC) can be collected through the principle of flow-induced 575 vibrations, so as to optimize building energy consumption and realize the purpose of 576 building energy conservation.”