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• W4387409411 endingPage "108785" @default.
• W4387409411 startingPage "108785" @default.
• W4387409411 abstract "The performance of the piezoelectric energy harvester (PEH) driven by a single bluff body is not entirely satisfactory in wind environment. However, the wake excitation generated by the interference cylinder can intensify the vibration and subsequently increase the harvested energy. This paper presents a piezoelectric energy harvester which uses an elliptical cylinder for interference (ECI). The extended Hamilton’s principle and the Gauss’s law is applied to obtain the electro-mechanical coupling model. Following this, the analytical solution is derived by employing the Galerkin procedure. Experiments pertaining to this study were conducted in a DC wind tunnel, where ECIs of varying aspect ratios were positioned directly upstream of the PEH. The experimental results not only verify the model accuracy, but also identify the distance between the ECI and the bluff body in terms of the proximity interference region, induced galloping region, and wake interference region. Only when the system is located in the induced galloping region, does the harvester’s output power significantly increase and the system stability improve. Furthermore, as the aspect ratio of the elliptical cylinder decreases, the harvested energy increases, and when the wind speed reaches 18 m/s, with the aspect ratio and the spacing ratio being 0.4 and 13 respectively, the harvester can yield a power density of 10.93 kW/m3. This is 624% higher than that without wake excitation. Numerical simulations demonstrate that the wake, generated by ECI, interferes with the positive pressure region in front of the funnel-shaped bluff body. This interference shifts the location of the positive pressure region to the sides of the bluff body and reduces its area." @default.
• W4387409411 created "2023-10-07" @default.
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• W4387409411 date "2023-10-01" @default.
• W4387409411 modified "2023-10-08" @default.
• W4387409411 title "Enhancement of piezoelectric energy harvesting by the elliptical cylinder interference" @default.
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• W4387409411 doi "https://doi.org/10.1016/j.ijmecsci.2023.108785" @default.
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