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Table of Figures Figure 1: Operation of the semi-circle DC TENG. Image courtesy of Zhang et al [1]....................... 3 Figure 2: Summary of events which occur during a single cycle of a DC TENG, as shown in Figure 1. ................................................................................................................................................ 4 Figure 3: (a) The equivalent circuits during one full rotation of the semi-circle DC-TENG. (b) CAD model of various alternative designs. (c) Actual eighth-circle DC-TENG, including the carbon brushes. The outer diameter of the aluminum circle is 2.4 inches. Image courtesy of Zhang et al [1]........................................................................................................................................... 5 Figure 4: Reproduced data from Zhang et al. and extrapolated prediction (shown with dashed line) for the short circuit current density of a DC TENG at various rotational speeds [1]. ....... 6 Figure 5: Short circuit current from Zhang et al. DC TENG divided by the number of segments within each generator at various rotational speeds [1]. The linear best fit line is as Equation 1. ................................................................................................................................................ 7 Figure 6: Test model used to confirm the effects of triboelectricity. Acrylic is approximately 0.25 inches thick and 1 inch wide. .................................................................................................. 10 Figure 7: DC TENG test model 2.1. The s1 generator has a diameter of 2.5 inches, measured as the outer diameter of the PVC component............................................................................. 11 Figure 8: DC TENG test model 3.2, containing a single rotor with two electrically independent s20 generators. The rotor is driven through a belt drive system mounted on the test stand. ....................................................................................................................................... 12 Figure 9: Exploded view of DC TENG model 3.2, with key components labeled. Only key generic components and those designed specifically for the Narrow Electrode Fixed (NEF) half of the apparatus are labelled. Full component list shown in Appendix B. ........................................ 13 Figure 10: Version of model 3.2 in which the belt drive system has been removed and turbine blades added. Ultimately, this intended to be the basic design for models used in wind tunnel testing. ......................................................................................................................... 14 Figure 11: SolidWorks model of multiple-rotor DC TENG test stand model 3.3. Note the opposite orientation of turbine blades on each rotor. .......................................................................... 15 Figure 12: Turbine blades, manufactured through additive manufacturing (3D printing)............ 15 Figure 13: Open circuit voltage of a single DC-TENG at various rotational speeds, as indicated by the accompanying blocks on the right of the figure. Each data set contains a nearly uniform horizontal line which corresponds to a reading of zero volts, to elucidate analysis each was offset by a different amount. The proportionate difference between each peak and the baseline for that data set is preserved.................................................................................... 18 Figure 14: Side view of model 3.2, in which the rotating components have been highlighted in blue as part of the mass property calculation provided in Appendix E. The ink axis shown are located at the center of mass of the selection, with Ix oriented along the axis of rotation... 20 Figure 15: Isometric view of model 3.2, in which the Wide Electrode Fixed (WEF) side is in the foreground. Varying colors and transparencies are the result of SolidWorks materials properties fixed for each component. .................................................................................... 32 Figure 16: Section of isometric view of model 3.2. Some details of the interior components, such as the pipes and slip rings, are visible. .................................................................................... 33 Forti, iiiPDF Image | Triboelectric Turbines: Multi-Rotor Counter-Rotating Wind Turbine Utilizing Direct-Current Triboelectric Nanogenerators
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