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wind speeds. In addition to the resulting power increase, this moment-balancing design reduced the bending stress on the supporting tower compared to a single rotor system [6]. Such counter- rotating turbines cannot utilize more than two rotors, as there are only two elements of a traditional generator that rotate opposite one another. Other multi-rotor designs make use of a backup rotor to “catch” the air flow deflected from a front rotor, leading to increased overall efficiencies [7]. However, at this time, there have been no attempts to functionalize the rotational DC-TENG for energy harvesting using a turbine of any kind, let alone a turbine with multiple rotors. Materials and Methods Materials This senior design project is intended to result in the production of a direct-current triboelectric nanogenerator which can be used by an ongoing Green Fee project to produce electric power from low speed winds on campus at Union College [8]. The majority of the structural components were laser cut from 0.25-inch thick acrylic sheets purchased from McMaster Carr. Electronic slip rings and motors were purchased from Pololu. PVC, polycarbonate, and aluminum sheet were purchased from McMaster-Carr, and machined using a water jet in the Union College machine shop. Short sections of pipe and bushings were precision machined by technicians in this shop as well. Acetyl butyl styrene (ABS) filament was purchased from MatterHackers and used to 3D print model turbine blades. Design and Manufacture of DC TENG Models Sanity Check: Model 1 The first product was model 1.1, a simple arrangement in which a scrap of acrylic was covered with a sheet of aluminum foil, which was then taped in place, as shown in Figure 6. The Forti, 9PDF Image | Triboelectric Turbines: Multi-Rotor Counter-Rotating Wind Turbine Utilizing Direct-Current Triboelectric Nanogenerators
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