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Turbines The design of wind turbines has been a focus of environmental engineers for many years, and there are many designs which can easily translate the energy of incoming wind into rotational energy though both vertical axis wind turbines (VAWT) and horizontal axis wind turbines (HAWT) [5]. Traditional turbines utilize a single rotor that spins perpendicular to incoming wind, and this rotation spins a generator, producing electricity. This is where it is necessary to consider the Betz limit, which states that up to 59% of wind power can ever be harnessed by a turbine [5]. To produce large amounts of power despite this limitation, these designs benefit from massive turbines moving at high speeds. Rotating DC-TENG technology could be fastened to the rotor of a traditional windmill, with one layer fixed to the axle, producing electricity through the triboelectric effect. However, this technology becomes more effective with increased speed, suggesting the use of smaller turbines. These would produce less torque than a massive HAWT, but can still operate quickly. In addition, placing a second rotor on the same axis and reversing the blade orientation will allow the adjacent rotors to spin in opposite directions. A DC TENG placed with one layer on each rotor would experience much greater relative rotational speed from the same incident wind due to this counter-rotation. If the rotors can be designed to be sufficiently light, a series of rotors of increasing size can be placed on a single axis. The resulting turbine has the potential to generate a substantial amount of electricity, depending primarily on the efficiency of the DC TENG and the efficiency of the blade airfoils. The state of California conducted a study of a counter-rotating wind turbine system, which utilizes two rotors spinning opposite directions on the same turbine tower. Each turbine spins a separate portion of the generator, leading to an increased efficiency of up to 40% at low Forti, 8PDF Image | Triboelectric Turbines: Multi-Rotor Counter-Rotating Wind Turbine Utilizing Direct-Current Triboelectric Nanogenerators
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