| 摘要 |
A pair of vertical axis wind turbines (1) are arranged in close proximity to each other so that their vortices interact with each other to provide enhanc ed aerodynamic efficiency. The wind turbines (1) are spaced as closely as possible while providing for machine and personnel safety. Adjacent wind turbines (1) rotate in opposite directions to enhance the coupled vortex effect. The vertical axis wind turbines (1) may be located underneath a row of horizontal axis turbines in a "bush-tree" configuration to provide greater energy extraction from a parcel of land. The vertical axis turbine (1) includes a simple, redundant, fail-safe braking system (14, 15) that self- resets after a fault condition clears. The braking system includes mechanica l (14, 15) and aerodynamic (23) braking and also includes a speed governor tha t stops the wind turbine even in the event that the primary brake fails.</SDOA B>
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