PURPOSE: An active flow control multi-array horizontal axis tidal turbine is provided to maintain high generation efficiency regardless of flow direction by regulating the inflow angle of fluid to the rotor to the right angle. CONSTITUTION: An active flow control multi-array horizontal axis tidal turbine comprises at least one or more supporting parts(100), one or more generating parts(200), and rotary links(300). The supporting parts are installed on the seafloor. The generating parts are installed in the supporting parts and include an underwater closure(210), a rotor(220), and a generator assembly(230). The rotor is pivotally installed in the underwater closure and rotated with tide. The generator assembly generates by receiving the torque of the rotor. The rotary links connect the generating parts to the supporting parts. According to the flow direction of the tide, the generating parts are rotated to keep the inflow angle of the fluid to the rotor at the right angle.
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