Wind turbine generating apparatus

A wind turbine apparatus, comprising:

• a tower,
• a nacelle supported on the tower, said nacelle comprising an outer wall and a closed inner space,
• a generator installed inside the closed inner space,
• a rotor head and a wind turbine blade attached to the rotor head, wherein
• the rotor head is configured to rotate, upon receiving outside wind on the wind turbine blade, and to drive the generator to generate electricity,
• the rotor head comprises a rotor hub configured to support the wind turbine blade rotatably in a pitch direction, and a hub cover configured to cover the rotor hub, an interior space formed between the rotor hub and hub cover, and
• the wind turbine blade comprises a communication port configured to communicate between the interior space formed between the rotor hub and the hub cover and an interior space of the wind turbine blade, and the wind turbine blade further comprises an air outlet which communicates between the interior space of the wind turbine blade and an outside environment,
• a rotor head cooling air passage configured to communicate between the interior space formed between the rotor hub and the hub cover, the communication port and the air outlet,
• a cooling air introduction portion configured to allow outside air to flow into the rotor head cooling air passage, and
• a nacelle interior air passage defined between the outer wall of the nacelle and the closed inner space and configured to communicate with the rotor head cooling air passage, wherein the nacelle interior air passage is configured to cool outside of the closed inner space and discharge cooling air through the rotor head cooling air passage to the outside environment.