Wind turbine rotor blade having a spark gap
A wind turbine rotor blade is provided. The wind turbine blade has a lightning receptor, a first electric line, and a potential equalization arrangement having a first electrode, which is connected to the lightning receptor, and a second electrode, which is connected to the first electric line, a spark gap being formed between the two electrodes, mutually facing sides of the two electrodes forming an air flow channel, which is arranged such that the ambient air that is incident when the wind turbine rotor blade is in operation flows through it.
1. A wind turbine rotor blade comprising:
a potential equalization arrangement having a first electrode and a second electrode;
a lightning receptor connected to said first electrode;
an electric line connected to said second electrode;
a spark gap formed between said first and second electrodes;
said first and second electrodes having mutually facing sides;
said mutually facing sides forming an air flow channel; and,
said air flow channel being arranged so as to cause oncoming ambient air to flow through said flow channel as the wind turbine rotor blade is in operation.
2. The wind turbine rotor blade of claim 1 , further comprising:
an outer side exposed to said oncoming ambient air; and,
said air flow channel being arranged on said outer side.
3. The wind turbine rotor blade of claim 2 , wherein:
at least one of said first and second electrodes has an underside that bears against said outer side; and,
at least one of said first and second electrodes has one or more lateral faces disposed obliquely relative to said underside.
4. The wind turbine rotor blade of claim 2 , further comprising:
a lightning conductor connected to said lightning receptor;
a blade root; and,
said lightning conductor leading to said blade root.
5. The wind turbine rotor blade of claim 4 , further comprising:
a suction side;
an electric connecting piece disposed inside the wind turbine rotor blade and leading from said suction side to said first electrode;
said lightning conductor being disposed on said suction side; and,
said electric connecting piece connecting said lightning conductor with said first electrode.
6. The wind turbine rotor blade of claim 5 , further comprising:
a busbar arranged on said outer side;
said lightning conductor being arranged on said suction side; and,
said lightning conductor being connected to said first electrode via said busbar.
7. The wind turbine rotor blade of claim 6 , further comprising:
a profile trailing edge; and, said busbar being routed around said profile trailing edge.
8. The wind turbine rotor blade of claim 6 , wherein:
said busbar has an end arranged at a distance from said lightning conductor; and,
said end forms said first electrode.
9. The wind turbine rotor blade of claim 2 , further comprising:
a surface region defining an area on said outer side in which said first and second electrodes are arranged; and,
said surface region being provided with a heat-resistant coating.
10. The wind turbine rotor blade of claim 1 , further comprising:
a pressure side; and,
said air flow channel being arranged on said pressure side.
11. The wind turbine rotor blade of claim 1 , wherein:
said oncoming ambient air defines a flow direction;
said air flow channel defines a longitudinal direction; and,
said longitudinal direction is aligned with said flow direction of said oncoming ambient air.
12. The wind turbine rotor blade of claim 11 , wherein said air flow channel widens in said flow direction.
13. The wind turbine rotor blade of claim 1 , wherein at least one of said first and second electrodes has a shape of a disk.
14. The wind turbine rotor blade of claim 1 , further comprising:
an electric heating device; and,
said electric line being a supply line to supply said electric heating device with a heating current.