Vehicle component comprising a flow guiding element
A vehicle component includes a surface which, during operation, is exposed to an air flow. The surface includes a separating area where the air flow separates from the surface, and at least one obstructing element associated with the separating area for introducing an obstruction into the air flow. The obstructing element includes at least one guide surface which protrudes into the air flow. The guide surface is inclined relative to the local direction of the main air flow so that it confers on the part of the main air flow that impacts the guide surface a speed component that runs perpendicular to the local direction of the main air flow and induces turbulence in the air flow downstream of the obstructing element.
1. A vehicle component for a vehicle, in particular a rail vehicle for high-speed traffic, comprising:
a surface which, during operation, is exposed to a relative wind-induced air flow having a local main flow direction, wherein
said surface has a flow separation edge at which said air flow separates from said surface, and
at least one perturbing element located in the region of said flow separation edge is provided, which is formed in order to introduce a perturbation into said air flow,
wherein
said perturbing element has at least one guide face protruding into said air flow, wherein
said guide face being formed, and inclined by an inclination angle with respect to said local main flow direction, in such a way that a velocity component, which is oriented transversely with respect to said local main flow direction and which induces local turbulence in a shear layer of said air flow separating from said surface downstream of said perturbing element at said flow separation edge, is imposed to said part of said air flow striking said guide face.
2. The vehicle component according to claim 1 , wherein:
said surface defines a local surface normal,
said local surface normal defines a local normal plane with said local main flow direction, and
said guide face is inclined by said inclination angle with respect to said local normal plane.
3. The vehicle component according to claim 1 , wherein said inclination angle is 20° to 70°, preferably 30° to 60°, more preferably 40° to 50°, and in particular substantially 45°.
4. The vehicle component according to claim 1 , wherein:
said guide face has a length dimension which is 5 mm to 80 mm, preferably 15 mm to 65 mm, more preferably 30 mm to 50 mm, in particular substantially 40 mm, or
said guide face has a height dimension which is 2 mm to 10 mm, preferably 3 mm to 8 mm, more preferably 4 mm to 6 mm, in particular substantially 5 mm.
5. The vehicle component according to claim 1 , wherein:
said guide face is formed on a fin-like projection of said surface, and
said fin-like projection being formed in particular substantially prismatically.
6. The vehicle component according to claim 5 , wherein said fin-like projection has a thickness dimension which is 2 mm to 10 mm, preferably 3 mm to 8 mm, more preferably 4 mm to 6 mm, in particular substantially 5 mm.
7. The vehicle component according to claim 1 , wherein said guide face is formed as a side wall of an indentation of said surface.
8. The vehicle component according to claim 1 , wherein a plurality of perturbing elements are provided.
9. The vehicle component according to claim 8 , wherein said guide faces of two neighbouring perturbing elements are spaced apart transversely with respect to said local main flow direction by a transverse distance which is 20 mm to 100 mm, preferably 30 mm to 80 mm, more preferably 40 mm to 60 mm, in particular substantially 50 mm.
10. The vehicle component according to claim 8 ,
wherein:
said guide faces of two neighbouring perturbing elements are inclined in opposite senses with respect to said local main flow direction, and/or
said guide faces of two neighbouring perturbing elements are inclined in the same sense with respect to said local main flow direction.
11. The vehicle component according to claim 1 , wherein:
said surface has a transverse dimension transversely with respect to said local main flow direction, and
said perturbing elements are distributed along said transverse dimension of said surface, in particular uniformly at least in sections.
12. The vehicle component according to claim 1 , wherein said surface is formed in order to constitute at least one part of an outer skin of a wagon body of said vehicle.
13. The vehicle component according to claim 1 , wherein:
said surface is configured to be arranged on a lower side of wagon body, and
said surface being, in particular, configured to be arranged in the region of an end of a running gear cutout of said wagon body which is a leading end during operation.
14. The vehicle component according to claim 1 , wherein:
it is part of a pantograph of said vehicle,
said pantograph having a contact device comprising a contact element for making contact with a overhead line, and
said surface being arranged, in particular, on a lower side of said contact device, facing away from said contact face of said contact element.
15. A vehicle comprising a vehicle component according to claim 1 , which, in particular, is a vehicle for high-speed traffic with a nominal operating speed of more than 250 km/h, in particular more than 300 km/h.