Patent ID: 7201564

Claim:
A turbine guide vane, comprising: a foot region, arranged radially on the outside; a head region arranged radially on the inside; and a cooling-air duct, running between the head region and the foot region, including, an inlet orifice in the foot region adapted to receive cooling air, an outlet orifice in the head region adapted to at least partially discharge air, a radial inner duct, through which the cooling air is adapted to flow from the foot region to the head region, and an outer duct, contiguous to the inner duct and at least partially surrounding the inner duct circumferentially, adapted to communicate with the inner duct and including an outlet orifice in the foot region, wherein a cooling-air fraction is adapted to flow through the outer duct back in the direction of the foot region and is adapted to flow out through the outlet orifice.