Patent ID: 8002521

Claim:
A flow machine, comprising: a first space that contains a first hot fluid and being delimited by a wall that has a first wall surface facing the first space and a second wall surface opposite the first space; and a cooling device for cooling a region of the wall by supplying a second fluid onto the second wall surface where the second fluid is relatively cooler than the first hot fluid, wherein the cooling device comprises: a supply chamber that contains the second fluid, a cavity arranged immediately adjacent the second wall surface, a duct having an inlet opening arranged at the supply chamber and an outlet opening arranged at the cavity and is adapted to convey the second fluid from the supply chamber to the cavity, where an extension plane extends through the outlet opening and intersects the second wall surface, and a deflection surface facing the cavity and adapted to re-direct the second fluid from the duct towards the second wall surface, wherein the deflection surface has a concave surface portion that is concave in the extension plane and adapted to re-direct the second fluid that leaves the duct such that it impinges substantially directly on the second wall surface to cool the wall, wherein the concave surface portion is curved along a curve in the extension plane, wherein the flow machine is constructed and arranged such that the first fluid flows through the machine in a main flow direction, wherein the duct has a centre line essentially parallel to the mainflow direction, wherein the centre line intersects the deflection surface at least in the proximity of the concave surface portion, wherein the deflection surface has an initial surface portion upstream the concave surface portion, wherein the initial surface portion slopes substantially straight towards the second wall surface with an angle α, where 10°≦α≦40°.