Asea Brown Boveri Ag

Alstom

Abb Alstom Power (schweiz) Ag

Konrad Vogeler

Bernhard Weigand

Alexander Beeck

Hans Wettstein

Beat Von Arx

Wilhelm Endres

Sriwickrama Prithiviraj Harasgama

Kenneth Hall

A process for producing a casting core which is used for forming within a casting a cavity intended for cooling purposes, through which a cooling medium can be conducted, the casting core having surface regions in which there is incorporated in a specifically selective manner a surface roughness which transfers itself during the casting operation to surface regions enclosing the cavity and leads to an increase in the heat transfer between the cooling medium and the casting.

Process for producing a casting core, for forming within a cavity intended for cooling purposes

A cooling passage of a component subjected to high thermal loading, which is formed as a cavity ( ), running in a longitudinal direction (L) and curved orthogonally to the longitudinal direction (L), between a first wall ( ) and a second wall ( ), which in each case are connected to one another in a laterally adjacent manner, which has ribs ( ), which are arranged on the first wall ( ) and the second wall ( ) such that they alternate in a longitudinal direction (L) and are staggered relative one another and, at least in sections, assume a non-orthogonal angle relative to a projected center axis ( &prime;), and through which a cooling fluid (K) can flow in a longitudinal direction (L), in which case, when the profile of the cavity ( ) is curved orthogonally to the longitudinal direction (L), the ribs ( ) are formed in such a way that, in each case locally with regard to the adjacent rib of the opposite wall, they maintain a distance (a) which is half a respective local rib spacing (p). It is thereby possible to even out the heat transfer at a curved passage profile.

Cooling passage of a component subjected to high thermal loading

The arrangements according to the invention and the method according to the invention serve to cool platforms in turbomachines. To this end, in two platforms,&prime; arranged directly next to one another and having a separating gap,running between the platforms, at least one cooling passage,is arranged along the separating gap,. In this case, the cooling passage,runs approximately parallel to the surface of the platforms,&prime;. The cooling passage,is preferably designed as a slit-like recess in at least one side wall adjacent to the separating gap,. If blades,&prime; are arranged on the platforms,&prime;, the cooling passage,expediently runs approximately centrally between the blades. In addition, the cooling passage,preferably has a course similar to the course of the blade profile.

Platform cooling in turbomachines

Non-contact sealing of gaps in gas turbines

Growing community of inventors

Küssaberg, Germany

Konrad Vogeler