Abstract: An arrangement including a turbine blade is provided. The turbine blade includes at least a root, an airfoil and a tip which is mounted to a rotor by means of the root. The rotor extends along a machine axis. The arrangement also includes a circumferential casing segment which includes a surface. The surface faces tips of the blades, wherein the surface is structured. A method to produce a casing segment is also provided. In order to increase efficiency without limiting the operational range of the turbine, the surface is provided at least partially with an at least partially ceramic coating. The method includes machining a first structure into the surface and providing the surface with a ceramic coating.

Abstract: A component defines a blade or a vane for a rotor rotatable about a rotary axis. An inner space of the component is limited by first and second walls, and forms a passage for a cooling fluid. First and second ribs project form the first and second walls, respectively, and form first and second channels for the fluid from a leading end to a trailing end of the ribs. The first and second ribs intersect and are directly connected to each other at said intersections. The first and second ribs intersect at an intersection joint in the proximity of the trailing end in such a way that the first channel and the second channel form a common outlet channel with a flow area.

Abstract: A component defines a blade or a vane for a rotor rotatable about a rotary axis. An inner space of the component is limited by first and second walls, and forms a passage for a cooling fluid. First and second ribs project form the first and second walls, respectively, and form first and second channels for the fluid from a leading end to a trailing end of the ribs. The first and second ribs intersect and are directly connected to each other at said intersections. The first and second ribs intersect at an intersection joint in the proximity of the trailing end in such a way that the first channel and the second channel form a common outlet channel with a flow area.

Abstract: The invention refers to a component defining a blade or a vane for a rotary machine having a rotor rotatable about an axis. The component includes an inner space forming a passage for a cooling fluid between first and second walls. First ribs project from the fist wall and extend essentially in parallel to each other to form fist channels for the fluid from a leading part of the inner space to a trailing part of the space. The first ribs extend in a first direction forming a first angle of inclination to the axis in the leading part and in a second direction forming a second angle of inclination to the axis in the trailing part. The first angle is greater than the second angle.