A structured surface used as grazing layer in turbomachines

摘要

The abradable (1) forms a pattern built up of strip-like elements (5) which lie in directions of ribs (15) on connection lines between corner points of a reference grid. The rib direction differs from direction of movement (v) of blade tips (2) at about 80 to 95 percent of an abraded surface (10). The movement direction of two thirds of abraded surface deviates from rib direction at about 30 to 45 percent. The abraded surface is formed by material ablation by moving machine blade tips over the profiled abradable in a predetermined direction. The profiling of the surface is formed by ribs which surround chamber like depressions (11). The strip-like elements of the abraded surface can be curved as well as discrete or partly connected strips. An Independent claim is also included for a flow machine e.g. gas turbine.