TURINE RING SEGMENT WITH ABRADABLE LAYER WITH COMPOUND ANGLE, ASYMMETRIC SURFACE AREA DENSITY RIDGE AND GROOVE PATTERN

摘要

Turbine casing abradable component having an abradable surface (1300) with a compound angle planform pattern of grooves and ridges (1302) defined by a pair of forward and aft linear segment portions (1302A, 1302B) that are conjoined by a transition portion (1302T). The forward ridges in the forward linear segment portion have greater surface area density than the aft ridges in the aft linear segment portion to compensate for greater ridge erosion in the forward zone during engine operation and reduce blade tip wear in the aft zone. Some abradable component embodiments increase forward zone ridge surface area density by incorporating wider ridges than those in the aft zone.