GAS TURBINE BLADE TIP SHROUD FLOW GUIDING FEATURES

摘要

A turbine blade (10) includes an airfoil (12) extending span-wise along a radial direction, and a shroud (26) positioned along a tip (22) of the airfoil (12) extending generally along a circumferential direction, scalloped, across a pressure side (18) and a suction side (20) of the airfoil (12), the shroud (26) includes an upstream edge (28) and a downstream edge (30) spaced apart axially. The shroud (26) further includes a radially inner surface (32) adjoining the tip (22) of the airfoil (12) and a radially outer surface (34) opposite to the radially inner surface (32). A shroud ridge (42) extends across the shroud (26) along a portion of the radially outer surface (34). A plurality of bladelets (44) is attached across a span of the shroud ridge (42) in a row. The plurality of bladelets (44) produces a plurality of passages (46) with each passage (46) in between each bladelet (44). Half-width passages (50) lie along each of an extreme edge of the plurality of bladelets (44). An intershroud bridge (48) that extends along a portion of the shroud ridge (46) closes at least one half-width passage (50) along at least one end of the shroud ridge (46) at an extreme end (52) of the plurality of bladelets (44). The shroud also include a seal (38) extends radially outward from the radially outer surface (34) of the shroud (26).