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1. (WO2017200549) TIP SHROUD WITH A FENCE FEATURE FOR DISCOURAGING PITCH-WISE OVER-TIP LEAKAGE FLOW

Pub. No.:    WO/2017/200549    International Application No.:    PCT/US2016/033471
Publication Date: Fri Nov 24 00:59:59 CET 2017 International Filing Date: Sat May 21 01:59:59 CEST 2016
IPC: F01D 5/20
F01D 5/22
F01D 11/08
Applicants: SIEMENS AKTIENGESELLSCHAFT
Inventors: WONG, Li Shing
THAM, Kok-Mun
LEE, Ching-Pang
Title: TIP SHROUD WITH A FENCE FEATURE FOR DISCOURAGING PITCH-WISE OVER-TIP LEAKAGE FLOW
Abstract:
A turbine blade tip shroud (22) includes a shroud base (20) extending in a circumferential direction of a turbine engine (64) and further extending in an axial direction of the turbine engine (64) from an upstream edge (56) to a downstream edge (58). A circumferential fin (50) extends radially outward from the shroud base (20) to run a tight gap with a stator component (51), to provide a sealing against a stream-wise over-tip leakage flow (FS) of gas path fluid in a direction generally from an airfoil leading edge (34) to an airfoil trailing edge (36). The shroud (22) includes a fence feature (70) extending generally radially outward with respect to an airfoil tip (24), and extending transverse to the circumferential fin (50), to discourage a pitch-wise over-tip leakage flow (FP) of gas path fluid in a direction from an airfoil pressure side (38) to an airfoil suction side (40).