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1. (WO2017039568) TURBINE AIRFOIL COOLING CHANNEL WITH FENCED PEDESTALS

Pub. No.:    WO/2017/039568    International Application No.:    PCT/US2015/047323
Publication Date: Fri Mar 10 00:59:59 CET 2017 International Filing Date: Sat Aug 29 01:59:59 CEST 2015
IPC: F01D 5/18
Applicants: SIEMENS AKTIENGESELLSCHAFT
Inventors: LIANG, George
JIANG, Nan
MARSH, Jan H.
LEE, Ching-Pang
UM, Jae Y.
Title: TURBINE AIRFOIL COOLING CHANNEL WITH FENCED PEDESTALS
Abstract:
An air cooled turbine airfoil and method of cooling includes an outer wall (18) including pressure side wall and a suction side wall extend between a leading edge (12) and a trailing edge (14). A multiple pass serpentine flow cooling circuit extends along the turbine airfoil aft from the leading edge (12) region to the trailing edge (14) region. A plurality of pedestals (26) extends across at least one of the channels of the serpentine flow cooling circuit and is spread apart in a chordal direction to define radial passages for aft flowing cooling air (20). Discrete trip strips (30) are incorporated on the plurality of pedestals (26) forming a plurality of fenced pedestals (26). At least a portion of the quantity of plurality of pedestals (26) is tapered in length from a large diameter end (38) to a small diameter end (40). The small diameter end (40) of the plurality of pedestals (26) is adjacent to the outer wall (18) of the airfoil.