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TURBINE CANTILEVERED NOZZLE MOUNTING AND SEALING SYSTEM

IP.com Disclosure Number: IPCOM000249953D
Publication Date: 2017-May-08
Document File: 7 page(s) / 163K

Publishing Venue

The IP.com Prior Art Database

Abstract

A turbine cantilevered nozzle mounting and sealing system is configured to mount a turbine nozzle to an outer annular stationary engine casing.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 30% of the total text.

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TURBINE CANTILEVERED NOZZLE MOUNTING AND SEALING SYSTEM

ABSTRACT

[0001] A turbine cantilevered nozzle mounting and sealing system is configured to

mount a turbine nozzle to an outer annular stationary engine casing.

BACKGROUND

[0002] This disclosure relates generally to gas turbine engines and more particularly to

multi-stage gas turbine engines such as turboprop or turboshaft engines.

[0003] In a typical gas turbine engine, air is compressed in a compressor, mixed with

fuel, and ignited in a combustor, thereby generating hot gases. The gases flow

downstream through a high pressure turbine (HPT) having one or more stages including

one or more rows of HPT turbine nozzles and rows of HPT rotor blades. The gases then

flow to a low pressure turbine (LPT) or work turbine.

[0004] One of the biggest challenges, especially for small engines, is space constraint –

mostly in the radial direction, for example, very limited space is available between first

and second stage rotors to secure an HPT nozzle. Considering the fact that clearances do

not scale well with engine size, space available for structural features is very limited.

Further, with thermal load growing in modern engines, it is very difficult to design

reliable HPT nozzles as 360° rings; thus, the sealing of split lines and mounting features

becomes more difficult.

[0005] Another challenge is a weight constraint, especially important for two stage

turbines. As illustrated in FIG. 1, current methods use heavy bolted joints and require

several components. By eliminating heavy bolted joints and reducing the number of

components, the total weight of a multi-stage turbine may be brought down closer to a

single stage turbine.

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[0006] Certain two-stage turbines have a cantilevered second stage HPT nozzle mounted

from the outer band. It is desired to improve upon current sealing arrangements for these

cantilevered second stage HPT nozzles.

[0007] Described herein is a cantilevered nozzle mounting and sealing system for a

multi-stage turbine.

BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The invention may be best understood by reference to the following description

taken in conjunction with the accompanying drawing figures in which:

[0009] FIG. 1 is a schematic view of a conventional method of mounting a second stage

nozzle to an outer casing of a turbine engine; and

[0010] FIG. 2 is a schematic partial view of a multi-stage turbine using the mounting and

sealing system of the current disclosure.

DETAILED DESCRIPTION OF THE CONCEPT

[0011] Referring to the drawings wherein identical reference numerals denote the same

elements throughout the various views, FIG. 2 depicts schematically a partial view of a

multi-stage turbine 10. As shown, the turbine 10 includes a first stage nozzle 12, a first

stage rotor 14, a second stage nozzle 16, and a second stage rotor 18. Each of the first

stage nozzle 12, first stage rotor 14, second stage nozzle 16, and second stage rotor 18 are

surrounded by an outer a...