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AIRFOIL CHORD MEASUREMENT TOOL

IP.com Disclosure Number: IPCOM000247671D
Publication Date: 2016-Sep-26

Publishing Venue

The IP.com Prior Art Database

Abstract

A tool is configured to slide over or otherwise be mounted to a turbine engine airfoil. The tool includes openings used to accurately guide a measuring instrument in measuring a chord dimension of the airfoil.

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This is the abbreviated version, containing approximately 39% of the total text.

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AIRFOIL CHORD MEASUREMENT TOOL

ABSTRACT


[0001] A tool is configured to slide over or otherwise be mounted to a turbine engine airfoil. The tool includes openings used to accurately guide a measuring instrument in measuring a chord dimension of the airfoil.

BACKGROUND


[0002] This disclosure relates generally to gas turbine engines and more particularly to internal airfoils of such engines.


[0003] A gas turbine engine includes multiple rotor and stator stages, each stage including a plurality of airfoils (i.e. blades and vanes). In operation, engine airfoils experience loss of material resulting in a reduction of the airfoil's chordwise dimension ("chord loss") due to wear from environmental factors. Understanding the amount of chord loss is key to addressing efficiency concerns.


[0004] Existing methods for measuring chord loss can be time-consuming and cannot always be performed at a higher-level assembly or outside of a manufacturing environment.


[0005] Described herein is a tool for convenient measurement of airfoil chord.

BRIEF DESCRIPTION OF THE DRAWINGS


[0006] The concept may be best understood by reference to the following description taken in conjunction with the accompanying drawing figures, in which:


[0007] FIG. 1 is a schematic side elevation perspective view of a turbomachinery blade of a gas turbine engine;

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[0008] FIGS. 2-4 are schematic views of an airfoil chord measurement tool constructed according to the concept described herein, from side elevation, top plan, and bottom plan directions, respectively.


[0009] FIGS. 5-7 are schematic views of an alternative airfoil chord measurement tool constructed according to the concept described herein, from side elevation, top plan, and bottom plan directions, respectively;


[0010] FIGS. 8-9 are schematic views of an airfoil chord measurement tool constructed according to the concept described herein, from side elevation and top plan directions, respectively;


[0011] FIG. 10 is a schematic side elevation view of the airfoil chord measurement tool of FIGS. 2-4 with the airfoil of FIG. 1 inserted therein; and


[0012] FIG. 11 is a schematic top plan view of the airfoil chord measurement tool of FIGS. 2-4 with the airfoil of FIG. 1 inserted therein and a measuring instrument engaging the airfoil.

DETAILED DESCRIPTION OF THE CONCEPT


[0013] Illustrated in FIG. 1 is an exemplary turbomachinery blade 10 for a gas turbine engine. The turbomachinery blade 10 includes a dovetail 12, a shank 14, a platform 16, and an airfoil 18. The airfoil 18 extends in span from a root 20 to a tip 22 and includes opposed pressure and suction sides 24, 26 respectively extending between a leading edge 28 and a trailing edge 30. A parameter referred to as the airfoil's "chord" is defined as the length of a straight line connecting the furthest extents of the leading edge 28 and the trailing edge 30.


[0014] FIGS. 2-4 illustrate an exemplary chord measurement tool 32 which may be used with t...