Research Papers: Gas Turbines: Turbomachinery

Effects of Centrifugal Forces on Particle Deposition for a Representative Seal Pin Between Two Blades

[+] Author and Article Information
M. D. Barringer

e-mail: mbarringer@psu.edu

K. A. Thole

e-mail: kthole@psu.edu

D. L. Breneman

e-mail: dbreneman@usboiler.net
Mechanical and Nuclear Engineering Department,
Pennsylvania State University,
University Park, PA 16802

K.-M. Tham

e-mail: kokmun.tham@siemens.com

V. Laurello

e-mail: vincent.laurello@siemens.com
Siemens Energy,
Orlando, FL 32826

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the Journal of Engineering for Gas Turbines and Power. Manuscript received June 19, 2012; final manuscript received September 1, 2012; published online February 11, 2013. Editor: Dilip R. Ballal.

J. Eng. Gas Turbines Power 135(3), 032601 (Feb 11, 2013) (10 pages) Paper No: GTP-12-1184; doi: 10.1115/1.4007751 History: Received June 19, 2012; Revised September 01, 2012

Many land-based gas turbine applications are conducive to the formation of rust in the supply piping and other components that are upstream of the gas turbine. Many of these applications do not incorporate an effective filtration system for removing rust particles from the secondary air systems thereby resulting in rust deposits. Deposits in the small passages significantly block the secondary flow that ultimately reduces component life. This study investigates the effects of rust deposition in a geometry representative of an axial seal pin between two blades. Initial studies were performed to determine the effects of engine-representative particle composition, temperature, and centrifugal acceleration on deposition characteristics. These initial results pointed to the importance of simulating centrifugal forces representative of that experienced in the engine. A new facility was developed to directly measure flow blockages under static conditions and under rotational conditions.

Copyright © 2013 by ASME
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Fig. 1

(a) Illustration of the leakage flow through the blade platform between two blades, (b) schematic illustrating the seal pin region, and (c) schematic showing the cross section of the seal-pin and blade platforms

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Fig. 2

Size distributions for rust particles from turbine deposition samples and the laboratory test particles

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Fig. 3

Rust particles at room temperature and during heating. Sample compositions: (1) 100% red Fe2O3; (2) 100% black Fe2O3; (3) 90% red Fe2O3, 10% Al2O3; (4) 45% red Fe2O3, 45% black Fe2O3, 10% Al2O3.

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Fig. 4

Rust particles before and after centrifuging

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Fig. 5

Schematic of the static test facility

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Fig. 6

Schematic of the rotating test facility

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Fig. 7

Illustration of (a) rotating test chamber designed to spin three identical test pieces representative of the engine seal pin and platform gap region shown in (b)

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Fig. 8

Particle diffuser plate used during the rotating tests (a) schematic and (b) photographs

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Fig. 9

Baseline flow function for seal pin gap before (original) and after (retest) rust injection tests

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Fig. 10

Flow function as a function of time before and after particle injection

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Fig. 11

Reduction in flow due to rust injection for the static testing

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Fig. 12

Blade locations for ESEM particle analysis

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Fig. 13

ESEM images of rust at 500× magnification; sample numbers correspond with Fig. 12. Across top row (left to right) is shown preinjection; locations 4 and 2. Across the bottom row is locations 3, 5, and 1.

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Fig. 14

Baseline flow function as a function of pressure ratio for the rotating tests with a single test part open to the flow at Ω = 0.002

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Fig. 15

Baseline flow function as a function of pressure ratio for the rotating tests, with all the three test parts open to the flow at both Ω = 0.002 and 1.0 (curves are best fits to data)

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Fig. 16

Rust deposition for 1500 and 10,300 rpm (view of test geometry in outward radial direction)

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Fig. 17

Flow blockage results for the rotating tests when Ω = 0.002 at various pressure ratios

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Fig. 18

Flow blockage results for the rotating tests at both Ω = 0.002 and Ω = 1 for PRrot = 1.6




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