Research Papers: Gas Turbines: Structures and Dynamics

Dynamic Response of a Metal and a CMC Turbine Blade During a Controlled Rub Event Using a Segmented Shroud

[+] Author and Article Information
Nisrene Langenbrunner, Matt Weaver

GE Aviation,
Cincinnati, OH 45215

Michael G. Dunn

Gas Turbine Laboratory,
Ohio State University,
Columbus, OH 43235
e-mail: dunn.129@osu.edu

Corso Padova, Jeffery Barton

Gas Turbine Laboratory,
Ohio State University,
Columbus, OH 43235

Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 30, 2014; final manuscript received September 2, 2014; published online December 9, 2014. Editor: David Wisler.

J. Eng. Gas Turbines Power 137(6), 062504 (Jun 01, 2015) (8 pages) Paper No: GTP-14-1449; doi: 10.1115/1.4028685 History: Received July 30, 2014; Revised September 02, 2014; Online December 09, 2014

Ceramic matrix composites (CMCs) provide several benefits over metal blades including weight and increased temperature capability, and have the potential for increased engine performance by reduction of the cooling flow bled from the compressor and by allowing engines to run at higher turbine inlet temperatures. These CMC blades must be capable of surviving fatigue (high cycle and low cycle), creep, impact, and any tip rub events due to the engine missions or maneuvers that temporarily close blade tip/shroud clearances. As part of a cooperative research program between GE Aviation and the Ohio State University Gas Turbine Laboratory, OSU GTL, the response of a CMC stage 1 low-pressure turbine blade has been compared with the response of an equivalent metal turbine blade using the OSU GTL large spin-pit facility (LSPF) as the test vehicle. Load cells mounted on the casing wall, strain gages mounted on the airfoils, and other instrumentation are used to assess blade tip rub interactions with a 120-deg sector of a representative turbine stationary casing. The intent of this paper is to present the dynamic response of both the CMC and the metal blades with the turbine disk operating at design speed and with representative incursion rates and depths. Casing wear and blade tip wear are both characterized for several types of rub conditions including a light, medium, and heavy rub at room temperature. For each condition, the rub primary dynamic modes have been evaluated, and the corresponding blade tip loads have been calculated. The preliminary results suggest that a CMC blade has similar abilities to a metal blade during a rub event.

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Fig. 4

Load cell measurement axis (metal blade shown)

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Fig. 5

Segmented shoe wear scar for blade light rub condition

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Fig. 3

Typical x-direction load cell response with the BCS

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Fig. 2

Typical incursion motion with BCS

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Fig. 1

Tip rub rig schematic

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Fig. 6

Precision micrometer within the LSPF

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Fig. 7

Blade tip wear comparisons of metal and CMC

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Fig. 8

Filtering system noise

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Fig. 9

Torque zones for force estimation

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Fig. 10

Comparing max load cell factors for both blades in the radial and tangential directions

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Fig. 11

Light rub strain gage frequency decomposition

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Fig. 12

Medium rub 1F content for both blades



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