Research Papers: Gas Turbines: Controls, Diagnostics, and Instrumentation

Experimental Investigation on Fiber Thermocouples Used in Brush Seals for Temperature Measurements

[+] Author and Article Information
Shouqing Huang

State Key Laboratory of Tribology,
Tsinghua University,
Beijing 100084, China
e-mail: hshouqing@163.com

Shuangfu Suo

Associate Professor
State Key Laboratory of Tribology,
Tsinghua University,
Beijing 100084, China
e-mail: sfsuo@mail.tsinghua.edu.cn

Yongjian Li

State Key Laboratory of Tribology,
Tsinghua University,
Beijing 100084, China
e-mail: liyongjian@tsinghua.edu.cn

Jun Ding

China University of Mining and Technology,
Beijing 100083, China
e-mail: dingjun0823@163.com

Yuming Wang

State Key Laboratory of Tribology,
Tsinghua University,
Beijing 100084, China
e-mail: yumingwang@tsinghua.edu.cn

Contributed by the Controls, Diagnostics and Instrumentation Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received February 25, 2014; final manuscript received March 1, 2014; published online April 18, 2014. Editor: David Wisler.

J. Eng. Gas Turbines Power 136(9), 091602 (Apr 18, 2014) (6 pages) Paper No: GTP-14-1123; doi: 10.1115/1.4027069 History: Received February 25, 2014; Revised March 01, 2014

A type of fiber thermocouple is applied to a brush seal in order to obtain the temperature of the bristle-rotor friction zone. Using a brush seal test rig, the temperature measurements utilizing a fiber thermocouple, infrared thermometer, and common thermocouple are compared and studied. The fiber thermocouple is studied under various operational conditions consisting of different pressure and speed variations, rotor-bristle interferences, and eccentricities. Some interesting phenomena and characteristics of brush seals are revealed during these experiments. Some preliminary wear results of a fiber thermocouple are also presented. The results demonstrate the superiority of fiber thermocouples when used in narrow spaces, high temperature, and pressure environments within the heart of an aero-engine.

Copyright © 2014 by ASME
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Dogu, Y. and Aksit, M. F., 2005, “Brush Seal Temperature Distribution Analysis,” ASME J. Eng. Gas Turbines Power, 128(3), pp. 559–609. [CrossRef]
Bayley, F. J. and Long, C. A., 1993, “A Combined Experimental and Theoretical Study of Flow and Pressure Distributions in a Brush Seal,” ASME J. Eng. Gas Turbines Power, 115(2), pp. 404–410. [CrossRef]
Lelli, D., Chew, J. W., and Cooper, P., 2006, “Combined Three-Dimensional Fluid Dynamics and Mechanical Modeling of Brush Seals,” ASME J. Turbomach., 128(1), pp. 188–195. [CrossRef]
Pfefferle, D., Dullenkopf, K., and Bauer, H. J., 2011, “Design and Validation of a New Test Rig for Brush Seal Testing Under Engine Relevant Conditions,” ASME Paper No. GT2011-45107. [CrossRef]
Demiroglu, M. and Tichy, J. A., 2007, “An Investigation of Heat Generation Characteristics of Brush Seals,” ASME Paper No. GT2007-28043. [CrossRef]
Ruggiero, E. J., 2010, “Experimental Results From a Sensor Brush Seal,” AIAA Paper No. 2010-6830. [CrossRef]


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Fig. 1

Photograph of a fiber thermocouple

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Fig. 2

Micrograph of the fiber thermocouples and bristles

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Fig. 3

Installation of a fiber thermocouple in a brush seal

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Fig. 4

Photograph of the brush seal test rig

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Fig. 5

Cross-sectional view of the test cavity

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Fig. 6

Dimensions of the test brush seal

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Fig. 7

Photograph of the temperature test system: (a) general photograph, and (b) enlarged partial view of the test zone

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Fig. 8

Comparison of several temperature measurement methods

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Fig. 9

Thermal current routes in the fiber thermocouple

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Fig. 10

Measured results of a fiber thermocouple under various pressures

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Fig. 11

Measured results under various speeds

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Fig. 12

Steady temperatures comparison under conditions with and without pressure

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Fig. 13

Steady temperatures from a fiber thermocouple under various interferences

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Fig. 14

Temperature responses under the conditions of 0.02 mm interference and 0.25 mm eccentricity

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Fig. 15

Pictures of fiber thermocouples after 100 working hours: (a) inside the bristle pack, and (b) micrograph



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