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Research Papers

Test Rig for Applied Experimental Investigations of the Thermal Contact Resistance at the Blade-Rotor-Connection in a Steam Turbine

[+] Author and Article Information
Dennis Toebben

Institute of Power Plant Technology,
Steam and Gas Turbines,
RWTH Aachen University,
Templergraben 55,
Aachen 52064, Germany
e-mail: toebben@ikdg.rwth-aachen.de

Xavier E. R. de Graaf, Piotr Luczynski, Manfred Wirsum

Institute of Power Plant Technology,
Steam and Gas Turbines,
RWTH Aachen University,
Templergraben 55,
Aachen 52064, Germany

Wolfgang F. D. Mohr

General Electric (Switzerland) GmbH Brown,
Boveri Street 7,
Baden 5401, Switzerland

Klaus Helbig

General Electric Power AG,
Boveristr. 22,
Mannheim 68309, Germany

1Corresponding author.

Manuscript received February 13, 2018; final manuscript received October 7, 2018; published online January 21, 2019. Assoc. Editor: Coutier-Delgosha Olivier.

J. Turbomach 141(2), 021007 (Jan 21, 2019) (8 pages) Paper No: TURBO-18-1025; doi: 10.1115/1.4041748 History: Received February 13, 2018; Revised October 07, 2018

Recent studies have shown that in a prewarming, respectively, warm-keeping operation of a steam turbine, the blades and vanes transport most of the heat to the thick-walled casing and rotor. Thereby, a thermal bottle-neck arises at the connection between the blade root and the rotor. The thermal contact resistance (TCR) at these interfaces affects the temperature distribution and thus the thermal stresses in the rotor. The present paper introduces an experimental setup, which is designed to quantify the TCR at the blade-rotor-connection of a steam turbine. An uncertainty analysis is presented, which proves that the average measurement uncertainties are less than one percent. The experiments especially focus on the investigation of the contact pressure, which is a function of the rotational speed. Therefore, the results of several steady-state measurements under atmospheric and evacuated atmosphere using a high temperature-resistant chromium-molybdenum steel are presented. For the evaluation of the TCR, a numerical model of the specimen is developed in addition to a simplified 1D approach. The results show a significantly increasing TCR with decreasing contact pressure, respectively, rotational speed.

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References

Toebben, D. , Luczynski, P. , Diefenthal, M. , Wirsum, M. , Reitschmidt, S. , Mohr, W. , and Helbig, K. , 2017, “ Numerical Investigation of Heat Transfer and Flow Phenomena in an IP Steam Turbine in Warm-Keeping Operation With Hot Air,” ASME Paper No. GT2017-63555.
Pusch, D. , Voigt, M. , Vogeler, K. , Dumstorff, P. , and Almstedt, H. , 2016, “ Setup, Validation and Probabilistic Robustness Estimation of a Model for Prediction of LCF in Steam Turbine Rotors,” ASME Paper No. GT2016-57321.
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Figures

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Fig. 1

Computer-aided design model

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Fig. 3

Installed specimens

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Fig. 4

Measurement positions

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Fig. 5

Conjugate heat transfer simulation with hexahedral mesh (left), hexahedral mesh (center), CI and AP (right)

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Fig. 6

Total heat transfer from blade to rotor regarding different heat transfer phenomena through the air pockets (CHT model THC=500 °C, TCool=30 °C)

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Fig. 7

Heat transfer through the air pockets related to the contact heat transfer (CHT model THC=500 °C, TCool=30 °C)

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Fig. 8

Temperature fluctuation over time between the measurement positions T4 and T5

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Fig. 9

Average dimensionless temperature differences ϑ at contact interface CI2

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Fig. 11

Temperature distribution, calculated with FEM model (pc = 4.8 MPa, vac, TH=150 °C)

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Fig. 10

Incoming and outgoing heat fluxes for different measurement series

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Fig. 12

Comparison of TCR calculated by 1D and FEM model (vac, TH=150 °C)

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Fig. 13

Comparison of heat fluxes calculated by 1D and FEM model (vac, TH=150 °C)

Tables

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