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research-article

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, 52064 Aachen, Germany
toebben@ikdg.rwth-aachen.de

Xavier E. R. de Graaf

Institute of Power Plant Technology, Steam and Gas Turbines, RWTH Aachen University, Templergraben 55, 52064 Aachen, Germany
xavier.de.graaf@rwth-aachen.de

Piotr Luczynski

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

Manfred Wirsum

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

Wolfgang F. D. Mohr

Institute of Power Plant Technology, Steam and Gas Turbines, RWTH Aachen University, Templergraben 55, 52064 Aachen, Germany
wolfgang.mohr@ge.com

Klaus Helbig

Institute of Power Plant Technology, Steam and Gas Turbines, RWTH Aachen University, Templergraben 55, 52064 Aachen, Germany
klaus.helbig@ge.com

1Corresponding author.

ASME doi:10.1115/1.4041748 History: Received February 13, 2018; Revised October 07, 2018

Abstract

Recent studies have shown that in a pre-warming 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.

Copyright (c) 2018 by ASME
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