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Int. J. Turbomach. Propuls. Power 2018, 3(2), 17; https://doi.org/10.3390/ijtpp3020017

Methods for Controlling Gas Turbine Casing Flows During Engine Shutdown

1
Osney Thermo-Fluids Laboratory, University of Oxford, Oxford OX2 0ES, UK
2
Research & Innovation Center, Mitsubishi Heavy Industries, Ltd., 2-1-1 Shinhama, Arai-Cho, Takasago 676-8686, Japan
*
Author to whom correspondence should be addressed.
Received: 19 February 2018 / Revised: 31 May 2018 / Accepted: 6 June 2018 / Published: 12 June 2018
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Abstract

During the shutdown of a gas turbine, natural convection flows occur inside of the engine casing. These natural convection flows cause the top of the engine casing to cool more slowly than the bottom of the casing. This non-uniform cooling can cause the casing to distort, known as “cat-back” distortion. This distortion leads to reduced tip and seal clearances, which can cause rubbing and binding. In this study, two different methods for reducing the non-uniform casing heat transfer in an industrial gas turbine during shutdown were investigated. A baseline case with no active method for reducing the casing heat transfer was compared with purge and flow extraction methods. It was found that the new proposed extraction method improved the uniformity of the casing heat transfer during the initial shutdown period. View Full-Text
Keywords: natural convection; gas turbine; shutdown; casing distortion natural convection; gas turbine; shutdown; casing distortion
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Pilkington, A.; Rosic, B.; Horie, S. Methods for Controlling Gas Turbine Casing Flows During Engine Shutdown. Int. J. Turbomach. Propuls. Power 2018, 3, 17.

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