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Int. J. Turbomach. Propuls. Power 2016, 1(1), 2; doi:10.3390/ijtpp1010002

Impact of the Exhaust Geometry on Flow Losses in a High-Pressure Steam Turbine

Siemens AG, Rheinstraße 100, 45472 Mülheim an der Ruhr, Germany
This paper is an extended version of our paper published in Proceedings of the European Turbomachinery Conference ETC’11, 2015, Paper No. 138.
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Author to whom correspondence should be addressed.
Academic Editor: Marcello Manna
Received: 14 September 2016 / Revised: 14 October 2016 / Accepted: 18 October 2016 / Published: 9 November 2016

Abstract

The design of modern steam turbines for power plant applications is steering towards higher efficiencies. A considerable contribution to this aim is expected from a reduction of flow losses in turbine intakes and exhausts. The present study therefore deals with the optimisation of the exhaust of a high-pressure (HP) turbine. In the first part of this study a numerical model is presented which allows for a precise representation of the exhaust flow. This computational fluid dynamics (CFD) model has been validated with a fair amount of experimental data from a test rig. For the second part of the study comprehensive numerical investigations have been carried out, considering the major geometrical parameters of such a geometry. In order to minimize the effort in design time and preprocessing a fully parametric 3D model of the geometry is created to prepare the different design variations. The results of these simulations allow to assess the performance differences of given exhaust designs in the early design phase without the need for expensive CFD simulations. Finally a potential for improvement of 300 kW for a 800 MW power plant is shown by means of a comparison of an optimised design to the baseline geometry. View Full-Text
Keywords: steam turbine; exhaust flow; volute design steam turbine; exhaust flow; volute design
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This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives License (CC BY-NC-ND) (CC BY-NC-ND).

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Musch, C.; Hecker, S.; Gloss, D.; Steinhoff, R. Impact of the Exhaust Geometry on Flow Losses in a High-Pressure Steam Turbine. Int. J. Turbomach. Propuls. Power 2016, 1, 2.

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