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research-article

Condensation in radial turbines - Part A: Mathematical modelling

[+] Author and Article Information
Sebastian Schuster

University of Duisburg-Essen, Lotharstr. 1, 47057 Duisburg, Germany
s.schuster@uni-due.de

Dieter Brillert

University of Duisburg-Essen, Lotharstr. 1, 47057 Duisburg, Germany
dieter.brillert@uni-due.de

Friedrich-Karl Benra

University of Duisburg-Essen, Lotharstr. 1, 47057 Duisburg, Germany
friedrich.benra@uni-due.de

1Corresponding author.

ASME doi:10.1115/1.4040934 History: Received February 23, 2017; Revised July 17, 2018

Abstract

In this two-part paper, the investigation of condensation in the impeller of radial turbines is discussed. In part A, a solution strategy for the investigation of condensation in radial turbines using computational fluid dynamics (CFD) methods is presented. In part B, the investigation methodology is applied to a radial turbine type series that is used for waste heat recovery. Firstly, the basic CFD approach for the calculation of the gas-droplet-liquid-film flow is introduced. Thereafter, the equations connecting the subparts are explained and a validation of the models is performed. Finally, in part A, condensation phenomena for a selected radial turbine impeller are discussed on a qualitative basis. Part B continues with a detailed quantitative analyses. This study aims to develop a procedure that is applicable for investigation of condensation in radial turbines. Furthermore, the main processes occurring in a radial turbine once the steam temperature is below the saturation temperature are explained and analysed.

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