A4 Conference proceedings

Loss Generation in Radial Outflow Steam Turbine Cascades


Open Access publication

Publication Details
Authors: Grönman Aki, Uusitalo Antti, Backman Jari
Publication year: 2017
Language: English
Related Journal or Series Information: Proceedings of the European Turbomachinery Conference
Title of parent publication: Proceedings of 12th European Conference on Turbomachinery Fluid Dynamics & Thermodynamics, ETC12
Journal acronym: ETC
ISSN: 2313-0067
eISSN: 2410-4833
JUFO-Level of this publication: 1
Open Access: Open Access publication

Abstract

Small high-speed technology based radial outflow steam turbines are characterised by ultra-low aspect ratios, which can lead to rapidly growing secondary losses. The preliminary evaluation of turbine performance is usually based on axial turbine loss predictions, which can be a source of error. The main objectives of this work are to find out how the losses are generated in radial outflow turbines when the aspect ratio is markedly below
unity and how accurately axial turbine loss models can predict the trends. To achieve these objectives, a radial outflow turbine cascade having a blade shape and aspect ratios comparable with a prototype machine is examined. As a result of the study, it is suggested that for the examined radial outflow cascade the axial turbine loss correlations can predict the trends reasonably well. The rapidly increasing secondary losses are connected to the merging of secondary structures and also incidence at off-design.


Projects
HERGE (01/01/2014 - 31/12/2015)

Last updated on 2018-19-10 at 07:55