A1 Journal article (refereed), original research

Analysis of Radial Inflow Turbine Losses Operating with Supercritical Carbon Dioxide

Open Access publication

Publication Details

Authors: Uusitalo Antti, Grönman Aki

Publisher: MDPI

Publication year: 2021

Language: English

Related journal or series: Energies

Volume number: 14

Issue number: 12

ISSN: 1996-1073

JUFO level of this publication: 1

Digital Object Identifier (DOI): http://dx.doi.org/10.3390/en14123561

Open Access: Open Access publication


The losses of supercritical CO 2 radial turbines with design power
scales of about 1 MW were investigated by using computational fluid
dynamic simulations. The simulation results were compared with loss
predictions from enthalpy loss correlations. The aim of the study was to
investigate how the expansion losses are divided between the stator and
rotor as well as to compare the loss predictions obtained with the
different methods for turbine designs with varying specific speeds. It
was observed that a reasonably good agreement between the 1D loss
correlations and computational fluid dynamics results can be obtained by
using a suitable set of loss correlations. The use of different passage
loss models led to high deviations in the predicted rotor losses,
especially with turbine designs having the highest or lowest specific
speeds. The best agreement in respect to CFD results with the average
deviation of less than 10% was found when using the CETI passage loss
model. In addition, the other investigated passage loss models provided
relatively good agreement for some of the analyzed turbine designs, but
the deviations were higher when considering the full specific speed
range that was investigated. The stator loss analysis revealed that
despite some differences in the predicted losses between the methods, a
similar trend in the development of the losses was observed as the
turbine specific speed was changed.

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Last updated on 2021-14-09 at 11:01