A1 Journal article (refereed), original research

Design and loss analysis of radial turbines for supercritical CO2 Brayton cycles


Open Access hybrid publication

Publication Details
Authors: Uusitalo Antti, Turunen-Saaresti Teemu, Grönman Aki
Publisher: Elsevier
Publication year: 2021
Language: English
Related journal or series: Energy
Journal acronym: Energy
Volume number: 230
ISSN: 0360-5442
eISSN: 1873-6785
JUFO level of this publication: 3
Open Access: Open Access hybrid publication

Abstract

The use of supercritical fluids has been identified as potential solution in realizing highly efficient
and compact sized power systems. In this study, the effect of design
power scale and specific speed on supercritical CO2 operated radial inflow turbines within the power range of 0.1 MW–3.5 MW is investigated and analyzed. A radial turbine design tool including loss distribution analysis based on loss correlations was developed. In general, the SCO2
radial turbines can be designed to have high efficiency with efficiency
ranging from over 80%–87% depending on the turbine design power scale.
On the other hand, the turbine dimensions are small and the required rotational speeds are significantly high even at MW scale designs. It was observed that the specific speed and mass flow rate highly affect both the geometry and the turbine loss distribution. Turbine designs with highest isentropic efficiencies were observed with specific speeds ranging from 0.50 to 0.60. With the
lowest investigated turbine power outputs from 100 kW to few hundreds of
kW the tip clearance loss is the most significant loss whereas the
passage, stator and exit kinetic loss are the most significant loss sources at higher power levels.


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Last updated on 2021-31-05 at 14:52

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