For nuclear power system, the supercritical CO2-based Brayton cycle is very promising for its potentially higher efficiency and compactness compared to steam-based Rankine cycle. Compressor is the critical component in the supercritical CO2-based cycle, which typically operates at an inlet fluid state close to the fluid critical point for optimal cycle efficiency. As the fluid parameters vary significantly near the critical point, the compressor is more vulnerable to flow instabilities and care must be taken in designing the compressor. The supercritical CO2 radial compressor features a compact design and the unsteady interactions between the impeller and the vaned diffuser are typically strong. A comprehensive understanding of the unsteady flow effects in the compressor is very helpful in guiding the aerodynamic design. However, little work has been performed on the flow analysis of the unsteady impeller-diffuser interactions in the supercritical CO2 radial compressor. In this work, the unsteady flow simulation of a supercritical CO2 radial compressor stage is carried out. Strong flow unsteadiness is observed and the isentropic efficiency shows a variation of over 20% within one revolution.
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2018 26th International Conference on Nuclear Engineering
July 22–26, 2018
London, England
Conference Sponsors:
- Nuclear Engineering Division
ISBN:
978-0-7918-5149-4
PROCEEDINGS PAPER
Analysis of Unsteady Flow in a Supercritical Carbon Dioxide Radial Compressor Stage
Can Ma,
Can Ma
Wuhan Second Ship Design and Research Institute, Wuhan, China
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Wei Wang,
Wei Wang
Wuhan Second Ship Design and Research Institute, Wuhan, China
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Jun Wu,
Jun Wu
Wuhan Second Ship Design and Research Institute, Wuhan, China
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Lu Dai
Lu Dai
Wuhan Second Ship Design and Research Institute, Wuhan, China
Search for other works by this author on:
Can Ma
Wuhan Second Ship Design and Research Institute, Wuhan, China
Wei Wang
Wuhan Second Ship Design and Research Institute, Wuhan, China
Jun Wu
Wuhan Second Ship Design and Research Institute, Wuhan, China
Lu Dai
Wuhan Second Ship Design and Research Institute, Wuhan, China
Paper No:
ICONE26-82183, V06BT08A037; 8 pages
Published Online:
October 24, 2018
Citation
Ma, C, Wang, W, Wu, J, & Dai, L. "Analysis of Unsteady Flow in a Supercritical Carbon Dioxide Radial Compressor Stage." Proceedings of the 2018 26th International Conference on Nuclear Engineering. Volume 6B: Thermal-Hydraulics and Safety Analyses. London, England. July 22–26, 2018. V06BT08A037. ASME. https://doi.org/10.1115/ICONE26-82183
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