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3.5 Summary A design study has been performed for radial versions of the main and recompression compressors. It is found that for the main compressor, a single stage design can provide adequate efficiency with reasonable size. For the recompression compressor, a single stage design gives unacceptably low efficiency with very large diameter. This will result in low system performance and difficulties in mechanical design. It is found that a two-stage design can significantly increase the efficiency of the recompression compressor, and at the same time, significantly reduce the diameters. A three-stage design can further improve efficiency and reduce diameter. The study also indicates that further increasing the number of stages does not lead to a significant gain in both efficiency and size. It is concluded that a single stage main compressor and three-stage recompression compressor represent good design choices. As noted elsewhere in this report (see Chapter 6), a hybrid design, which mixes axial and radial stages, may capture the benefits of both options. Therefore we suggest that a further study should be carried out for a hybrid design. 3.6 References for Chapter 3 3.1 Rodgers, C., “Efficiency of Centrifugal Compressor Impellers”, Paper 22 of AGARD Conference Proceedings No 282, 1980. 3.2 Aungier, R. H., Centrifugal Compressors, A Strategy for Aerodynamic Design and Analysis, ASME Press, 2000. 3.3 Balje, O.E., Turbomachines: A Guide to Design, Selection, and Theory, John Wiley & Sons, Inc., 1981. 3.4 Concepts/NREC, User’s Guide to AXIALTM, Version 7.4, 2001. 3.5 Wang Y., Guenette G.R., Hejzlar P., and Driscoll M.J., “Aerodynamic Design of Turbomachinery for 300 MWe Supercritical Carbon Dioxide Brayton Power Conversion System”, MIT-GFR-022, Topical Report, Department of Nuclear Science and Engineering, MIT, March 2005. 3.6 Cumpsty, N.A., Compressor Aerodynamics, Krieger Publishing Company, 2004 23PDF Image | Radial Compressor Options for Supercritical CO2 Power Conversion Cycles
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