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The configuration of the recompression compressor is proposed to be axial stages followed by a radial stage. The arrangement is the same as for most other compressors which mix axial and radial stages. The arrangement is four axial stages followed by one radial stage. The key characteristics of the radial stage are shown in Table 6.3. Table 6.3 Mass Flow [kg/s] 1331 Design of the Radial stage for the Recompression Compressor Pressure Ratio 1.43 Efficiency 0.87 Specific Speed 0.47 Rotor tip diameter [m] 0.88 The geometries of the four axial stages are the same as the front half of the 8-stage axial design. The overall compressor efficiency is 0.908. 6.3 Conclusions and Recommendations The use of compressors having both radial and axial stages is an interesting option, which is worth future reconsideration depending on the outcome of cycle control and dynamics studies, and the results of small scale test facility operations. For example, hybrid machines may be more compatible with purely axial turbines and/or axial recompressing compressors under off-design conditions. While machine efficiencies close to those of all-axial compressors can be attained, the overall power cycle efficiency is less sensitive to compressor efficiency than to turbine efficiency. The compressor diameter is smaller than that of single-stage radial machines, but less significantly smaller than two- stage all-radial compressors. Hence, at present, hybrids rank behind their more-rugged, wider-operating range, all-radial counterparts. 6.4 References for Chapter 6 6.1 Y. Wang, G.R. Guenette, P. Hejzlar, M.J. Driscoll, “Supercritical CO2 Turbine and Compressor Design,” MIT-GFR-015, June 2004. 37PDF Image | Analysis of Radial Compressor Options for Supercritical CO2 Power
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