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7.2 Recommendations The principal recommendation for future work is that a radial compressor of about 100 kW rating be procured from an experienced commercial vendor, and tested to obtain performance maps in the near-critical region for CO2. The goal at this scale should be to meet or beat 80% total-to-total efficiency. As noted earlier, the state-of-the-art, as embodied in published methods, does not yet permit high confidence in a strategy which is based only on analytical/ numerical methods. Considerable expertise is still closely held as commercially proprietary information. It should also be recognized that a certain amount of trial-and-error may be involved, such that the device should readily accommodate changing-out impellers. It is also recommended that, in anticipation of the development of further supporting information, the reference design main compressor for the 300 MWe PCS be a one-stage radial machine. While not expected to be required, substitution of an axial machine should be possible even at a very late date. For example, Frutschi [Ref. 7.1] notes that the second generation of Escher Wyss air-working-fluid Brayton units were, in the early 1960’s, originally designed and built using radial compressors because of their reduced size and cost. However, because of lower-than-planned efficiency, their lead-plant Coburg and Haus Aden 6MW units were, after initial tests, changed over to axial units. While radial compressor design and efficiency still lags that of axial machines, the progress over the past 45 years should be sufficient to preclude surprises of this sort: see Fig. 2.3 of Chapter 2. Finally, more work is needed on dynamic simulation of the power conversion system under transient and accident conditions. For this, realistic off-normal performance maps of high quality are needed for all turbomachinery components. This in general requires acquisition of experimental data rather than reliance on only analytical/numerical studies. 7.3 References for Chapter 7 7.1 H.V. Frutschi, “Closed Cycle Gas Turbines: Operating Experience and Future Potential”, ASME Press, 2005. 7.2 J. Kurzke, C. Riegler, “A New Compressor Map Scaling Procedure for Preliminary Conceptual Design of Gas Turbines,” Proc. of ASME IGTI TurboExpo 2000, Munich, May 2000: ASME 2000 GT-0006. 7.3 S.K. Roberts, S.A. Sjolander, “Effect of the Specific Heat Ratio on the Aerodynamic Performance of Turbomachinery,” ASME Journal of Engineering for Gas Turbine and Power, Vol. 127, p. 773, Oct. 2005. 39PDF Image | Radial Compressor Options for Supercritical CO2 Power Conversion Cycles
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