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1 0.9 0.8 0.7 0.6 0.5 0.4 120% 110% 100% 90% 80% 70% Mass Flow Rate (kg/s) Figure 3.15: The total-to-static efficiency of the two-stage recompressing compressor for varying speeds in percentage of the design speed (3600 RPM). The design point efficiencies of the recompression cycle designs were incorporated in cycle calculations in Chapter 2. Performance maps similar to these designs have been incorporated in the transient analysis of TSCYCO performed by Trinh [2009]. These compressors display many of the features of ideal gas compressors. They achieve their highest efficiencies at the design point. Pressure recovery in the vaned diffuser is usually achievable up to 0.80 at the design point and efficiencies are rather high overall. As speed increases, the compressor achieves the same peak efficiency, but at a higher mass flow rate. The surge line occurs prior to the flattening of the pressure ratio curves as mass flow rate is decreased. The flattening of the pressure ratio curve can be considered the definition of stall, but the early surge in these performance maps is believed to be indicative of the conservative assumptions in the code. 3.5.3 Benchmarking RGRC and RGRCMS Benchmarking RGRC is important to validate the code. Few compressors have operated close to the critical point and benchmarking is difficult given the lack of data. A test S-CO2 compression loop has been operated by Sandia National Laboratory close to the critical point. Some of its parameters are given in Table 3.3. 76 Total-to-Static EfficiencyPDF Image | Supercritical Carbon Dioxide Cycle Analysis
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