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3 2.5 2 1.5 1 100% 90% 80% 70% 60% 0 500 1000 1500 2000 Mass Flow Rate (kg/s) 0.9 0.88 0.86 0.84 0.82 0.8 0.78 0.76 100% 90% 80% 70% 60% 0 500 1000 1500 2000 Mass Flow Rate (kg/s) Figure 3.7: A single-stage main compressor map from CCODS showing unusual features. The pressure ratio (top) shows that surge occurs at the same mass flow rate regardless of speed and the design point does not appear at all. The design point is 3600 RPM and 1580.9 kg/s. Speeds are in percent of design speed Also, the off-design code was not self-consistent if the speeds for the compressor map were changed by the user. The source of this error was never discovered. Evidently, there were some data being preserved as calculations proceeded from one compressor speed to the next, but the complexity of the code made it impossible to diagnose the problem. CCDS and CCODS develop a compressor design based on some methods which were not advantageous because of inconsistencies in the results and difficulties involved in using the code for power producing S-CO2 cycles. First, CCDS develops a compressor design based on an input value of specific speed. The choice of specific speed as an input unnecessarily complicates the code when it is used for compressors in electricity production. Presumably the choice of input specific speed was made because specific speed is used to characterize compressors based on their application. The code used the input value of specific speed to calculate a value for 53 Total-to-Static Efficiency Total-to-Static Pressure RatioPDF Image | Supercritical Carbon Dioxide Cycle Analysis
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