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CHAetal., DevelopmentofaSupercriticalCO2BraytonEnergyConversionSystemCoupledwithaSodiumCooledFastReactor Number of Stator and Rotor Grids [#] Hub to Shroud Distribution Parameter_ End Ratio [-] O-Grid_ End Ratio [-] O-Grid Distance Factor [-] Topology Total Number of Hexahedrons [#] Inlet Total Temperature [ K ] Inlet Total Pressure [MPa] Outlet Static Pressure [MPa] S-CO2 Properties Turbulence Model Fig. 9. Three Dimensional Shape of the S-CO2 Turbine for the KALIMER-600 Table 9. Information on the Grids and Boundary Conditions Grids Boundary Conditions 1,098,048 (137,256) 200 50 (200) 0.1 (inflation: 10) H-J-L Grid 1,020,096 (127,521) 787 20 7.6 NIST properties Shear Stress Transport reaches around 85 %; the mass flow reaches 8800 kg/s at the pressure ratio of 2.25 and maintains a constant value for the higher pressure ratio, as show Figure 10. These results are slightly different from the value in the one- dimensional design data which seems to come from the difference of fluid properties and loss models. The one- dimensional design code was developed based on the properties of compressed air, but the fluid of this system is compressed CO2. Figure 11 shows a configuration of turbomachinery for the KALIEMR-600 S-CO2 Brayton cycle energy conversion system. To evaluate the performance of the compressor, compressor 2 was analyzed by the ANSYS- CFX code, as shown in Figure 12, in which a change of the efficiency and pressure ratio were depicted with the mass flow rate. The efficiency of the compressor has a maximum value of 95% at the half of a design mass flow rate. This value deviates to some extent from the design value, which has a maximum efficiency of 87.5% at a design mass flow rate. 1034 NUCLEAR ENGINEERING AND TECHNOLOGY, VOL.41 NO.8 OCTOBER 2009PDF Image | DEVELOPMENT OF A SUPERCRITICAL CO2 BRAYTON ENERGY CONVERSION
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