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CHAetal., DevelopmentofaSupercriticalCO2BraytonEnergyConversionSystemCoupledwithaSodiumCooledFastReactor Fig. 7. Sensitivity Analysis of the S-CO2 Turbine Efficiency for the Stage Number and Hub Diameter Fig. 8. Sensitivity Analysis of the S-CO2 Turbine Blade Angle for the Stage Number and Hub Diameter Table 8. Three-dimensional Design Parameters of the KALIMER-600 S-CO2 Turbine for the CFD Analysis Parameters First stage Stator Rotor Hub radius [cm] 53 Shroud radius [cm] 69~70 70~71 Chord radius [cm] 7.2 Blade angle [o] 60~67 Second stage Stator Rotor Hub radius [cm] 55 Shroud radius [cm] 72.5~73.5 73.5~74.5 Chord radius [cm] 7.8 Blade angle [o] 60~67 Third stage Stator Rotor Hub radius [cm] 57 Shroud radius [cm] 76~77 77~78 Chord radius [cm] 8.4 Blade angle [o] 60~67 Fourth stage Stator Rotor Hub radius [cm] 59 Shroud radius [cm] 79.5~80.5 80.5~81.5 Chord radius [cm] 9 Blade angle [o] 60~67 Number of blades [#] 40 number and the hub diameter of the turbine. The blade angle was increased linearly with the stage number and the hub diameter. Compared with the STAR-LM blade angle of ANL [5,8,15,16], the value is large, at approximately 10~20 degrees, which is estimated from the difference of the flow rate. For a change of the blade angle, the efficiency should be checked to find an optimum combination for the stage number and the hub diameter. Since the blade exit angle was dependent on the loss model in the current method, the Soderberg loss model needs to be modified to reduce the uncertainty of the conceptual design of the turbine. 3.3 Flow Analysis Supercritical CO2 Turbine and Compressor The off-design performance of the KALIMER-600 S-CO2 turbine was also estimated with three-dimensional CFD analysis. The commercial ANSYS CFX-11 code was used to conduct the flow analysis of the S-CO2 turbine. For the CFD analysis, the properties of the supercritical CO2 were calculated on the basis of the NIST property program and were then inserted in the CFX solver as the RGP(Real Gas Property) table. The basic design parameters and detailed information on the shape of the turbine in the KALIMER-600 are presented in Table 8. Three dimensional configuration of the S-CO2 turbine was generated by ANSYS BladeGenTM as shown in Figure 9. The boundary conditions consisted of the S-CO2 Brayton cycle energy conversion system for the KALIMER-600, as presented in Table 9. From the CFD analysis, the efficiency of the turbine NUCLEAR ENGINEERING AND TECHNOLOGY, VOL.41 NO.8 OCTOBER 2009 1033PDF Image | DEVELOPMENT OF A SUPERCRITICAL CO2 BRAYTON ENERGY CONVERSION
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