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CHAetal., DevelopmentofaSupercriticalCO2BraytonEnergyConversionSystemCoupledwithaSodiumCooledFastReactor Table 5. Design Parameter of Compressor 1 Compressor 1 Stage [ea] Rotation [rpm] Mass Flow Rate [kg/s] Pin [MPa] Tin [oC] Pout [MPa] 2 3600 5730 7.40 31.3 20.0 1st stage [m][deg] Inlet tip diameter Inlet hub diameter Out diameter Outlet width Blade number Axial length 0.72 0.1 1.28 0.21 18 0.7 Inlet tip angle Inlet hub angle Outlet blade angle Diffuser diameter Clearance 63 52 75.5 1.68 0.004 2nd stage [m][deg] Inlet tip diameter Inlet hub diameter Out diameter Outlet width Blade number Axial length 0.68 0.1 1.26 0.20 17 0.65 Inlet tip angle Inlet hub angle Outlet blade angle Diffuser diameter Clearance 72 55 76 1.2 0.003 Table 6. Design Parameter of Compressor 2 Compressor 1 Stage [ea] Rotation [rpm] Mass Flow Rate [kg/s] Pin [MPa] Tin [oC] Pout [MPa] 3 3600 2342.22 7.46 91.2 20.0 1st stage [m][deg] Inlet tip diameter Inlet hub diameter Out diameter Outlet width Blade number Axial length 0.47 0.08 1.39 0.14 13 0.48 Inlet tip angle Inlet hub angle Outlet blade angle Diffuser diameter Clearance 53 41 55 1.313 0.004 2nd stage [m][deg] Inlet tip diameter Inlet hub diameter Out diameter Outlet width Blade number Axial length 0.46 0.08 1.31 0.13 13 0.44 Inlet tip angle Inlet hub angle Outlet blade angle Diffuser diameter Clearance 58 45 57 1.213 0.004 3rd stage [m][deg] Inlet tip diameter Inlet hub diameter Out diameter Outlet width Blade number Axial length 0.435 0.08 1.21 0.12 13 0.42 Inlet tip angle Inlet hub angle Outlet blade angle Diffuser diameter Clearance 61 48 57.5 1.11 0.004 was conducted with the COMP1D code on the basis of the loss model described in Table 4. One-dimensional design data were also calculated with the help of the COMP1D code, which was developed to determine compressor configuration parameters at the 100% nominal point. Table 5 and Table 6 are the design data of compressor 1 and compressor 2, respectively. Using these data, three-dimensional compressor configurations could be generated before the CFD analysis. More details on the one-dimensional design code, COMP1D, are found in reference [12]. Figure 4 shows the characteristics of the off-design performance of compressor 1 in the range of 50%~130% of the mass flow rate of 5734.41 kg/s, and in the range of 40%~120% of the rotational speed of 3600 rpm at the operating point. For the analysis, the inlet condition and the outlet condition were given as Pinlet=7.4 MPa, Tinlet=31.3 oC and Poutlet=20 MPa, respectively. The characteristic curves in the figure show the maximum efficiency at the design point and the pressure ratio 2.7 as a design requirement. Using the COMP1D code, performance analysis was also conducted for compressor 2 with the same method. Figure 5 shows the characteristics of the off-design point of compressor 2 at the condition of a mass flow rate of 2342.22 kg/s and a rotational speed of 3600 rpm at the operating point. For the analysis of compressor 2, the inlet condition and the outlet condition were given as Pinlet=7.46 MPa, Tinlet=91.2 oC and Poutlet=20 MPa, respectively. It is estimated that the difference of the efficiency characteristics originates from the different operation NUCLEAR ENGINEERING AND TECHNOLOGY, VOL.41 NO.8 OCTOBER 2009 1031PDF Image | DEVELOPMENT OF A SUPERCRITICAL CO2 BRAYTON ENERGY
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