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TABLE 2. The test data of type-A at maximum efficiency Inlet pressure 0.923 MPa Inlet temperature 71.5 K Outlet pressure 0.515 MPa Outlet temperature 60.7 K Flow rate 0.128 kg/sec Rotational speed 1414 rev/sec Efficiency 69.7 % 80 70 60 50 40 0.4 0.5 0.6 0.7 0.8 U/C0 (-) FIGURE 6. The comparison of measured and predicted turbine efficiencies for two turbine impellers type-B. It was confirmed that the throat area of type-A had enough area for higher turbine efficiency. On the other hand, the solid and broken lines show the predicted efficiency curve calculated by the simulation program. As for U/C0, only U is changed, but the same C0 as turbine design value in TABLE 1 is used. Both of predicted efficiencies are in good agreement with the measured efficiencies. But some measured efficiencies in type-B are lower than predicted curve, because the pressure ratios and inlet temperatures of the turbine are rather different from the design values. We demonstrated the effectiveness of the neon turbine efficiency prediction in this performance test. CONCLUSION A cryogenic turbo-expander was made and tested in reverse-Brayton cycle refrigerator using neon as working fluid. We adopted active magnetic bearings and alternator for the turbine. Two types of turbine impellers were tested at the process pressure of 1 MPa ~ 0.5 MPa. The turbine maximum efficiency was about 70 % at the inlet temperature of 71 K, rotational speed of 1414 rev/sec. Measured turbine efficiencies agreed well with predicted efficiencies. Applying these test results to turbine design allows us to improve the turbine efficiency during the next developmental stage. Target efficiency Type-A measured Type-B measured Type-A predicted Type-B predicted 901 Turbine efficiency (%)PDF Image | NEON CRYOGENIC TURBO-EXPANDER WITH MAGNETIC BEARINGS
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