Abstract
The design and performance prediction models of centrifugal-flow compressor are developed for Supercritical Carbon Dioxide (S-CO2) closed Brayton cycle system. The accuracy of models are verified by the experimental data of Sandia laboratory. The performance of an S-CO2 compressor at different mass flow rates and speeds is analyzed with the performance prediction models. The influences of number of blades, inlet and outlet angle of blade on performance of the compressor are also analyzed. The results indicate the directions to improve the efficiency of the compressor under design conditions are reducing the number of blades and inlet angle of blade, while increasing outlet angle of blade for present compressor. The performance of present compressor on normal condition was optimized with the simulated annealing algorithm. Its calculated total isentropic efficiency is upped from 82.26% to 87.72% when the structural parameters was varied no more than 20%.
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