Preliminary Design of Turbomachinery for the Supercritical Carbon Dioxide Brayton Cycle coupled to the KALIMER-600

摘要

The supercritical CO_2 Brayton cycle has recently been suggested as an alternative power conversion system for a sodium fast reactor in view of its economical efficiency, and a avoidance of the sodium-water reaction. In order to ensure the S-CO_2 energy conversion cycle's efficiency, the efficiency of the turbomachinery is considered first as an important parameter as well as its size. Thus, one-dimensional codes for the turbomachinery have been developed continuously to design and to analyze their performance. For a compressor design, a one-dimensional design and analysis code was developed to determine the compressor configuration parameter near an operation point on the basis of the meanline analysis method and loss models. Using this code, a performance analysis of the S-CO_2 compressor was conducted for the KALIMER-600 S-CO_2 Brayton cycle. In the case of a turbine design, a sensitivity analysis for the performance parameters was conducted by using a one-dimensional code. For the complement of the codes, a three-dimensional flow analysis was conducted for the S-CO_2 turbine with the help of the commercial CFD code.