2019•The Proceedings of the International Conference on Nuclear Engineering (ICONE)Open access
INVESTIGATION ON DESIGN AND ANALYSIS OF S-CO2 TURBOMACHINERY
Yuandong Zhang, Minjun Peng, Genglei Xia, Songsheng Tang, Ge Wang, Cheng Zhou
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Abstract
Supercritical carbon dioxide (S-CO2) Brayton cycle has good prospects in generation IV reactors due to its potentially high efficiency and compactness, in which turbine and compressor are the key components. Compared with the traditional working fluids turbines and compressors, the non-ideal variations of S-CO2 thermophysical properties make the turbomachinery smaller and more complicated, which increases the difficulties in devices design and analysis. Grasping the performance of S-CO2 turbomachinery is beneficial to Brayton circulatory optimization and operational safety. In this paper, a code for the design and analysis of S-CO2 turbomachinery was developed. The validations were performed by experimental data to verify the accuracy of the calculation models selected in the code. A comprehensive investigation was carried out to research the performances of S-CO2 turbomachinery. The effects of temperature, pressure, mass flow rate and shaft rotational speed on turbomachinery in off-design conditions were studied. An optimization methodology of S-CO2 turbomachinery design was suggested based on the impacts of structural sizes, and the results showed that the efficiency of compressor increased by 1.99%.