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Investigation on One-Dimensional Loss Models for Predicting Performance of Multistage Centrifugal Compressors in supercritical CO brayton cycle

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Journal of Thermal Science 2021年第1期30卷 133-148页

作者： SHAO Wenyang DU Juan YANG Jinguang WANG Xiaofang LYU Guochuan School of Energy and Power Engineering Dalian University of TechnologyDalian 116024China Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China

The main compressor in a supercritical carbon dioxide(SCO2)brayton cycle works near the critical point where the physical properties of CO_(2)are far away from the ideal *** investigate the effectiveness of the conventional one-dimensional(1D)loss models for predicting the performance of compressors working in such nontraditional conditions,detailed comparisons of 1D predicted performance,experimental data and threedimensional CFD results are made.A 1D analysis method with enthalpy and total pressure based loss system is developed for multistage SCO2 centrifugal compressors,and it is firstly validated against the experimental results of a single stage SCO2 centrifugal compressor from the Sandia National Laboratory.A good agreement of pressure ratios with experiments can be achieved by the 1D *** the efficiency deviations reveal the potential deficiencies of the parasitic loss *** the basis of the validation,a two-stage SCO2 centrifugal compressor is employed to do the ***-dimensional CFD simulations are *** comparisons are made between the CFD and the 1D results at different stations located in the *** features of the deviations are analyzed in detail,as well as the reasons that might cause these deviations.

关键词： supercritical carbon dioxide brayton cycle centrifugal compressor one-dimensional performance analysis loss model three-dimensional CFD simulation

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