Modelica is an open-source object-oriented language for modeling large and complex systems,and developed by the Swedish non-profit organization Modelica Association.In this paper,Modelica language is used to simulate the thermodynamic characteristics of supercritical carbon dioxide Brayton cycle system.Based on the mechanism relationship of key equipment such as compressor,turbine,regenerator and cooler,a supercritical carbon dioxide model library based on Modelica language was developed.A simulation model of single-stage regenerative cycle system was built based on drag and drop modeling and visual interface.The steady-state solution was carried out based on the solver of Modelica platform Mworks.Compared with the calculation results of SCTRAN/CO2,the reliability of Modelica model and the feasibility of Modelica in the simulation of thermodynamic characteristics of supercritical carbon dioxide Brayton cycle system were verified,and the transient characteristics of single-stage regenerative cycle were analyzed.
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