基于Modelica的超临界二氧化碳布雷顿循环系统热力学特性模拟

Simulation of Thermodynamic Characteristics of Supercritical Carbon Dioxide Brayton Cycle System Based on Modelica

Modelica是一种大型复杂系统建模的开源式面向对象语言,由瑞典的非盈利组织Modelica协会开发。本文对Modelica语言用于超临界二氧化碳布雷顿循环系统热力学特性仿真进行了探索。基于压缩机、透平、回热器和冷却器等关键设备的机理关系式,开发了基于Modelica语言的超临界二氧化碳模型库,基于可视化界面拖拽式建模构建了单级回热循环系统仿真模型,基于Modelica语言构建的平台Mworks的求解器进行了稳态求解。通过与SCTRAN/CO_(2)计算结果对比,验证了Modelica模型的可靠性和Modelica语言用于超临界二氧化碳布雷顿循环系统热力学特性仿真的可行性,分析了单级回热循环的瞬态特性。

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/CO_(2),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.