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介绍了采用膨胀机的CO2 跨临界循环的系统流程及典型工况 ,详细分析了膨胀中经历的亚稳态过程的成因和机理 ,指出了气化滞后对系统的危害 ,并对相变膨胀过程中的成核现象进行了热力学分析。在此基础上 ,结合CO2 超临界膨胀过程的特点 ,阐明了气液相变介质中声速的确定方法 ,认为CO2 超临界膨胀过程可近似按照经典热力学的准静态理论进行分析 ,并指出了结论的理论依据
This paper introduces the system flow and typical working conditions of expander CO2 transcritical cycle. The causes and mechanism of the metastable process experienced during the expansion are analyzed in detail. The hazards of the gasification lag to the system are pointed out, and the phase change and expansion process In the nucleation phenomenon of thermodynamic analysis. On this basis, combined with the characteristics of the supercritical CO2 expansion process, the method to determine the sound velocity in the gas-liquid phase change medium is expounded. It is considered that the supercritical CO2 expansion process can be approximated according to the quasi-static theory of classical thermodynamics and the conclusion is drawn Theoretical basis