Numerical Simulation Study on Influence of Equation of State on Internal Flow Field and Performance of S-CO_(2)Compressor  

作　　者：ZHANG Lei YANG Zhenyu SUN Enhui ZHANG Qian AN Guangyao YUAN Wei 

机构地区：[1]Hebei Key Laboratory of Low Carbon and High Efficiency Power Generation Technology,North China Electric Power University,Baoding,071003,China [2]School of Energy,Power&Mechanical Engineering,North China Electric Power University,Baoding,071028,China

出　　处：《Journal of Thermal Science》2024年第3期888-898,共11页热科学学报（英文版）

基　　金：supports of National Natural Science Foundation of China(Grant No.52076079,52206010);Natural Science Foundation of Hebei Province,China(Grant No.E2020502013);Fundamental Research Funds for the Central Universities,China(Grant No.2021MS079)。

摘　　要：The low power consumption of the near-critical compressor is the key factor for the high efficiency of supercritical CO_(2)Brayton cycle.In the numerical simulation of the compressor,the rapid changes in the thermophysical properties of the CO_(2)near the critical point make it difficult to capture the condensation phenomenon.This paper investigates the influence of fluid physical properties on the condensation phenomenon.Firstly,the differences in the physical properties of CO_(2)in the SRK EOS(equation of state),PR EOS,and SW EOS are compared.Then,the simulation of nozzles and compressors were carried out and discussed.Results show that the condensation positions predicted by the three EOSs are basically the same.Compared with SW EOS,the disparities between the maximum condensation mass fraction predicted by the PR and SRK EOSs is5.7%and 11.5%,and that of total pressure ratio is 0.3%and 3.8%,respectively.The results show that PR EOS can be considered for numerical simulation in engineering practice.Since its physical property calculation results are closer to the actual physical properties while the physical properties change more gently,it has considerable accuracy and numerical stability.

关 键 词：supercritical carbon dioxide equation of state centrifugal compressor numerical simulation CONDENSATION 

分 类 号：TK05[动力工程及工程热物理]